Oxide thermoelectric materials with built-in bulk nanoheterostructures

• Project/Area Number: 26289242
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Inorganic materials/Physical properties
• Research Institution: Kyushu University
• Principal Investigator: Ohtaki Michitaka 九州大学, 総合理工学研究科(研究院), 教授 (50223847)
• Co-Investigator(Kenkyū-buntansha): 渡邊 厚介 九州大学, エネルギー基盤技術国際教育研究センター, 助教 (40617007)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000); Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2015: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2014: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
• Keywords: ナノ微細構造 / ヘテロ界面 / 酸化亜鉛 / 酸化物熱電変換材料 / 共ドープ / フォノン散乱 / 熱伝導率 / ナノ粒子 / 複合ドープ / 微細構造 / 熱電変換材料 / 第二相 / 細孔 / 機能性セラミックス材料 / ナノ構造制御 / 粒界制御 / 複合構造 / 異方性 / 熱サイクル

Outline of Final Research Achievements

Nano-heterostructured ZnO ceramics were prepared by multinary doping and dispersion of metallic nanoparticles into the bulk oxide samples. Significantly different nanostructures with also different scattering mechanisms were obtained with different dopants, suggesting an enhancement of multiple scattering mechanisms might be possible by carefully selecting a combination of dopants. Dispersion of metallic nanoparticles such as Au and Ag were also enabled us to enhance the electrical conductivity and to reduce the thermal conductivity simultaneously. Nanoheterostructures are thereby strongly suggested to be promising to further improve the thermoelectric performance of oxide-based thermoelectric materials.

Research Products

• [Journal Article] Synthesis and thermoelectric properties of nanoporous oxide composites containing metal nanoparticles (2016)
  • Author(s): Shinji Hirata, Michitaka Ohtaki
  • Journal Title: Proceedings of the 18th Cross Straits Symposium on Energy and Environmental Sciences and Technology Volume: 18 Pages: 35-36
• [Journal Article] Synthesis and thermoelectric properties of layered oxyselenides and oxyphosphides (2016)
  • Author(s): Takuya Kagawa, Michitaka Ohtaki
  • Journal Title: Proceedings of the 18th Cross Straits Symposium on Energy and Environmental Sciences and Technology Volume: 18 Pages: 269-270
• [Journal Article] Effects of microstructure on thermoelectric properties of dually doped ZnO (2015)
  • Author(s): Toshifumi Ogawa, Michitaka Ohtaki
  • Journal Title: Proceedings of the 17th Cross Straits Symposium on Energy and Environmental Science and Technology Volume: 17 Pages: 97-98
• [Journal Article] Switching the thermal conductivity by phase transitions in metal oxides (2015)
  • Author(s): Kei Watanabe, Michitaka Ohtaki
  • Journal Title: Proceedings of the 17th Cross Straits Symposium on Energy and Environmental Science and Technology Volume: 17 Pages: 105-106
• [Journal Article] Synthesis and thermoelectrics proreties of nanoporous oxide formed by selective leaching of metal nanoparticles (2015)
  • Author(s): Shinji Hirata, Michitaka Ohtaki
  • Journal Title: Proceedings of the 17th Cross Straits Symposium on Energy and Environmental Science and Technology Volume: 17 Pages: 111-112
• [Journal Article] Thermoelectric properties of ferroelectric oxides reduced by hydrogen (2015)
  • Author(s): Yoshinao Kai, Michitaka Ohtaki
  • Journal Title: Proceedings of the 17th Cross Straits Symposium on Energy and Environmental Science and Technology Volume: 17 Pages: 121-122
• [Journal Article] ｓEffects of morphology on the thermoelectric properties of Al-doped ZnO (2014)
  • Author(s): Li Han, Ngo Van Nong, Wei Zhan, Le Thanh Hung, Tim Holgate, Kazunari Tashiro, Michitaka Ohtaki, Nini Pryds, Søren Linderoth
  • Journal Title: RSC Advances Volume: 4 Issue: 24 Pages: 12353-12361
  • DOI: 10.1039/c3ra47617k
  • Peer Reviewed
• [Journal Article] Oxide Thermoelectric Materials for Power Generation from Mid-to-High Temperature Unused Heat Energy (2014)
  • Author(s): Michitaka Ohtaki
  • Journal Title: Proceedings of the 16th Cross Straits Symposium on Energy and Environmental Science and Technology Volume: 1 Pages: 29-32
• [Journal Article] Performance Stability of ZnO-based Oxide Thermoelectric Materials at High Temperature (2014)
  • Author(s): Taiga Kuragaki, Michitaka Ohtaki
  • Journal Title: Proceedings of the 16th Cross Straits Symposium on Energy and Environmental Science and Technology Volume: 1 Pages: 181-182
• [Presentation] Nanostructure and Phonon Engineering in Oxide Thermoelectric Materials (2017)
  • Author(s): Michitaka Ohtaki
  • Organizer: TMS 2017 146th Annual Meeting and Exhibition
  • Place of Presentation: San Diego, USA
  • Year and Date: 2017-02-26
  • Int'l Joint Research / Invited
• [Presentation] Thermoelectric Properties of ZnO with Au Nanoparticles Dispersed therein (2017)
  • Author(s): Kosuke Watanabe, Kazuki Mine, Koichiro Suekuni, Michitaka Ohtaki
  • Organizer: The 18th International Symposium on Eco-materials Processing and Design
  • Place of Presentation: Okinawa, Japan
  • Year and Date: 2017-02-17
  • Int'l Joint Research
• [Presentation] Synthesis and thermoelectric properties of nanoporous oxide composites containing metal nanoparticles (2016)
  • Author(s): Shinji Hirata, Michitaka Ohtaki
  • Organizer: The 18th Cross Straits Symposium on Energy and Environmental Sciences and Technology
  • Place of Presentation: Shanghai, China
  • Year and Date: 2016-12-04
  • Int'l Joint Research
• [Presentation] Synthesis and thermoelectric properties of layered oxyselenides and oxyphosphides (2016)
  • Author(s): Takuya Kagawa, Michitaka Ohtaki
  • Organizer: The 18th Cross Straits Symposium on Energy and Environmental Sciences and Technology
  • Place of Presentation: Shanghai, China
  • Year and Date: 2016-12-04
  • Int'l Joint Research
• [Presentation] Thermal Conductivity Reduction in Oxides for Thermoelectric Energy Conversion (2016)
  • Author(s): Michitaka Ohtaki
  • Organizer: The 33rd International Korea-Japan Seminar on Ceramics
  • Place of Presentation: Daejeon, Korea
  • Year and Date: 2016-11-16
  • Int'l Joint Research / Invited
• [Presentation] Oxide Thermoelectric Materials for Waste Heat Energy Recuperation (2016)
  • Author(s): Michitaka Ohtaki
  • Organizer: Global Congress & Expo on Materials Science & Nanoscience
  • Place of Presentation: Dubai, UAE
  • Year and Date: 2016-10-24
  • Int'l Joint Research / Invited
• [Presentation] Oxide Materials for Thermoelectric Energy Conversion (2016)
  • Author(s): Michitaka Ohtaki, Kohei Mizuta, and Toshifumi Ogawa
  • Organizer: Functional Energy Materials Conference 2016
  • Place of Presentation: Cavtat, Croatia
  • Year and Date: 2016-09-28
  • Int'l Joint Research
• [Presentation] 酸化物セラミックスの相転移現象に伴う熱伝導率変化 (2016)
  • Author(s): 渡部啓, 大瀧倫卓, 戸村信雄, 北岡賢治, 篠崎泰夫
  • Organizer: 日本セラミックス協会第29回秋季シンポジウム
  • Place of Presentation: 広島大学
  • Year and Date: 2016-09-07
• [Presentation] ZnO焼結体への金属ナノ粒子分散プロセスと熱電特性 (2016)
  • Author(s): 渡邊厚介, 小川敏史, 大瀧倫卓
  • Organizer: 日本セラミックス協会第29回秋季シンポジウム
  • Place of Presentation: 広島大学
  • Year and Date: 2016-09-07
• [Presentation] ZnO-based Oxide Thermoelectric Materials with Microstructure Control for Selective Phonon Scattering (2016)
  • Author(s): Michitaka Ohtaki
  • Organizer: Materials Challenges in Alternative & Renewable Energy Conference
  • Place of Presentation: Clearwater, FL, USA
  • Year and Date: 2016-04-17
  • Int'l Joint Research / Invited
• [Presentation] 液相前駆体法によるAg/ZnO 焼結体の微細構造と熱電特性 (2016)
  • Author(s): 渡邊厚介、大瀧倫卓
  • Organizer: 日本セラミックス協会2016年年会
  • Place of Presentation: 早稲田大学
  • Year and Date: 2016-03-14
• [Presentation] Oxide Materials with Ultra-low Lattice Thermal Conductivity (2016)
  • Author(s): Michitaka Ohtaki
  • Organizer: The EMN Meeting on Thermoelectric Materials
  • Place of Presentation: アメリカ・Orlando
  • Year and Date: 2016-02-21
  • Int'l Joint Research / Invited
• [Presentation] Thermoelectric Performance of Multinary-doped ZnO with Enhanced Phonon Scattering (2015)
  • Author(s): Michitaka Ohtaki, Yuki Iwano, and Taiga Kuragaki
  • Organizer: The 3rd International Renewable and Sustainable Energy Conference
  • Place of Presentation: モロッコ・Marrakech
  • Year and Date: 2015-12-10
  • Int'l Joint Research
• [Presentation] Effects of microstructure on thermoelectric properties of dually doped ZnO (2015)
  • Author(s): Toshifumi Ogawa, Michitaka Ohtaki
  • Organizer: The 17th Cross Straits Symposium on Energy and Environmental Science and Technology (CSS-EEST17)
  • Place of Presentation: 九州大学
  • Year and Date: 2015-12-02
  • Int'l Joint Research
• [Presentation] Switching the thermal conductivity by phase transitions in metal oxides (2015)
  • Author(s): Kei Watanabe, Michitaka Ohtaki
  • Organizer: The 17th Cross Straits Symposium on Energy and Environmental Science and Technology (CSS-EEST17)
  • Place of Presentation: 九州大学
  • Year and Date: 2015-12-02
  • Int'l Joint Research
• [Presentation] Synthesis and thermoelectrics proreties of nanoporous oxide formed by selective leaching of metal nanoparticles (2015)
  • Author(s): Shinji Hirata, Michitaka Ohtaki
  • Organizer: The 17th Cross Straits Symposium on Energy and Environmental Science and Technology (CSS-EEST17)
  • Place of Presentation: 九州大学
  • Year and Date: 2015-12-02
  • Int'l Joint Research
• [Presentation] Thermoelectric properties of ferroelectric oxides reduced by hydrogen (2015)
  • Author(s): Yoshinao Kai, Michitaka Ohtaki
  • Organizer: The 17th Cross Straits Symposium on Energy and Environmental Science and Technology (CSS-EEST17)
  • Place of Presentation: 九州大学
  • Year and Date: 2015-12-02
  • Int'l Joint Research
• [Presentation] Thermoelectric properties of Ag/ZnO sintered bodies prepared from soft-chemical precursors (2015)
  • Author(s): Kosuke Watanabe, Michitaka Ohtaki
  • Organizer: MRS 2015 Fall Meeting & Exhibit
  • Place of Presentation: アメリカ・Boston
  • Year and Date: 2015-11-29
  • Int'l Joint Research
• [Presentation] Metal Oxides in Thermoelectrics: Beyond a Simple Picture of Ionic Compounds (2015)
  • Author(s): Michitaka Ohtaki
  • Organizer: International Conference on Thermoelectric Materials Science (TMS2015)
  • Place of Presentation: 名古屋大学
  • Year and Date: 2015-11-09
  • Int'l Joint Research / Invited
• [Presentation] Recent Progress in Oxide Thermoelectric Materials with Microstructure Control for Selective Phonon Scattering (2015)
  • Author(s): Michitaka Ohtaki
  • Organizer: 14th International Union of Materials Research Societies- International Conference on Advanced Materials (IUMRS-ICAM2015)
  • Place of Presentation: 大韓民国・済州島
  • Year and Date: 2015-10-25
  • Int'l Joint Research / Invited
• [Presentation] 液相前駆体法によるAg/ZnO焼結体の合成と熱電特性 (2015)
  • Author(s): 渡邊厚介、大瀧倫卓
  • Organizer: 日本熱電学会第12回学術講演会
  • Place of Presentation: 九州大学
  • Year and Date: 2015-09-07
• [Presentation] 金属微粒子の選択溶出によるナノ多孔質酸化物の合成と熱物性 (2015)
  • Author(s): 平田慎治、大瀧倫卓
  • Organizer: 日本熱電学会第12回学術講演会
  • Place of Presentation: 九州大学
  • Year and Date: 2015-09-07
• [Presentation] Selective Phonon Scattering in ZnO-based Bulk Thermoelectric Oxides (2015)
  • Author(s): Michitaka Ohtaki, Taiga Kuragaki, Yuki Iwano, Kiyoshi Yamamoto
  • Organizer: Advanced Materials World Congress 2015
  • Place of Presentation: スウェーデン・Stockholm
  • Year and Date: 2015-08-23
  • Int'l Joint Research
• [Presentation] Microstructure and Thermoelectric Properties of 
Ga/Cu-doped ZnO (2015)
  • Author(s): Michitaka Ohtaki, Taiga Kuragaki
  • Organizer: 34th International Conference on Thermoelectrics/13th European Conference on Thermoelectrics (ICT/ECT2015)
  • Place of Presentation: ドイツ・Dresden
  • Year and Date: 2015-06-28
  • Int'l Joint Research
• [Presentation] 相転移による酸化物材料の熱伝導率変化 (2015)
  • Author(s): 渡部啓、大瀧倫卓
  • Organizer: 第52回化学関連支部合同九州大会
  • Place of Presentation: 北九州国際会議場
  • Year and Date: 2015-06-27
• [Presentation] 水素還元により導電性を付与した強誘電性酸化物の熱電特性 (2015)
  • Author(s): 甲斐義直、大瀧倫卓
  • Organizer: 第52回化学関連支部合同九州大会
  • Place of Presentation: 北九州国際会議場
  • Year and Date: 2015-06-27
• [Presentation] 共ドープしたZnO系酸化物の熱電特性と微細構造制御 (2015)
  • Author(s): 小川敏史、大瀧倫卓
  • Organizer: 第52回化学関連支部合同九州大会
  • Place of Presentation: 北九州国際会議場
  • Year and Date: 2015-06-27
• [Presentation] 金属微粒子の選択溶出によるナノ多孔質酸化物の合成と熱特性 (2015)
  • Author(s): 平田慎治、大瀧倫卓
  • Organizer: 第52回化学関連支部合同九州大会
  • Place of Presentation: 北九州国際会議場
  • Year and Date: 2015-06-27
• [Presentation] 鉄系層状酸化物NaFeO2にPドープしたNaFeO2-xPxの合成 (2015)
  • Author(s): 荒木陽輔、大瀧倫卓
  • Organizer: 第52回化学関連支部合同九州大会
  • Place of Presentation: 北九州国際会議場
  • Year and Date: 2015-06-27
• [Presentation] ZnO-based Oxide Thermoelectric Materials: problems solved and unsolved yet (2015)
  • Author(s): Michitaka Ohtaki
  • Organizer: The 11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications (CMCEE-11)
  • Place of Presentation: カナダ・Vancouver
  • Year and Date: 2015-06-14
  • Int'l Joint Research
• [Presentation] Oxide Materials with Enhanced Phonon Scattering for Thermoelectric Energy Conversion (2015)
  • Author(s): Michitaka Ohtaki
  • Organizer: The 1st International Conference on Microstructure and Property of Materials（MPM-1）
  • Place of Presentation: 中国・Hangzhou
  • Year and Date: 2015-05-26
  • Int'l Joint Research / Invited
• [Presentation] Enhanced Phonon Scattering in Nanostructured Oxide Materials (2015)
  • Author(s): Michitaka Ohtaki
  • Organizer: XVI International Forum on Thermoelectricity
  • Place of Presentation: フランス・Paris
  • Year and Date: 2015-05-19
  • Int'l Joint Research / Invited
• [Presentation] Recent Aspects of Oxide Ceramic Materials for Thermoelectric Energy Conversion (2015)
  • Author(s): Michitaka Ohtaki
  • Organizer: BIT’s 1st Annual World Congress of Smart Materials-2015 (WCSM- 2015)
  • Place of Presentation: Pusan, Korea
  • Year and Date: 2015-03-23 – 2015-03-25
  • Invited
• [Presentation] New Aspects of Oxide Ceramic Materials for Thermoelectric Energy Conversion (2015)
  • Author(s): Michitaka Ohtaki
  • Organizer: Energy, Materials and Nanotechnology, Ceramics Meeting 2015
  • Place of Presentation: Orlando, USA
  • Year and Date: 2015-01-25 – 2015-01-27
  • Invited
• [Presentation] New Aspects in Oxide Thermoelectric Materials for Heat-to-Electricity Direct Energy Conversion (2014)
  • Author(s): Michitaka Ohtaki, Kohei Mizuta, Yuki Iwano
  • Organizer: The 13th Eurasia Conference on Chemical Sciences
  • Place of Presentation: Bangalore, India
  • Year and Date: 2014-12-14 – 2014-12-18
  • Invited
• [Presentation] Enhanced Phonon Scattering and Carrier Compensation in Multinary-doped ZnO Thermoelectric Oxide (2014)
  • Author(s): Michitaka Ohtaki, Yuki Iwano
  • Organizer: MRS 2014 Fall Meeting
  • Place of Presentation: Boston, USA
  • Year and Date: 2014-12-01 – 2014-12-05
• [Presentation] Performance Stability of ZnO-based Oxide Thermoelectric Materials at High Temperature (2014)
  • Author(s): Taiga Kuragaki, Michitaka Ohtaki
  • Organizer: 16th Cross Straits Symposium on Energy and Environmental Science and Technology
  • Place of Presentation: Jeju, Korea
  • Year and Date: 2014-11-13 – 2014-11-15
• [Presentation] ZnO系酸化物熱電材料の高温安定性 (2014)
  • Author(s): 倉垣大河、大瀧倫卓
  • Organizer: 日本熱電学会第11回学術講演会
  • Place of Presentation: 茨城県つくば市
  • Year and Date: 2014-09-29 – 2014-09-30
• [Presentation] High-temperature Durability of doped ZnO on Thermal Cycling under Aerobic Conditions (2014)
  • Author(s): Michitaka Ohtaki, Taiga Kuragaki, Taketoshi Tomida
  • Organizer: The 15th IUMRS-International Conference in Asia (IUMRS-ICA 2014)
  • Place of Presentation: 福岡県福岡市
  • Year and Date: 2014-08-24 – 2014-08-28
• [Book] Oxide Thin Films, Multilayers and Nanocomposites (2015)
  • Author(s): Michitaka Ohtaki, 他13名
  • Total Pages: 316
  • Publisher: Springer International Publishing
• [Book] 熱電変換材料 実用・活用を目指した設計と開発 ～材料技術/モジュール化/フレキシブル化/実用例～ (2014)
  • Author(s): 大瀧 倫卓、他28名
  • Total Pages: 249
  • Publisher: (株)情報機構
• [Patent(Industrial Property Rights)] 三酸化二チタン質セラミックスバルク体およびその製造方法 (2016)
  • Inventor(s): 戸村信雄, 篠崎泰夫, 大瀧倫卓, 渡部 啓
  • Industrial Property Rights Holder: 戸村信雄, 篠崎泰夫, 大瀧倫卓, 渡部 啓
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2016-165798
  • Filing Date: 2016-08-26