• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Investigation of the conduction mechanism of scheelite-type structured oxide ion conductors

Research Project

Project/Area Number 17K06016
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Inorganic industrial materials
Research InstitutionKyoto University

Principal Investigator

Takai Shigeomi  京都大学, エネルギー科学研究科, 准教授 (10260655)

Co-Investigator(Kenkyū-buntansha) 薮塚 武史  京都大学, エネルギー科学研究科, 助教 (20574015)
八尾 健  京都大学, エネルギー科学研究科, 名誉教授 (50115953)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2019: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywords酸化物イオン伝導体 / 欠陥構造 / 格子間酸化物 / 拡散 / 灰重石 / 中性子回折 / 導電パス / マキシマムエントロピー法 / 高温中性子回折 / 灰重石型構造 / 燃料電池電解質 / 結合原子価 / 酸素空孔 / 固体酸化物形燃料電池 / パルス中性子回折 / 導電機構 / 陽イオン空孔 / 酸化物イオン空孔 / 無機工業化学 / イオン伝導体 / 燃料電池 / 格子間酸化物イオン
Outline of Final Research Achievements

In the present study, we compared the scheelite-type structured PbWO4 and CaWO4-based oxide ion conductors in terms of defect structures. The former and the latter system utilizes the oxide ion interstitials and oxide ion vacancies, respectively for oxide ion conduction. We have at first established the oxide ion conduction of relatively new CaWO4-based system by means of electrochemical method. High-temperature neutron diffraction experiments were made to investigate the precise structure including defect structure and conduction path by means of Maximum Entropy Method. PbWO4-based system with the oxide ion interstitials possesses the conduction path through the interstitial sites within a-b plane and along c-axis, while CaWO4-based system with oxide ion vacancy shows the diffusion path along c-axis. BVS calculation has less information for defect structure.

Academic Significance and Societal Importance of the Research Achievements

固体酸化物形燃料電池の性能は固体電解質よって決まり,様々なイオン伝導体の研究が行われている.従来の酸化物イオン伝導体は主に空孔を利用したものであるが,近年は中温領域で稼働する系の研究も活発になっており,格子間酸化物イオンが伝導に寄与する系も注目されるようになってきている.PbWO4およびCaWO4はいずれも灰重石型構造を示す酸化物イオン伝導体になり得るが,異なる欠陥構造のメカニズムでイオン伝導を引き起こす.本研究によって欠陥構造とイオン伝導の関連について新たな知見が得られたことにより,今後の燃料電池材料の開発に大きく寄与できたと考えられる.

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (17 results)

All 2020 2019 2018 2017 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (13 results) (of which Int'l Joint Research: 6 results) Remarks (3 results)

  • [Journal Article] Defect Structure and Oxide Ion Conduction of Potassium Ion Substituted CaWO42018

    • Author(s)
      Takai Shigeomi、Shitaune Shinya、Sano Toshifumi、Kawaji Hitoshi、Yabutsuka Takeshi、Esaka Takao、Yao Takeshi
    • Journal Title

      Materials

      Volume: 11 Issue: 7 Pages: 1092-1092

    • DOI

      10.3390/ma11071092

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Ca1-xCsxWO4-x/2系酸化物イオン伝導体の中性子回折2020

    • Author(s)
      陳恒,高井茂臣,薮塚武史,八尾健
    • Organizer
      電気化学会第87回大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] CaWO4を母体とした酸化物イオン伝導体の導電特性2019

    • Author(s)
      高井茂臣,佐野稔文,鍛治宗騎,薮塚武史,八尾 健
    • Organizer
      第14回日本セラミックス協会関西支部学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Difference in Oxide Ion Conduction Properties of Oxide Ion Excess and Cation Deficient PbWO4s and Oxide Ion Deficient CaWO42019

    • Author(s)
      S. Takai, T. Sano, T. Yabutsuka, T. Yao
    • Organizer
      236th ECS Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Contribution of Defect Structure on Conduction Process for Scheelite-Type Oxide Ion Conductors2019

    • Author(s)
      S. Takai, T. Sano, T. Yabutsuka, T. Yao
    • Organizer
      The Seventh International Symposium on the New Frontiers of Thermal Studies of Materials
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] イオン伝導体Ca1-xCsxWO4-x/2 (x=0.1) の高温中性子回折2019

    • Author(s)
      陳恒,高井茂臣,薮塚武史
    • Organizer
      2019年度第3回関西電気化学研究会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Oxide Ion Conduction Pathways for PbWO4 and CaWO4-based Ion Conductors with Scheelite-type Structure2019

    • Author(s)
      Toshifumi Sano, Takeshi Yabutsuka, Shigeomi Takai, Takeshi Yao
    • Organizer
      Ajou-Kyoto-Zhejiang Joint Symposium on Energy Science
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Ca1-xKxWO4-x/2 (x=0.1) 酸化物イオン伝導体の高温中性子回折2018

    • Author(s)
      佐野稔文、高井茂臣、薮塚武史、八尾 健
    • Organizer
      2018年電気化学秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 灰重石型PbWO4およびCaWO4系酸化物イオン伝導体のイオン伝導経路2018

    • Author(s)
      佐野稔文、鍛治宗騎、高井茂臣、薮塚武史、八尾 健
    • Organizer
      第44回固体イオニクス討論会
    • Related Report
      2018 Research-status Report
  • [Presentation] High-Temperature Neutron Diffraction and Oxide Ion Conduction Path for Pb1-xLa2x/3WO42018

    • Author(s)
      Toshifumi Sano, Shigeomi Takai, Souki Kaji, Beijia Tong, Takeshi Yabutsuka, Takeshi Yao
    • Organizer
      233rd ECS Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Defect Structure and Oxide Ion Conduction of Potassium Ion Substituted CaWO42018

    • Author(s)
      Shigeomi Takai, Shinya Shitaune, Toshifumi Sano, Hitoshi Kawaji, Takeshi Yabutsuka, Takao Esaka, Takeshi Yao
    • Organizer
      The 14th Eco-Energy and Materials Science and Engineering Symposium
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] High-Temperature Neutron Diffraction Study on PbWO4 and CaWO4-Based Oxide Ion Conductors with Different Defect Structure2017

    • Author(s)
      higeomi Takai, Souki Kaji, Takeshi Yabutsuka, Takeshi Yao
    • Organizer
      232nd ECS Meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] PbWO4系酸化物イオン伝導体の格子間酸化物イオン分布と導電機構2017

    • Author(s)
      高井茂臣、鍛治宗騎、村上正和、植松将慶、薮塚武史、八尾 健
    • Organizer
      第58回電池討論会
    • Related Report
      2017 Research-status Report
  • [Presentation] 酸化物イオン伝導体Pb1-xLa2x/3WO4 (x=0.1) の高温中性子回折2017

    • Author(s)
      佐野稔文、高井茂臣、鍛治宗騎、童 貝加、薮塚武史、八尾 健
    • Organizer
      第43回固体イオニクス討論会
    • Related Report
      2017 Research-status Report
  • [Remarks] 研究内容|京都大学大学院エネルギー科学研究科 機能固体化学分野

    • URL

      http://fssc.energy.kyoto-u.ac.jp/research.html

    • Related Report
      2019 Annual Research Report
  • [Remarks]

    • URL

      http://fssc.energy.kyoto-u.ac.jp/research.html

    • Related Report
      2018 Research-status Report
  • [Remarks] 構造欠陥が導くイオン伝導の世界

    • URL

      http://research.kyoto-u.ac.jp/academic-day/2017/shigeomi_takai/

    • Related Report
      2017 Research-status Report

URL: 

Published: 2017-04-28   Modified: 2021-02-19  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi