Operand observation of excited carrier transfers in photoelectrodes for water splitting by electrochemical XAFS

2013 Fiscal Year Final Research Report

• Project/Area Number: 24750134
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Functional materials chemistry
• Research Institution: Keio University
• Principal Investigator: YOSHIDA Masaaki 慶應義塾大学, 理工学部, 助教 (00582206)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Keywords: X線吸収分光 / 光電極 / 水分解 / 励起キャリア / 電気化学 / 助触媒 / 酸化マンガン / 放射光

Research Abstract

Solar hydrogen production from water using photoelectrochemical cells is an attractive candidate for the renewable energy supply. Many semiconductor photoelectrodes for overall water splitting have already been established after the discovery of the Honda-Fujishima effect. Recently, metal oxides such as manganese oxide or cobalt phosphate have been demonstrated to substantially improve the photoelectrochemical efficiency for water splitting, because the metal oxides on the semiconductors can function as oxygen evolution cocatalyst. Therefore, we applied the in-situ Mn K-edge X-ray absorption spectroscopy technique for the observation of photoexcited carrier transfer from Nb:SrTiO3 photoelectrode to metal oxide cocatalysts during photoelectrochemical reaction.

Research Products

• [Journal Article] Electrochromic Characteristics of a Nickel Borate Thin Film Investigated by In Situ XAFS and UV/vis Spectroscopy (2014)
  • Author(s): M. Yoshida, T. Iida, T. Mineo, T. Yomogida, K. Nitta, K. Kato, H. Nitani, H. Abe, T. Uruga, and H. Kondoh
  • Journal Title: Electrochemistry Volume: 82 Pages: 355
  • DOI: 10.5796/electrochemistry.82.355
  • Peer Reviewed
• [Journal Article] Lanthanoid Oxide Layers on Rhodium-Loaded (Ga_1–xZn_x)(N_1–xO_x) Photocatalyst as a Modifier for Overall Water Splitting under Visible-Light Irradiation (2013)
  • Author(s): M. Yoshida, K. Maeda, D. Lu, J. Kubota and K. Domen
  • Journal Title: J. Phys. Chem. C Volume: 117 Pages: 14000
  • DOI: 10.1021/jp402240d
  • Peer Reviewed
• [Journal Article] In situ observation of carrier transfer in the Mn-oxide/Nb : SrTiO_3 photoelectrode by X-ray absorption spectroscopy (2013)
  • Author(s): M. Yoshida, T. Yomogida, T. Mineo, K. Nitta, K. Kato, T. Masuda, H. Nitani, H. Abe, S. Takakusagi, T. Uruga, K. Asakura, K. Uosaki and H. Kondoh
  • Journal Title: Chem. Commun. Volume: 49 Pages: 7848
  • DOI: 10.1039/C3CC43584A
  • Peer Reviewed
• [Presentation] In-Situ X線吸収分光法によるMnO_x/SrTiO_3水分解光触媒上での励起キャリア移動の観測 (2013)
  • Author(s): 吉田真明、 他13名
  • Organizer: 第33回表面科学学術講演会
  • Place of Presentation: つくば国際会議場エポカル
  • Year and Date: 2013-11-26
• [Presentation] Observation of photoexcited carrier transfer in MnO_x/SrTiO_3 photocatalyst by in-situ X-ray absorption fine structure (2013)
  • Author(s): M. Yoshida et al.
  • Organizer: The 6^<th> Asia-Pacific Congress on Catalysis
  • Place of Presentation: Taipei, Taiwan
  • Year and Date: 2013-10-16
• [Presentation] In-situ X線吸収分光法による水分解光電極上の酸化マンガン助触媒への電荷移動の観測 (2013)
  • Author(s): 吉田真明、 他12名
  • Organizer: 電気化学会第80回大会
  • Place of Presentation: 東北大学川内キャンパス
  • Year and Date: 2013-03-29
• [Presentation] In-situ X線吸収分光法を利用した水分解用光電極上の酸化マンガン助触媒への励起キャリア移動の観測 (2013)
  • Author(s): 吉田真明、 他13名
  • Organizer: 第111回触媒討論会
  • Place of Presentation: 関西大学千里山キャンパス
  • Year and Date: 2013-03-26
• [Presentation] In-situ X線吸収分光法を利用した水分解用光電極上の酸化マンガン助触媒への励起キャリア移動の観測 (2012)
  • Author(s): 吉田真明、 他13名
  • Organizer: 第32回表面科学学術講演会
  • Place of Presentation: 東北大学片平キャンパス
  • Year and Date: 2012-11-20
• [Presentation] In-situ XAFS法を利用した水分解用光電極上の酸素生成助触媒への励起キャリア移動の観測 (2012)
  • Author(s): 吉田真明、 他13名
  • Organizer: 第15回XAFS討論会
  • Place of Presentation: 兎会館
  • Year and Date: 2012-09-11
• [Remarks]
  • URL: http://www.chem.keio.ac.jp/~kondoh/index/jp/