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Study of ion transport mechanism in ultra-thin electrolyte membrane for low temperature operation of solid oxide fuel cell

Research Project

Project/Area Number 18H01467
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 21050:Electric and electronic materials-related
Research InstitutionThe University of Tokyo (2020)
Tohoku University (2018-2019)

Principal Investigator

NIWA Masaaki  東京大学, 大学院工学系研究科(工学部), 上席研究員 (90608936)

Co-Investigator(Kenkyū-buntansha) 内山 潔  鶴岡工業高等専門学校, その他部局等, 教授 (80403327)
蓮沼 隆  筑波大学, 数理物質系, 准教授 (90372341)
西村 知紀  東京大学, 大学院工学系研究科(工学部), 技術専門職員 (10396781)
鳥海 明  東京大学, 大学院工学系研究科(工学部), 教授 (50323530)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2020: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2018: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
Keywords極薄電解質膜 / イオン伝導 / 電子伝導 / キャリア拡散 / 結晶構造 / 極薄YSZ膜 / 固体電解質材料 / 電解質膜 / 電解質膜中の電気伝導 / イオン電導 / 伝導キャリア / 高誘電率絶縁膜 / 酸素空孔 / インピーダンススペクトル / YSZ / 等価回路 / イオン輸送機構 / 薄膜測定 / 極薄電解質臨界膜厚 / 酸素イオン伝導機構
Outline of Final Research Achievements

The correlation between the crystal structure, Y2O3 concentration [Y], and ionic conductivity σ associated with the thinning of the YSZ film was examined. In bulk YSZ, σ is maximized when [Y] is about 8 mol%, however it was found that the [Y] showing the maximum σ was found to be a lower concentration for thin YSZ. For more details, the activation energy Δ of σ depends on the crystal structure of YSZ, and σ increases when [Y] < 8 mol%, however, the cubic structure stabilized due to the structural change from cubic to monoclinic phase, and Δ decreased with decreasing the [Y] even at low concentrations of 8 mol% or less.
In addition, since cubic YSZ depends on [Y] in the low temperature range (400 ℃) and is larger than the reported value in the high temperature range (1000℃), it is clear that the carrier diffusion inhibition mechanism differs between low and high temperature ranges.

Academic Significance and Societal Importance of the Research Achievements

固体酸化物燃料電池に低温動作化に向けた極薄電解質膜におけるイオン輸送機構の解明に向けて、イオン伝導を担う実効的なキャリア密度とその活性化エネルギーによって描像されるイオンの伝導機構を電解質材料の薄層化に伴う結晶構造変化を考慮して実験的に検証したことによって、キャリアの拡散阻害メカニズムが動作時の温度に依存して変化するという新しい知見を見出し、国際会議,国内会議や論文誌で発信したことは、低温動作化させる固体電解質材料はもとより、他の固体電解質材料に対する酸素分圧や歪み制御の為の薄膜多層構造やナノロッド構造など、YSZの応用展開にも極めて重要な指針を与えることができた。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (6 results)

All 2021 2020 2019 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results) Book (1 results) Remarks (1 results)

  • [Journal Article] Ion conductive character of low-yttria-content yttria-stabilized zirconia at low temperature2020

    • Author(s)
      Tomonori Nishimura, Toshiya Kojima, Kosuke Nagashio, Masaaki Niwa
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: SB Pages: SBBF03-SBBF03

    • DOI

      10.35848/1347-4065/abd6dc

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] 高対称相構造を有する低Y2O3濃度 YSZ 薄膜のイオン伝導特性2021

    • Author(s)
      西村知紀,小島俊哉,長汐晃輔,丹羽正昭
    • Organizer
      第26回 電子デバイス界面テクノロジー研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Ion conductivity of low-Y2O3-content yttria-stabilized zirconia2020

    • Author(s)
      Tomonori Nishimura, Toshiya Kojima, Kosuke Nagashio, Masaaki Niwa
    • Organizer
      2020 International Conference on Solid State Devices and Materials
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] YSZ極薄膜の高温インピーダンス解析2020

    • Author(s)
      西村知紀、小島俊哉、長汐晃輔、丹羽正昭
    • Organizer
      2020年第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Book] Advancing Technology2019

    • Author(s)
      Masaaki NIWA
    • Total Pages
      3
    • Publisher
      Science Impact (www.impact.pub)
    • Related Report
      2019 Annual Research Report
  • [Remarks] Solid-state fuel cells offer great potential

    • Related Report
      2020 Annual Research Report

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Published: 2018-04-23   Modified: 2022-01-27  

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