Photodynamics on Metal Oxynitride Photocatalysts

• Project Area: Synthesis of Mixed Anion Compounds toward Novel Functionalities
• Project/Area Number: 17H05491
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Toyota Technological Institute
• Principal Investigator: 山方 啓 豊田工業大学, 工学(系)研究科(研究院), 准教授 (60321915)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 光触媒材料 / 欠陥準位 / 時間分解赤外分光 / キャリアーダイナミクス / 再結合速度 / トラップ / 可視光応答型光触媒 / 金属酸窒化物 / 時間分解分光測定 / 光励起キャリアー / 金属酸窒化物光触媒

Outline of Annual Research Achievements

近年、BiOClやBi4NbO8Clなどの酸ハロゲン化合物が新しい可視光応答型光触媒材料として注目されている。しかし、これらの材料は、塩素や酸素などのアニオンが抜けやすいことが問題である。一般にアニオン欠陥は、電子トラップ準位を形成させる。しかし、どのようなアニオン欠陥が、どのような深さの電子トラップ準位を形成するのか、系統的な理解はまだ十分に進んでいない。そこで本研究では、様々な酸ハロゲン化合物を光励起して、可視から中赤外域の過渡吸収測定を行うことで、これらの材料の欠陥準位を調べた。
Bi4NbO8Clに紫外光パルスを照射して過渡吸収スペクトルを測定したところ、23000~18000 cm-1と18000~7000 cm-1, <4000 cm-1に特徴的な3つの吸収バンドが観察された。これらはそれぞれ、トラップ正孔、トラップ電子、伝導帯中に存在する自由電子に帰属される。一方、BiOClの場合には25000~1000 cm-1に右肩下がりの単調な吸収だけが観察され、電子は深い欠陥準位にトラップされていることが分かった。つまり、BiOClはアニオン欠陥の生成によって深い電子トラップ準位が形成されるが、Bi4NbO8Clの場合、アニオン欠陥ができても深い電子トラップ準位は形成されにくいことを見いだした。
次に、第一原理計算を用いて、このメカニズムを調べた。その結果、O空孔による電子トラップ準位が異なるのは、ハロゲンを挟んだ[Bi2O2]のスタッキング構造の違いで説明できることが分かった。Bi4NbO8Clの場合、[Bi2O2]間のBi-6p軌道が混成し、[Bi2O2]層内に局在したCBMを構成する。つまり、アニオン欠陥ができても、深い電子トラップ準位ができにくいことが分かった。

Research Progress Status

平成30年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

平成30年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] National Chung Hsing University(台湾)
• [Int'l Joint Research] POSTECH(韓国)
• [Int'l Joint Research] MSU-IIT(フィリピン)
• [Int'l Joint Research] Technische Universitat Berlin(ドイツ)
• [Int'l Joint Research] POSTECH(韓国)
• [Int'l Joint Research] Mindanao State University(フィリピン)
• [Int'l Joint Research] 中興大学(台湾)
• [Journal Article] Defect-Induced Acceleration and Deceleration of Photocarrier Recombination in SrTiO3 Powders (2020)
  • Author(s): Kosaku Kato and Akira Yamakata
  • Journal Title: Journal of Physical Chemistry C Volume: 124 Issue: 20 Pages: 11057-11063
  • DOI: 10.1021/acs.jpcc.0c03369
  • Peer Reviewed
• [Journal Article] Activation of a Pt-loaded Pb2Ti2O5.4F1.2 photocatalyst by alkaline chloride treatment for improved H2 evolution under visible light (2020)
  • Author(s): Haruki Wakayama, Kosaku Kato, Kodai Kashihara, Tomoki Uchiyama, Akinobu Miyoshi, Hiroko Nakata, Daling Lu, Kengo Oka, Akira Yamakata, Yoshiharu Uchimoto and Kazuhiko Maeda
  • Journal Title: Journal of Materials Chemistry A Volume: - Issue: 18 Pages: 9099-9108
  • DOI: 10.1039/d0ta02883e
  • Peer Reviewed
• [Journal Article] Cobalt Aluminate Spinel as a Cocatalyst for Photocatalytic Oxidation of Water: Significant Hole-Trapping Effect (2020)
  • Author(s): Kanazawa Tomoki、Kato Kosaku、Yamaguchi Ryusei、Uchiyama Tomoki、Lu Daling、Nozawa Shunsuke、Yamakata Akira、Uchimoto Yoshiharu、Maeda Kazuhiko
  • Journal Title: ACS Catalysis Volume: 10 Issue: 9 Pages: 4960-4966
  • DOI: 10.1021/acscatal.0c00944
  • Peer Reviewed / Open Access
• [Journal Article] Efficient photocatalytic hydrogen evolution on single-crystalline metal selenide particles with suitable cocatalysts (2020)
  • Author(s): Chen Shanshan, Vequizo Junie Jhon M., Hisatomi Takashi, Nakabayashi Mamiko, Lin Lihua, Wang Zheng, Yamakata Akira, Shibata Naoya, Takata Tsuyoshi, Yamada Taro, Domen Kazunari
  • Journal Title: Chemical Science Volume: - Issue: 25 Pages: 6436-6441
  • DOI: 10.1039/d0sc01167c
  • Peer Reviewed / Open Access
• [Journal Article] Synthesis of Three-component C3N4/rGO/C-TiO2 Photocatalyst with Enhanced Visible-light Responsive Photocatalytic deNOx Activity (2020)
  • Author(s): C.Noda, Y. Asakura, K. Shiraki, A.Yamagata, and S.Yin
  • Journal Title: Chem.Eng. J. Volume: 390 Pages: 124616-124616
  • DOI: 10.1016/j.cej.2020.124616
  • Peer Reviewed
• [Journal Article] 時間分解分光測定による粉末欠陥への光励起キャリアー捕捉過程と光触媒活性に及ぼす影響 (2020)
  • Author(s): 山方啓、Vequizo Junie Jhon M.
  • Journal Title: 触媒 【特集号: 触媒設計を拓く欠陥構造のキャラクタリゼーション】 Volume: 62 Pages: 22-28
• [Journal Article] Synthesis of Copolymerized Carbon Nitride Nanosheets from Urea and 2‐Aminobenzonitrile for Enhanced Visible Light CO2 Reduction with a Ruthenium(II) Complex Catalyst (2020)
  • Author(s): Kengo Shibata, Kosaku Kato, Constantine Tsounis, Tomoki Kanazawa, Daling Lu, Shunsuke Nozawa, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda
  • Journal Title: Solar RRL Volume: 4 Issue: 8 Pages: 1900461-1900461
  • DOI: 10.1002/solr.201900461
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] How g-C3N4 Works and Is Different from TiO2 as an Environmental Photocatalyst: Mechanistic View (2020)
  • Author(s): Lim Jonghun、Kim Hyejin、Park Jihee、Moon Gun-Hee、Vequizo Junie Jhon M.、Yamakata Akira、Lee Jinwoo、Choi Wonyong
  • Journal Title: Environmental Science & Technology Volume: 54 Issue: 1 Pages: 497-506
  • DOI: 10.1021/acs.est.9b05044
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Enhancement of UV-responsive photocatalysts aided by visible-light responsive photocatalysts: Role of WO3 for H2 evolution on CuCl (2020)
  • Author(s): Takagi Masaki、Kawaguchi Masayuki、Yamakata Akira
  • Journal Title: Applied Catalysis B: Environmental Volume: 263 Pages: 118333-118333
  • DOI: 10.1016/j.apcatb.2019.118333
  • Peer Reviewed
• [Journal Article] Identification of Individual Electron- and Hole-Transfer Kinetics at CoOx/BiVO4/SnO2 Double Heterojunctions (2019)
  • Author(s): Yamakata Akira、Ranasinghe Chandana Sampath Kumara、Hayashi Naruki、Kato Kosaku、Vequizo Junie Jhon M.
  • Journal Title: ACS Applied Energy Materials Volume: 3 Issue: 1 Pages: 1207-1214
  • DOI: 10.1021/acsaem.9b02262
  • Peer Reviewed
• [Journal Article] Fe/Ru Oxide as Versatile and Effective Cocatalyst for Boosting Z-Scheme Water Splitting: Suppressing Undesirable Backward Electron Transfer (2019)
  • Author(s): Akinobu Nakada, Hajime Suzuki, Junie Jhon M. Vequizo, Masanobu Higashi, Akinori Saeki, Akira Yamakata, Hiroshi Kageyama, and Ryu Abe
  • Journal Title: ACS Appl. Mater. Interfaces Volume: 11 Issue: 49 Pages: 45606-45611
  • DOI: 10.1021/acsami.9b14802
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Crucial impact of reduction on the photocarriers dynamics on SrTiO3 powders studied by transient absorption spectroscopy (2019)
  • Author(s): Junie Jhon M. Vequizo, Shunta Nishioka, Junji Hyodo, Yoshihiro Yamazaki, Kazuhiko Maeda, Akira Yamakata
  • Journal Title: J. Mater. Chem. A Volume: 7 Issue: 45 Pages: 26139-26146
  • DOI: 10.1039/c9ta08216f
  • Peer Reviewed
• [Journal Article] Effect of Na‐Doping on Electron Decay Kinetics in SrTiO3 Photocatalyst (2019)
  • Author(s): Kato Kosaku、Jiang Junzhe、Sakata Yoshihisa、Yamakata Akira
  • Journal Title: ChemCatChem Volume: 11 Issue: 24 Pages: 6349-6354
  • DOI: 10.1002/cctc.201901669
  • Peer Reviewed
• [Journal Article] Achievement of High Photocatalytic Performance to BaTi4O9 Toward Overall H2O Splitting (2019)
  • Author(s): Hiramachi Yuichi、Fujimori Hirotaka、Yamakata Akira、Sakata Yoshihisa
  • Journal Title: ChemCatChem Volume: 11 Issue: 24 Pages: 6213-6217
  • DOI: 10.1002/cctc.201901564
  • Peer Reviewed
• [Journal Article] Solar-Driven Photoelectrochemical Water Oxidation over an n-Type Lead Titanium Oxyfluoride Anode (2019)
  • Author(s): N. Hirayama, H. Nakata, H. Wakayama, S. Nishioka, T. Kanazawa, R. Kamata, Y. Ebato, K. Kato, H. Kumagai, A. Yamakata, K. Oka, and K. Maeda
  • Journal Title: Journal of the American Chemical Society Volume: 141 Issue: 43 Pages: 17158-17165
  • DOI: 10.1021/jacs.9b06570
  • Peer Reviewed
• [Journal Article] Oxygen-doped Ta3N5 nanoparticles for enhanced Z-scheme CO2 reduction with binuclear Ru(II) complex under visible light (2019)
  • Author(s): Kanemichi Muraoka, Junie Jhon M. Vequizo, Ryo Kuriki, Akira Yamakata, Tomoki Uchiyama, Daling Lu, Yoshiharu Uchimoto, Osamu Ishitani, Kazuhiko Maeda
  • Journal Title: ChemPhotoChem Volume: 3 Issue: 10 Pages: 1027-1033
  • DOI: 10.1002/cptc.201900120
  • Peer Reviewed
• [Journal Article] Enhanced water splitting through two-step photoexcitation by sunlight using tantalum/nitrogen-codoped rutile titania as a water oxidation photocatalyst (2019)
  • Author(s): S. Nishioka, K. Yanagisawa, D. Lu, J.J.M. Vequizo, A. Yamakata, K. Kimoto, M. Inada, K. Maeda
  • Journal Title: Sustainable Energy & Fuels Volume: 3 Issue: 9 Pages: 2337-2346
  • DOI: 10.1039/c9se00289h
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Construction of Spatial Charge Separation Facets on BaTaO2N Crystals by Flux Growth Approach for Visible-Light-Driven H2 Production (2019)
  • Author(s): Luo Ying、Suzuki Sayaka、Wang Zheng、Yubuta Kunio、Vequizo Junie Jhon M.、Yamakata Akira、Shiiba Hiromasa、Hisatomi Takashi、Domen Kazunari、Teshima Katsuya
  • Journal Title: ACS Applied Materials & Interfaces Volume: 11 Issue: 25 Pages: 22264-22271
  • DOI: 10.1021/acsami.9b03747
  • Peer Reviewed
• [Journal Article] Enhanced Visible Light Response of TiO2 Codoped with Cr and Ta Photocatalysts by Electron Doping (2019)
  • Author(s): Amano Fumiaki、Nakata Masashi、Vequizo Junie Jhon M.、Yamakata Akira
  • Journal Title: ACS Applied Energy Materials Volume: 2 Issue: 5 Pages: 3274-3282
  • DOI: 10.1021/acsaem.9b00126
  • Peer Reviewed
• [Journal Article] Effect of CuFe2O4 ferrite on photocatalysis and carrier dynamics of electrospun α-Fe2O3 nanofibers by time-resolved transient absorption spectroscopy (2019)
  • Author(s): Hung Pei-Hsuan、Vequizo Junie Jhon M.、Wu Ren-An、Yamakata Akira、Tseng Wenjea J.
  • Journal Title: Ceramics International Volume: － Issue: 12 Pages: 15676-15680
  • DOI: 10.1016/j.ceramint.2019.05.080
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Improvement of photocatalytic activity under visible-light irradiation by heterojunction of Cu ion loaded WO3 and Cu ion loaded N-TiO2 (2019)
  • Author(s): Iihoshi Tomoya、Ohwaki Takeshi、Vequizo Junie Jhon M.、Yamakata Akira
  • Journal Title: Applied Catalysis B: Environmental Volume: 248 Pages: 249-254
  • DOI: 10.1016/j.apcatb.2019.01.046
  • Peer Reviewed
• [Journal Article] Clear and transparent nanocrystals for infrared-responsive carrier transfer (2019)
  • Author(s): Sakamoto Masanori、Kawawaki Tokuhisa、Kimura Masato、Vequizo Junie Jhon M.、Matsunaga Hironori、Ranasinghe Chandana Sampath Kumara、Yamakata Akira、Matsuzaki Hiroyuki、Furube Akihiro、Teranishi Toshiharu
  • Journal Title: Nature Communications Volume: 10 Issue: 1 Pages: 406-406
  • DOI: 10.1038/s41467-018-08226-2
  • NAID: 120006554836
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sodium titanium oxide bronze nanoparticles synthesized via concurrent reduction and Na+-doping into TiO2(B) (2019)
  • Author(s): George Hasegawa,* Moeko Tanaka, Junie Jhon M. Vequizo, Akira Yamakata, Hajime Hojo, Makoto Kobayashi, Masato Kakihana, Miki Inada, Hirofumi Akamatsu, Katsuro Hayashi*
  • Journal Title: Nanoscale Volume: in press Issue: 3 Pages: 1442-1450
  • DOI: 10.1039/c8nr08372j
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Curious behaviors of photogenerated electrons and holes at the defects on anatase, rutile, and brookite TiO2 powders: A review (2018)
  • Author(s): Yamakata Akira、Vequizo Junie Jhon M.
  • Journal Title: Journal of Photochemistry and Photobiology C: Photochemistry Reviews Volume: － Pages: 234-243
  • DOI: 10.1016/j.jphotochemrev.2018.12.001
  • Peer Reviewed
• [Journal Article] Plasmonic p-n Junction for Infrared Light to Chemical Energy Conversion (2018)
  • Author(s): Lian Zichao, Sakamoto Masanori, Vequizo Junie J. M., Ranasinghe C. S. Kumara, Yamakata Akira, Nagai Takuro, Kimoto Koji, Kobayashi Yoichi, Tamai Naoto, Teranishi Toshiharu
  • Journal Title: Journal of the American Chemical Society Volume: 141 Issue: 6 Pages: 2446-2450
  • DOI: 10.1021/jacs.8b11544
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Enhanced Photocatalytic NOx Decomposition of Visible-light Responsive F-TiO2/(N,C)-TiO2 by Charge Transfer Between F-TiO2 and (N,C)-TiO2 through their Doping Levels (2018)
  • Author(s): S. KOMATSUDA, Y. ASAKURA, J. J. M. VEQUIZO, A. YAMAKATA, S. YIN
  • Journal Title: Appl. Catal. B: Environ. Volume: 238 Pages: 358-364
  • DOI: 10.1016/j.apcatb.2018.07.038
  • Peer Reviewed
• [Journal Article] Expansion of the photoresponse window of a BiVO4 photocatalyst by doping with chromium(vi) (2018)
  • Author(s): Okuno Kazuya、Kato Hideki、Vequizo Junie Jhon M.、Yamakata Akira、Kobayashi Hisayoshi、Kobayashi Makoto、Kakihana Masato
  • Journal Title: RSC Advances Volume: 8 Issue: 67 Pages: 38140-38145
  • DOI: 10.1039/c8ra07830k
  • Peer Reviewed / Open Access
• [Journal Article] A Copolymerization Approach to Improving Ru(II)-Complex/C3N4 Hybrid Photocatalysts for Visible-Light CO2 Reduction (2018)
  • Author(s): Constantine Tsounis, Ryo Kuriki, Kengo Shibata, Junie Jhon M. Vequizo, Daling Lu, Akira Yamakata, Osamu Ishitani, Rose Amal, Kazuhiko Maeda
  • Journal Title: ACS Sustainable Chem. Eng. Volume: 6 Issue: 11 Pages: 15333-15340
  • DOI: 10.1021/acssuschemeng.8b03782
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Effects of Interfacial Electron Transfer in Metal Complex - Semiconductor Hybrid Photocatalysts on Z-scheme CO2 Reduction under Visible Light (2018)
  • Author(s): Akinobu Nakada, Ryo Kuriki, Keita Sekizawa, Shunta Nishioka, Junie Jhon M. Vequizo, Tomoki Uchiyama, Nozomi Kawakami, Daling Lu, Akira Yamakata, Yoshiharu Uchimoto, Osamu Ishitani, Kazuhiko Maeda
  • Journal Title: ACS Catal. Volume: 8 Issue: 10 Pages: 9744-9754
  • DOI: 10.1021/acscatal.8b03062
  • Peer Reviewed
• [Journal Article] Binary flux-promoted formation of trigonal ZnIn2S4 layered crystals using ZnS-containing industrial waste and their photocatalytic performance for H2 production (2018)
  • Author(s): Hojamberdiev Mirabbos、Cai Yanfei、Vequizo Junie Jhon M.、Khan Mohammad Mansoob、Vargas Ronald、Yubuta Kunio、Yamakata Akira、Teshima Katsuya、Hasegawa Masashi
  • Journal Title: Green Chemistry Volume: 20 Issue: 16 Pages: 3845-3856
  • DOI: 10.1039/c8gc01746h
  • Peer Reviewed
• [Journal Article] Excited-State Dynamics of Graphitic Carbon Nitride Photocatalyst and Ultrafast Electron Injection to a Ru(II) Mononuclear Complex for Carbon Dioxide Reduction (2018)
  • Author(s): Ryo Kuriki, Chandana Sampath Kumara Ranasinghe, Yasuomi Yamazaki, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda
  • Journal Title: J. Phys. Chem. C Volume: 122 Issue: 29 Pages: 16795-16802
  • DOI: 10.1021/acs.jpcc.8b03996
  • Peer Reviewed
• [Journal Article] Homogeneous Electron Doping into Nonstoichiometric Strontium Titanate Improves Its Photocatalytic Activity for Hydrogen and Oxygen Evolution (2018)
  • Author(s): Nishioka Shunta、Hyodo Junji、Vequizo Junie Jhon M.、Yamashita Shunsuke、Kumagai Hiromu、Kimoto Koji、Yamakata Akira、Yamazaki Yoshihiro、Maeda Kazuhiko
  • Journal Title: ACS Catalysis Volume: 8 Issue: 8 Pages: 7190-7200
  • DOI: 10.1021/acscatal.8b01379
  • Peer Reviewed
• [Journal Article] Near Infrared Light Induced Plasmonic Hot Hole Transfer at a Nano-Heterointerface (2018)
  • Author(s): Z. Lian M. Sakamoto H. Matsunaga J. J. M. Vequizo A. Yamakata M. Haruta H. Kurata W. Ota T. Sato T. Teranishi
  • Journal Title: Nat. Commun. Volume: 9 Issue: 1 Pages: 23141-7
  • DOI: 10.1038/s41467-018-04630-w
  • NAID: 120006488580
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Nitrogen/fluorine-codoped rutile titania as a stable oxygen-evolution photocatalyst for solar-driven Z-scheme water splitting (2018)
  • Author(s): Miyoshi Akinobu、Vequizo Junie Jhon?M.、Nishioka Shunta、Kato Yuma、Yamamoto Muneaki、Yamashita Shunsuke、Yokoi Toshiyuki、Iwase Akihide、Nozawa Shunsuke、Yamakata Akira、Yoshida Tomoko、Kimoto Koji、Kudo Akihiko、Maeda Kazuhiko
  • Journal Title: Sustainable Energy & Fuels Volume: 2 Issue: 9 Pages: 2025-2035
  • DOI: 10.1039/c8se00191j
  • Peer Reviewed
• [Journal Article] Undoped Layered Perovskite Oxynitride Li2LaTa2O6N for Photocatalytic CO2 Reduction with Visible Light (2018)
  • Author(s): Oshima, T.、 Ichibha, T、Qin K, S、Muraoka, K.、Vequizo, J. J. M.、Hibino, K.、Kuriki, R.、Yamashita, S.、Hongo, K.、Uchiyama, T.、Fujii, K.、Lu, D.、Maezono, R.、Yamakata, A.、Kato, H.、Kimoto, K.、Yashima, M.、Uchimoto, Y.、Kakihana, M.、Ishitani, O.、Kageyama, H.、Maeda, K.
  • Journal Title: Angewandte Chemie International Edition Volume: 57 Issue: 27 Pages: 8154-8158
  • DOI: 10.1002/anie.201803931
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Characterization of silver species on graphitic carbon nitride nanosheets as promoters for photocatalytic carbon dioxide reduction under visible light with a ruthenium(II) complex (2018)
  • Author(s): Kazuhiko Maeda, Daehyeon An, Chandana Sampath Kumara Ranasinghe, Tomoki Uchiyama, Ryo Kuriki, Tomoki Kanazawa, Daling Lu, Shunsuke Nozawa, Akira Yamakata, Yoshiharu Uchimoto, Osamu Ishitani
  • Journal Title: J. Mater. Chem. A Volume: 印刷中 Issue: 20 Pages: 9708-9715
  • DOI: 10.1039/c8ta03245a
  • Peer Reviewed
• [Journal Article] Structural Changes of Water Molecules during Photoelectrochemical Water Oxidation on TiO2 Thin Film Electrodes (2018)
  • Author(s): S. Chandana, R. Kumara, *A Yamakata
  • Journal Title: Physical Chemistry and Chemical Physics Volume: 20 Issue: 5 Pages: 3388-3394
  • DOI: 10.1039/c7cp06646e
  • Peer Reviewed
• [Journal Article] Oxygen induced enhancement of NIR emission in brookite TiO2 powders: comparison with rutile and anatase TiO2 powders (2018)
  • Author(s): Vequizo Junie Jhon M.、Kamimura Sunao、Ohno Teruhisa、Yamakata Akira
  • Journal Title: Physical Chemistry Chemical Physics Volume: 20 Issue: 5 Pages: 3241-3248
  • DOI: 10.1039/c7cp06975h
  • Peer Reviewed
• [Journal Article] Fabrication of robust TiO2 thin films by atomized spray pyrolysis deposition for photoelectrochemical water oxidation (2018)
  • Author(s): Ranasinghe Chandana Sampath Kumara、Vequizo Junie Jhon M.、Yamakata Akira
  • Journal Title: Journal of Photochemistry and Photobiology A: Chemistry Volume: 358 Pages: 320-326
  • DOI: 10.1016/j.jphotochem.2017.09.006
  • Peer Reviewed
• [Journal Article] Role of CoOx cocatalyst on Ta3N5 photocatalysts studied by transient visible to mid-infrared absorption spectroscopy (2018)
  • Author(s): Vequizo Junie Jhon M.、Hojamberdiev Mirabbos、Teshima Katsuya、Yamakata Akira
  • Journal Title: Journal of Photochemistry and Photobiology A: Chemistry Volume: 358 Pages: 315-319
  • DOI: 10.1016/j.jphotochem.2017.09.005
  • Peer Reviewed
• [Journal Article] Engaging the Flux-Grown La1-xSrxFe1-yTiyO3 Crystals in Visible-Light-Driven Photocatalytic Hydrogen Generation (2017)
  • Author(s): Hojamberdiev Mirabbos、Kawashima Kenta、Kumar Mahesh、Yamakata Akira、Yubuta Kunio、Gurlo Aleksander、Hasegawa Masashi、Domen Kazunari、Teshima Katsuya
  • Journal Title: International Journal of Hydrogen Energy Volume: 42 Issue: 44 Pages: 27024-27033
  • DOI: 10.1016/j.ijhydene.2017.09.036
  • Peer Reviewed
• [Journal Article] Elucidating the impact of A-site cation change on photocatalytic H2 and O2 evolution activities of perovskite-type LnTaON2 (Ln = La and Pr) (2017)
  • Author(s): Hojamberdiev Mirabbos、Bekheet Maged F.、Hart Judy N.、Vequizo Junie Jhon M.、Yamakata Akira、Yubuta Kunio、Gurlo Aleksander、Hasegawa Masashi、Domen Kazunari、Teshima Katsuya
  • Journal Title: Physical Chemistry Chemical Physics Volume: 19 Issue: 33 Pages: 22210-22220
  • DOI: 10.1039/c7cp03714g
  • Peer Reviewed
• [Journal Article] Interfacial Manipulation by Rutile TiO2 Nanoparticles to Boost CO2 Reduction into CO on a Metal-Complex/Semiconductor Hybrid Photocatalyst (2017)
  • Author(s): Keisuke Wada, Chandana Sampath Kumara Ranasinghe, Ryo Kuriki, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda
  • Journal Title: ACS Appl. Mater. Interfaces Volume: 9 Issue: 28 Pages: 23869-23877
  • DOI: 10.1021/acsami.7b07484
  • Peer Reviewed
• [Presentation] Naをドープしたチタン酸ストロンチウムの光励起キャリアダイナミクス (2020)
  • Author(s): 加藤康作, 山方啓
  • Organizer: 豊田工業大学 先進触媒開発研究センター 最終年度シンポジウム
• [Presentation] 高活性光触媒の光励起ダイナミクス (2020)
  • Author(s): 山方啓
  • Organizer: 豊田工業大学 先進触媒開発研究センター 最終年度シンポジウム
• [Presentation] WO3内励起キャリアの挙動の粒子サイズ依存性 (2020)
  • Author(s): 坪井翔哉, 山方啓
  • Organizer: 豊田工業大学 先進触媒開発研究センター 最終年度シンポジウム
• [Presentation] Pt担持TiO2におけるキャリアダイナミクス (2020)
  • Author(s): 白木恭平, 山方啓
  • Organizer: 豊田工業大学 先進触媒開発研究センター 最終年度シンポジウム
• [Presentation] 酸化チタン二層電極の表面修飾効果 (2020)
  • Author(s): 林成希, 山方啓
  • Organizer: 豊田工業大学 先進触媒開発研究センター 最終年度シンポジウム
• [Presentation] 半導体光触媒を用いた水の酸化反応を促進するCoAlOx複合酸化物助触媒の開発 (2020)
  • Author(s): 金澤知器, 内山智貴, 内本喜晴, 野澤俊介, 山方啓, 前田和彦
  • Organizer: 日本化学会第100春季年会
• [Presentation] Visible light Z-scheme water splitting using nitrogen/fluorine codoped rutile TiO2 as O2 evolution photocatalyst (2020)
  • Author(s): Akinobu Miyoshi, Junie Jhon M. Vequizo, Shunta Nishioka, Shunsuke Yamashita, Shunsuke Nozawa, Akihide Kuwabara, Akira Yamakata, Koji Kimoto, Kazuhiko Maeda
  • Organizer: 日本化学会第100春季年会
• [Presentation] 酸フッ化物Pb2Ti2O5.4F1.2へのアルカリ処理と光触媒活性への影響 (2020)
  • Author(s): 若山晴輝, 平山直樹, 中田博子, 加藤康作, 山方啓, 岡研吾, 前田和彦
  • Organizer: 日本化学会第100春季年会
• [Presentation] トンネル構造を有するチタン混合酸化物光触媒のH2O分解反応に対する特性 (2020)
  • Author(s): 海野優樹, 平町雄一, 藤森宏高, 山方啓, 酒多喜久
  • Organizer: 第125回触媒討論会
• [Presentation] Defects for the Enhancement of Photocatalytic Activity (2019)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo, Shouta Ishiyama, Taishi Hiramine, Yoshihisa Sakata
  • Organizer: International Conference on Photocatalysis and Photoenergy 2019 (ICoPP2019)
  • Int'l Joint Research / Invited
• [Presentation] Density Functional Studies of Electron Trapping Behaviors in Photocatalytic Materials (2019)
  • Author(s): Takafumi Ogawa, Akira Yamakata, Akihide Kuwabara
  • Organizer: The 6th International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC6)
  • Int'l Joint Research
• [Presentation] Trapping of Photogenerated Electrons at the Defects on Anatase and Rutile TiO2 (2019)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo, Hironori Matsunaga
  • Organizer: The 6th International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC6)
  • Int'l Joint Research
• [Presentation] 時間分解分光測定を利用した粉末光触媒のキャリアダイナミクス (2019)
  • Author(s): 山方啓
  • Organizer: 第38回光がかかわる触媒化学シンポジウム
• [Presentation] Behaviour of Photogenerated Charge Carriers at the Defects on Photocatalysts (2019)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo
  • Organizer: The First Symposium on Photo (electro) catalysis (SOP-1)
  • Int'l Joint Research / Invited
• [Presentation] Improvement of the photocatalytic property of BaTi4O9 to the overall H2O splitting (2019)
  • Author(s): Yuichi Hiramachi, Hirotaka Fujimori, Masaaki Yoshida, Akira Yamakata, Yoshihisa Sakata
  • Organizer: The 8th Asia Pacific Congress on Catalysis (APCAT-8)
  • Int'l Joint Research
• [Presentation] Preparation of High Active SrTiO3 to overall H2O splitting by doping Na ion (2019)
  • Author(s): Junzhe Jiang, Hirotaka Fujimori, Masaaki Yoshida, Akira Yamakata, Yoshihisa Sakata
  • Organizer: The 8th Asia Pacific Congress on Catalysis (APCAT-8)
  • Int'l Joint Research
• [Presentation] Mechanism of highly efficient Ga2O3 based photocatalysts studied by time-resolved absorption spectroscopy (2019)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo, Shouta Ishiyama, Taishi Hiramine, Yoshihisa Sakata
  • Organizer: The 8th Asia Pacific Congress on Catalysis (APCAT-8)
  • Int'l Joint Research
• [Presentation] Impurity Induced Enhancement of Photocatalytic Activity on Ga2O3 (2019)
  • Author(s): Akira Yamakata
  • Organizer: International Congress on Pure & Applied Chemistry (ICPAC) Yangon 2019
  • Int'l Joint Research / Invited
• [Presentation] ビスマス系酸ハロゲン化物光触媒の光励起ダイナミクス (2019)
  • Author(s): 山方啓, 小川貴史, 白木恭平, 小川幹太, 桑原彰秀, 阿部竜, 陰山洋
  • Organizer: 2019年光化学討論会
• [Presentation] チタン酸ストロンチウムのキャリアーダイナミクス (2019)
  • Author(s): 加藤康作, 姜君哲, 酒多喜久, 山方啓
  • Organizer: 2019年光化学討論会
• [Presentation] C3N4共重合体によるCO2還元光触媒反応の高活性化 (2019)
  • Author(s): 柴田健吾, 加藤康作, 山方啓, 石谷治, 前田和彦
  • Organizer: 第124回触媒討論会
• [Presentation] 光励起キャリアの有効利用による層状酸ハロゲン化物光触媒の水素生成活性向上 (2019)
  • Author(s): 小川幹太, 冨田修, 立川貴士, 山方啓, 阿部竜
  • Organizer: 第124回触媒討論会
• [Presentation] 不純物をドープしたチタン酸ストロウムの過渡吸収測定 (2019)
  • Author(s): 加藤康作, 姜君哲, 酒多喜久, 山方啓
  • Organizer: 第124回触媒討論会
• [Presentation] 金属微粒子を担持した酸化チタンの可視光励起ダイナミクス (2019)
  • Author(s): 白木恭平, 井上直洋, 山方啓
  • Organizer: 第124回触媒討論会
• [Presentation] 酸化チタン光電極の表面修飾効果 (2019)
  • Author(s): 林成希, 山方啓
  • Organizer: 第124回触媒討論会
• [Presentation] Preparation of High Active SrTiO3 to photocatalytic overall H2O splitting by doping Na ion (2019)
  • Author(s): Junzhe Jiang, Hirotaka Fujimori, Akira Yamakata, Yoshihisa Sakata
  • Organizer: 第124回触媒討論会
• [Presentation] ビスマス系酸ハロゲン化物のアニオン欠陥準位 (2019)
  • Author(s): 山方啓, 小川貴史, 白木恭平, 小川幹太, Chandana Sampath Kumara Ranasinghe, 桑原彰秀, 阿部竜, 陰山洋
  • Organizer: 第124回触媒討論会
• [Presentation] Enhancement of photocatalytic activity of Ga2O3 based photocatalysts studied by time-resolved absorption spectroscopy (2019)
  • Author(s): Akira Yamakata
  • Organizer: The 24th International Conference on Semiconductor Photocatalysis and Solar Energy Conversion (SPASEC-24)
  • Int'l Joint Research / Invited
• [Presentation] Charge Carrier Dynamics on Powder Photocatalysts Studied by Time-resolved Visible to Mid-IR absorption Spectroscopy (2019)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo
  • Organizer: International Conference on Photochemistry and Sustainable Energy (ICPSE 2019)
  • Int'l Joint Research / Invited
• [Presentation] Evaluation of NaTaO3 photocatalyst synthesized from various route by time-resolved absorption and emission spectroscopy (2019)
  • Author(s): Yao Lu, Akira Yamakata, Tomoaki Watanabe
  • Organizer: The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)
  • Int'l Joint Research
• [Presentation] Flux Synthesis of Layered Perovskite Oxyhalide Bi4NbO8Cl Photocatalyst for Efficient Water Oxidation Under Visible Light (2019)
  • Author(s): Kanta Ogawa, Akinobu Nakada, Hajime Suzuki, Osamu Tomita, Akira Yamakata, Akinori Saeki, Hiroshi Kageyama, Ryu Abe
  • Organizer: The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)
  • Int'l Joint Research
• [Presentation] Enhancement of photocatalytic activity of Ga2O3 by impurity doping (2019)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo, Shouta Ishiyama, Taishi Hiramine, Yoshihisa Sakata
  • Organizer: The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)
  • Int'l Joint Research / Invited
• [Presentation] Synthesis and Identification of Titanium Oxide Nanoparticle for Molecular Catalyst Senstized Artificial Photosynthesis Systems (2019)
  • Author(s): Keito Sano, Fazalurahman Kuttassery, Akira Yamakata, Bunsho Ohtani, Tetsuya Shimada, Hiroshi Tachibana, Tamao Ishida, Shinsuke Takagi, Haruo Inoue
  • Organizer: 3rd International Solar Fuels Conference (ISF-3) / International Conference on Artificial Photosynthesis-2019 (ICARP2019)
  • Int'l Joint Research
• [Presentation] 不純物をドープしたSrTiO3の光励起キャリアーダイナミクス (2019)
  • Author(s): 加藤康作, 山方啓
  • Organizer: スマートエネルギー研究センターシンポジウム
• [Presentation] レーザー分光を用いた光触媒反応機構の解明 (2019)
  • Author(s): 山方啓
  • Organizer: 第29回キャラクタリゼーション講習会「触媒および表面の解析に役立つキャラクタリゼーションの基礎と実際」
  • Invited
• [Presentation] 酸化タングステン微粒子の光励起キャリアの挙動 (2019)
  • Author(s): 坪井翔哉, 山方啓
  • Organizer: スマートエネルギー研究センターシンポジウム
• [Presentation] Pt担持TiO2における可視光照射時の光励起キャリアダイナミクス (2019)
  • Author(s): 白木恭平, 山方啓
  • Organizer: スマートエネルギー研究センターシンポジウム
• [Presentation] 酸化チタン多層電極の活性評価 (2019)
  • Author(s): 林成希, 山方啓
  • Organizer: スマートエネルギー研究センターシンポジウム
• [Presentation] Defects-induced enhancement of photocatalytic activity of Ga2O3 studied by time-resolved visible to mid-IR absorption spectroscopy (2019)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo, Yoshihisa Sakata
  • Organizer: The 36th International Japan-Korea Seminar on Ceramics (JK-Ceramics 36)
  • Int'l Joint Research / Invited
• [Presentation] SrTiO3の光励起キャリアダイナミクスにおけるNaドープの効果 (2019)
  • Author(s): 加藤康作, 山方啓
  • Organizer: 第13回 表面・界面スペクトロスコピー2019
• [Presentation] 酸ハロゲン化物光触媒の光励起キャリアダイナミクス (2019)
  • Author(s): 山方啓
  • Organizer: 第13回 表面・界面スペクトロスコピー2019
• [Presentation] Behavior of Photogenerated Charge Carriers on Powder Photocatalysts (2019)
  • Author(s): Akira Yamakata
  • Organizer: Materials Research Meeting 2019 (MRM2019)
  • Int'l Joint Research / Invited
• [Presentation] Curious Behaviors of Photogenerated Charge Carriers at the Defects on Powder Photocatalysts (2019)
  • Author(s): Akira Yamakata
  • Organizer: International Workshop on Crystalline Materials and Applications (IWCMA-2019)
  • Int'l Joint Research / Invited
• [Presentation] 高性能光触媒の設計を目指した反応機構の解明 (2019)
  • Author(s): 山方啓
  • Organizer: 中央大学理工学部 研究セミナー
  • Invited
• [Presentation] 各種助触媒担持による層状酸ハロゲン化物光触媒の水分解活性向上 (2019)
  • Author(s): 小川幹太, 中田明伸, 鈴木肇, 冨田修, 東正信, 山方啓, 佐伯昭紀, 阿部竜
  • Organizer: 第123回触媒討論会
• [Presentation] BiVO4光触媒へのボールミル処理効果 (2019)
  • Author(s): 奥野和哉, Junie Jhon M. Vequizo, 山方啓, 垣花眞人, 加藤英樹
  • Organizer: 第123回触媒討論会
• [Presentation] 酸素分圧制御下で合成した不定比SrTiO3-δの光触媒活性への電子ドーピング効果 (2019)
  • Author(s): 西岡駿太, 兵頭潤次, Junie Jhon M. Vequizo, 山下俊介, 熊谷啓, 木本浩司, 山方啓, 山崎仁丈, 前田和彦
  • Organizer: 第123回触媒討論会
• [Presentation] Trapping-Induced Enhancement of Photocatalytic Activity on TiO2 Powders (2018)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo
  • Organizer: International Congress on Pure & Applied Chemistry (ICPAC) 2018
  • Int'l Joint Research / Invited
• [Presentation] Oxygen-Doped Ta3N5 as a Building Block for Z-scheme CO2 Reduction with a Binuclear Ru(II) Complex Workable under a Wide Range of Visible Light (2018)
  • Author(s): Kanemichi Muraoka, Junie Jhon M. Vequizo, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda
  • Organizer: 日本化学会第98春季年会
• [Presentation] Improvement of photocatalytic activity under visible light irradiation by composite with Cu/WO3 and Cu/N-TiO2. (2018)
  • Author(s): Takeshi Ohwaki, Akira Yamakata, Junie Jhon M. Vequizo, Tomoya IIhoshi
  • Organizer: 日本化学会第98春季年会
• [Presentation] Synthesis and photocatalytic activity of a layered perovskite oxynitride Li2LaTa2O6N (2018)
  • Author(s): Takayoshi Oshima, Kanemichi Muraoka, Junie Jhon M. Vequizo, Shunsuke Yamashita, Akira Yamakata, Koji Kimoto, Osamu Ishitani, Kazuhiko Maeda
  • Organizer: 日本化学会第98春季年会
• [Presentation] C3N4の光励起キャリアダイナミクスと錯体触媒への電子移動過程の観察 (2018)
  • Author(s): 栗木亮, Chandana Sampath Kumara Ranasinghe, 山方啓, 石谷治, 前田和彦
  • Organizer: 第121回触媒討論会
• [Presentation] How the Defects Affects the Photocatalytic Activity on Powder and Single Crystalline TiO2 (2018)
  • Author(s): Akira Yamakata
  • Organizer: International Conference on Ceramic Materials and Components for Energy and Environmental Applications (CMCEE 2018)
  • Int'l Joint Research / Invited
• [Presentation] Defects Induced Enhancement of Ga2O3 Based Photocatalysts Studied by Time-Resolved Absorption Spectroscopy (2018)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo, Yoshihisa Sakata
  • Organizer: 2018 International Symposium on Advancement and Prospect of Catalysis Science & Technology
  • Int'l Joint Research / Invited
• [Presentation] The Role of Powder Defects for Efficient Photocatalytic Reactions (2018)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo
  • Organizer: The 22nd International Conference on Photochemical Conversion and Storage of Solar Energy (IPS-22)
  • Int'l Joint Research / Invited
• [Presentation] Remarkable Activity Enhancement of Ca and Zn Doped Ga2O3 Photocatalysts Studied by Transient Absorption Spectroscopy (2018)
  • Author(s): Junie Jhon M. Vequizo, Shouta Ishiyama, Yoshihisa Sakata, Akira Yamakata
  • Organizer: The 22nd International Conference on Photochemical Conversion and Storage of Solar Energy (IPS-22)
  • Int'l Joint Research
• [Presentation] Effects of Surface Defects on Powder Photocatalysts Studied by Time-resolved Visible to Mid-IR Absorption Spectroscopy (2018)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo
  • Organizer: International Workshop on Water Splitting: Challenges and Opportunity
  • Int'l Joint Research / Invited
• [Presentation] Synthesis of 2D perovskite oxynitride Li2LaTa2O6N and the photocatalytic performance for CO2 reduction (2018)
  • Author(s): Takayoshi Oshima, Kanemichi Muraoka, Junie Jhon M. Vequizo, Sunsuke Yamashita, Akira Yamakata, Koji Kimoto, Osamu Ishitani, Kazuhiko Maeda
  • Organizer: The 8th Tokyo Conference on Advanced Catalytic Science and Technology (TOCAT8)
  • Int'l Joint Research
• [Presentation] Effects of electron doping with oxygen defect introduction on photocatalytic hydrogen/oxygen evolution activity of non-stoichiometric SrTiO3-δ (2018)
  • Author(s): Shunta Nishioka, Junji Hyodo, Junie Jhon M. Vequizo, Shunsuke Yamashita, Hiromu Kumagai, Koji Kimoto, Akira Yamakata, Yoshihiro Yamazaki, Kazuhiko Maeda
  • Organizer: The 8th Tokyo Conference on Advanced Catalytic Science and Technology (TOCAT8)
  • Int'l Joint Research
• [Presentation] Oxygen-doped Ta3N5 modified with a Ru(II) binuclear complex having the ability to reduce CO2 under a wide range of visible light (2018)
  • Author(s): Kanemichi Muraoka, Junie Jhon M. Vequizo, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda
  • Organizer: The 8th Tokyo Conference on Advanced Catalytic Science and Technology (TOCAT8)
  • Int'l Joint Research
• [Presentation] Nitrogen/fluorine codoped rutile titanium(IV) oxide as a visible-light-driven photocatalyst for water oxidation (2018)
  • Author(s): Akinobu Miyoshi, Yuma Kato, Junie Jhon M. Vequizo, Shunsuke Yamashita, Shunsuke Nozawa, Akira Yamakata, Tomoko Yoshida, Koji Kimoto, Kazuhiko Maeda
  • Organizer: The 8th Tokyo Conference on Advanced Catalytic Science and Technology (TOCAT8)
  • Int'l Joint Research
• [Presentation] Photocatalytic CO2 reduction under visible light using carbon nitride and a binuclear Ru(II) complex (2018)
  • Author(s): Ryo Kuriki, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda
  • Organizer: The 8th Tokyo Conference on Advanced Catalytic Science and Technology (TOCAT8)
  • Int'l Joint Research
• [Presentation] Behavior of Photogenerated Charge Carriers on Highly Efficient Photocatalysts (2018)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo
  • Organizer: The 8th Advanced Functional Materials and Devices (AFMD 2018)
  • Int'l Joint Research / Invited
• [Presentation] ソルボサーマル反応をベースとした光触媒コンポジットの合成と活性向上 (2018)
  • Author(s): 小松田紫央, 朝倉裕介, Junie Jhon M. Vequizo, 山方啓, 殷シュウ
  • Organizer: (公社) 日本セラミックス協会 第31回秋季シンポジウム 特定セッション 水溶液プロセスが可能にするセラミックス合成
• [Presentation] 時間分解分光測定を利用した高活性光触媒の反応機構解明 (2018)
  • Author(s): 山方啓, Junie Jhon M. Vequizo
  • Organizer: (公社) 日本セラミックス協会 第31回秋季シンポジウム 特定セッション 先進的な構造科学と分析技術
  • Invited
• [Presentation] Synthesis of nitrogen/fluorine codoped rutile TiO2 photocatalyst and its application for Z-scheme water splitting (2018)
  • Author(s): Akinobu Miyoshi, Junie Jhon M. Vequizo, Shunta Nishioka, Shunsuke Yamashita, Akihide Iwase, Shunsuke Nozawa, Akira Yamakata, Koji Kimoto, Akihiko Kudo, Kazuhiko Maeda
  • Organizer: 2018年光化学討論会
• [Presentation] Dynamics of photocarriers in reduced TiO2 studied by transient visible to mid-IR absorption spectroscopy (2018)
  • Author(s): Junie Jhon M. Vequizo, Fumiaki Amano, Akira Yamakata
  • Organizer: 2018年光化学討論会
• [Presentation] 光触媒粒子における電子のトラップ過程と蓄積過程 (2018)
  • Author(s): 山方啓, Junie Jhon M. Vequizo, 岡村翔, 白木恭平
  • Organizer: 第12回分子科学討論会
• [Presentation] 金属酸窒化物光触媒における光励起キャリアーの過渡吸収 (2018)
  • Author(s): 山方啓, Junie Jhon M. Vequizo, Mirabbos Hojamberdiev, Shanshan Chen, 手島勝弥, 堂免一成
  • Organizer: 第122回触媒討論会
• [Presentation] Impact of Cocatalyst on the Dynamics of Photocarriers in Ga2O3 Powders Studied by Time-Resolved Absorption Spectroscopy (2018)
  • Author(s): Junie Jhon M. Vequizo, Shouta Ishiyama, Yoshihisa Sakata, Akira Yamakata
  • Organizer: 第122回触媒討論会
• [Presentation] Electron Transfer to Water Molecules on Rh-loaded Ga2O3 Photocatalysts (2018)
  • Author(s): Junie Jhon M. Vequizo, Shoya Tsuboi, Shouta Ishiyama, Yoshihisa Sakata, Akira Yamakata
  • Organizer: グリーン電子素子・材料研究センター 最終年度シンポジウム
• [Presentation] 過渡吸収分光測定を用いた光触媒粒子の光励起ダイナミクス (2018)
  • Author(s): 山方啓
  • Organizer: 第49回中部化学関係学協会支部連合秋季大会
  • Invited
• [Presentation] ポンププローブ法による界面ダイナミクス (2018)
  • Author(s): 山方啓
  • Organizer: 2018年電気化学会関東支部セミナー 先端計測技術による電極界面分析の新展開
  • Invited
• [Presentation] 高活性光触媒の実現を目指した新しい分光測定技術の開発 (2018)
  • Author(s): 山方啓
  • Organizer: 第11回ワークショップ 固体材料合成および評価技術の新展開
  • Invited
• [Presentation] Time-resolved Absorption Study on the Behavior of Photogenerated Electrons and Holes in Highly Active Photocatalysts (2018)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo
  • Organizer: Functional Ceramics forum for the upcoming Annual Materials Science Conference
  • Int'l Joint Research / Invited
• [Presentation] Curious Behavior of Photogenerated Electrons and Holes in Single-crystalline and Powder Photocatalysts (2018)
  • Author(s): Akira Yamakata
  • Organizer: Research Seminar at National Chung Hsing University
  • Int'l Joint Research / Invited
• [Presentation] Time-Resolved Visible to mid-IR Absorption Study of Photodynamics on Powder Photocatalysts (2018)
  • Author(s): Akira Yamakata
  • Organizer: Research Seminar at National Chiao Tung University
  • Int'l Joint Research / Invited
• [Presentation] 超高活性Ga2O3系水分解光触媒の光励起ダイナミクス (2018)
  • Author(s): 山方啓, Junie Jhon M. Vequizo, 石山翔太, 酒多喜久
  • Organizer: 表面・界面スペクトロスコピー2018
• [Presentation] 時間分解分光測定による高活性光触媒反応のメカニズム解明 (2018)
  • Author(s): 山方啓
  • Organizer: 熊本大学工学部研究セミナー
  • Invited
• [Presentation] Photocatalytic Activity of Oxygen Deficient SrTiO3-d Prepared by Reduced Atmosphere Calcination (2017)
  • Author(s): Shunta Nishioka, Junji Hyodo, Akira Yamakata, Yoshihiro Yamazaki, Kazuhiko Maeda
  • Organizer: 16th Korea-Japan Symposium on Catalysis & 3rd International Symposium of Institute for Catalysis
  • Int'l Joint Research
• [Presentation] Behavior of Photogenerated Charge Carriers in BiVO4 Based Heterojunctions (2017)
  • Author(s): Chandana Sampath Kumara Ranasinghe, Akira Yamakata
  • Organizer: 16th Korea-Japan Symposium on Catalysis & 3rd International Symposium of Institute for Catalysis
  • Int'l Joint Research
• [Presentation] Dynamics of Photocarriers in Ga2O3-based Photocatalyst Studied by Transient Absorption Spectroscopy (2017)
  • Author(s): Junie Jhon M. Vequizo, Shouta Ishiyama, Yoshihisa Sakata, Akira Yamakata
  • Organizer: 16th Korea-Japan Symposium on Catalysis & 3rd International Symposium of Institute for Catalysis
  • Int'l Joint Research
• [Presentation] Water Splitting and CO2 Fixation on Visible-Light-Responsive Rutile TiO2-based Photocatalysts (2017)
  • Author(s): Kazuhiko Maeda, Akinobu Nakada, Koki Ishimaki, Junie Jhon M. Vequizo, Akira Yamakata, Osamu Ishitani
  • Organizer: 16th Korea-Japan Symposium on Catalysis & 3rd International Symposium of Institute for Catalysis
  • Int'l Joint Research
• [Presentation] Difference in the Behavior of Photogenerated Electrons and Holes on Anatase and Rutile TiO2 Powders (2017)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo, Hironori Matsunaga
  • Organizer: 16th Korea-Japan Symposium on Catalysis & 3rd International Symposium of Institute for Catalysis
  • Int'l Joint Research
• [Presentation] Behaviors of Photogenerated Electrons and Holes in Photoelectrochemical Interfaces (2017)
  • Author(s): Akira Yamakata
  • Organizer: International Symposium on Pure & Applied Chemistry (ISPAC) 2017
  • Int'l Joint Research / Invited
• [Presentation] Reaction dynamics at the liquid/solid soft-interfaces (2017)
  • Author(s): Akira Yamakata
  • Organizer: KAKENHI International Symposium on “Studying the Function of Soft Molecular Systems”
  • Int'l Joint Research / Invited
• [Presentation] 金属酸窒化物複合アニオン型光触媒のキャリアーダイナミクス (2017)
  • Author(s): 山方啓
  • Organizer: 新学術領域研究 (平成28-32年度) 複合アニオン化合物の創製と新機能 第2回トピカル会議 (機能)
  • Invited
• [Presentation] Effects of the Preparation Methods of Na ion Doped SrTiO3 to the Photocatalytic Property of Overall H2O Splitting (2017)
  • Author(s): Kohki Ishikiriyama, Yosuke Goto, Takashi Hisatomi, Toshiya Yokogawa, Akira Yamakata, Yoshihisa Sakata, Kazunari Domen
  • Organizer: 13th European Congress on Catalysis (EUROPACAT 2017)
  • Int'l Joint Research
• [Presentation] Influences of the Metal Ion Addition to Ga2O3 to the Photocatalytic Property of Overall H2O Splitting (2017)
  • Author(s): Shota Ishiyama, Shiqi Zhang, Akira Yamakata, Toshiya Yokogawa, Yoshihisa Sakata
  • Organizer: 13th European Congress on Catalysis (EUROPACAT 2017)
  • Int'l Joint Research
• [Presentation] Development of hybrid photocatalysts for visible-light CO2 reduction using carbon nitride and a binuclear Ru(II) complex (2017)
  • Author(s): Ryo Kuriki, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda
  • Organizer: 2017年光化学討論会
• [Presentation] Fabrication of Highly Efficient TiO2 Photoanodes by Atomized Spray Pyrolysis Deposition (2017)
  • Author(s): Chandana Sampath Kumara Ranasinghe, Akira Yamakata
  • Organizer: 2017年光化学討論会
• [Presentation] Dynamics of Photocarriers in Metal Ion Doped Ga2O3 Photocatalysts Studied by Transient Absorption Spectroscopy (2017)
  • Author(s): Junie Jhon M. Vequizo, Shouta Ishiyama, Yoshihisa Sakata, Akira Yamakata
  • Organizer: 2017年光化学討論会
• [Presentation] 金属イオン添加Ga2O3光触媒のH2O完全分解反応に対する光触媒特性 (2017)
  • Author(s): 石山翔太, 横川俊哉, 山方啓, 酒多喜久
  • Organizer: 第120回触媒討論会
• [Presentation] コバルト酸化物を担持した酸化チタンのキャリアーダイナミクス (2017)
  • Author(s): 汪雨濃, Junie Jhon M. Vequizo, 岡崎めぐみ, 前田和彦, 山方啓
  • Organizer: 第120回触媒討論会
• [Presentation] Behavior of Photogenerated Charge Carriers in SnO2/BiVO4/CoOx Heterostructure Studied by Transient Absorption Spectroscopy (2017)
  • Author(s): Chandana Sampath Kumara Ranasinghe, Akira Yamakata
  • Organizer: 第120回触媒討論会
• [Presentation] Effects of Metal Ion-Doping on Ga2O3 Photocatalysts Studied by Transient Absorption Spectroscopy (2017)
  • Author(s): Junie Jhon M. Vequizo, Shouta Ishiyama, Yoshihisa Sakata, Akira Yamakata
  • Organizer: 第120回触媒討論会
• [Presentation] 金属イオンをドープしたGa2O3の光励起ダイナミクス (2017)
  • Author(s): 山方啓, Junie Jhon M. Vequizo, 石山翔太, 酒多喜久
  • Organizer: 第11回分子科学討論会
• [Presentation] Transient Absorption Study of Photogenerated Charge Carriers in Electrochemical Systems (2017)
  • Author(s): Chandana Sampath Kumara Ranasinghe, Akira Yamakata
  • Organizer: スマートエネルギー技術研究センター 第10回シンポジウム
• [Presentation] Effects of Surface Modification on Powder Photocatalysts Studied by Transient Absorption Spectroscopy (2017)
  • Author(s): Junie Jhon M. Vequizo, Chandana Sampath Kumara Ranasinghe, Shouta Ishiyama, Yoshihisa Sakata, Akira Yamakata
  • Organizer: スマートエネルギー技術研究センター 第10回シンポジウム
• [Presentation] 超高活性Ga2O3系水分解光触媒の反応機構 (2017)
  • Author(s): 山方啓
  • Organizer: スマートエネルギー技術研究センター 第10回シンポジウム
• [Presentation] Impact of Metal Ion Doping on Ga2O3 Photocatalysts Studied by Transient Absorption Spectroscopy (2017)
  • Author(s): Junie Jhon M. Vequizo, Akira Yamakata
  • Organizer: 2017 ASEAN Conference on Advanced Functional Materials and Nanotechnology (ASEAN-AFMN)
  • Int'l Joint Research / Invited
• [Presentation] Mechanism of Photocatalytic Reactions on TiO2 Powders (2017)
  • Author(s): Akira Yamakata
  • Organizer: 19th SPVM National Physics Conference, 2017 ASEAN Conference on Advanced Functional Materials and Nanotechnology (ASEAN-AFMN), and 5th International Meeting on Complex Systems (IMCS)
  • Int'l Joint Research / Invited
• [Presentation] Carrier Dynamics on TiO2 Powders Studied by Time-Resolved IR Absorption Spectroscopy (2017)
  • Author(s): Pei-Hsuan Hung, Junie Jhon M. Vequizo, Akira Yamakata, Wenjea J. Tseng
  • Organizer: 6th International Symposium on Advanced Ceramics and Technology for Sustainable Energy Applications toward a Low Carbon Society (ACTSEA 2017)
  • Int'l Joint Research
• [Presentation] Trapping States and Behavior of Photocarriers in Brookite TiO2 Powders Studied by Transient Absorption and Emission Spectroscopies (2017)
  • Author(s): Junie Jhon M. Vequizo, Hironori Matsunaga, Teruhisa Ohno, Akira Yamakata
  • Organizer: The 6th Toyota RIKEN International Workshop 2017
  • Int'l Joint Research
• [Presentation] Behaviors of Electrons and Holes in Photocatalysts Studied by Time-resolved Visible to Mid-IR Absorption Spectroscopy (2017)
  • Author(s): Akira Yamakata
  • Organizer: International Conference on Photochemistry and Its Applications (ICPA 2017)
  • Int'l Joint Research / Invited
• [Presentation] Behaviors of Photogenerated Electrons and Holes on TiO2 Powder Photocatalysts (2017)
  • Author(s): Akira Yamakata, Junie Jhon M. Vequizo, Hironori Matsunaga
  • Organizer: The 22nd International Conference on Semiconductor Photocatalysis and Solar Energy Conversion (SPASEC-22)
  • Int'l Joint Research / Invited
• [Presentation] Principal Difference in the Behaviors of Photogenerated e- and h+ in Anatase and Rutile TiO2 Powders (2017)
  • Author(s): Akira Yamakata
  • Organizer: 東京大学第5回伊藤国際学術研究センター会議 (IIRC5) －Forefront of Molecular Dynamics at Surfaces and Interfaces: From a single molecule to catalytic reaction－
  • Int'l Joint Research
• [Presentation] 酸素空孔濃度および電子濃度を制御したSrTiO3における光触媒特性 －欠陥化学と光化学反応－ (2017)
  • Author(s): 兵頭潤次, 西岡駿太, 熊谷啓, 前田和彦, Junie Jhon M. Vequizo, 山方啓, 山崎仁丈
  • Organizer: 第43回固体イオニクス討論会
• [Book] エネルギー変換型光触媒；コラム 9 「時間分解過渡吸収分光法によるキャリアダイナミクスの解明」 (2017)
  • Author(s): 日本化学会、久富 隆史、久保田 純、堂免 一成；山方啓 (コラム執筆)
  • Total Pages: 136
  • Publisher: 共立出版
  • ISBN: 9784320044623
• [Patent(Industrial Property Rights)] 構造物及びその製造方法 (2018)
  • Inventor(s): 山方啓
  • Industrial Property Rights Holder: 山方啓
  • Industrial Property Rights Type: 特許
  • Filing Date: 2018
  • Overseas