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High current density SOFC with heterogenization of porous electrodes

Research Project

Project/Area Number 19H02077
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 19020:Thermal engineering-related
Research InstitutionKyoto University

Principal Investigator

Iwai Hiroshi  京都大学, 工学研究科, 教授 (00314229)

Co-Investigator(Kenkyū-buntansha) 岸本 将史  京都大学, 工学研究科, 准教授 (10757636)
吉田 英生  京都大学, 工学研究科, 教授 (50166964)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2021: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2020: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2019: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Keywords固体酸化物形燃料電池 / 多孔質電極 / ガス拡散 / 造孔材
Outline of Research at the Start

固体酸化物形燃料電池(SOFC)の燃料極微構造は数100nmまで微細化している。ガス拡散性を担保するため造孔材により直径数ミクロンのメゾスケール空隙が導入されるが、現状では造孔材の粒子径・量・分布に科学的な根拠は薄い。本研究はSOFCの多孔質燃料極において、不均一なメゾスケール空隙を科学的理解に基づいて能動的に取り入れることで高発電密度を実現することをめざす。精密な拡散実験と、多孔質微構造の解析、さらに構造データに基づく数値解析を実施し、燃料極内ガス輸送現象を解明することでSOFCの発電密度の向上を実現する。

Outline of Final Research Achievements

This study focuses on the counter-transport phenomena of hydrogen and steam in the porous fuel electrodes of solid oxide fuel cells. The influence of the discrete existence of relatively large pores formed by the pore-formers in the nanoscale pore structure, where the influence of Knudsen diffusion is strong, was studied by experiment, structural observation and quantification, and numerical analysis. As a result, a total pressure gradient in the direction of the fuel electrode thickness was experimentally demonstrated for the first time. Detailed numerical analysis based on three-dimensional structural data revealed that the relatively large pores caused by the pore-formers are effective for venting steam. On the other hand, hydrogen transport through the large pores tends to be suppressed by the total pressure gradient, while hydrogen transport through the relatively small pores is enhanced in such cases.

Academic Significance and Societal Importance of the Research Achievements

SOFCの多孔質燃料極において、造孔材由来の大空隙が水素と水蒸気の対向輸送に与える影響を精密な実験、大領域の構造観察とそれに基づく多孔質特徴量の定量化、詳細な数値解析で明らかにした。高効率な発電装置として期待されるSOFCの出力密度向上に資する結果である。また、造孔材による比較的大きなスケールの構造をもつ多孔質に対して、直交型FIB-SEMによる大領域観察を実現し、統計的に有意な多孔質特徴量の定量化に成功した。さらに、代替ガスの採用により、重要な現象を損なわず、かつ実際のSOFCの作動温度よりはるかに低い温度で実施可能な実験手法を確立しSOFCに関する実験的研究において新しい方向性を示した。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (16 results)

All 2022 2021 2020 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (15 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results)

  • [Journal Article] Effect fo total pressure difference on counter transport of gases with different molecular weights through solid oxide fuel cell anode2022

    • Author(s)
      Kento Sengoku, Masashi Kishimoto, Kohei Yamazaki, Hiroshi Iwai
    • Journal Title

      Journal of Power Sources

      Volume: 542 Pages: 231811-231811

    • DOI

      10.1016/j.jpowsour.2022.231811

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] SOFC燃料極における異なる分子量を持つ気体の対向輸送に対する全圧差の影響2022

    • Author(s)
      岸本将史,仙石健斗,岩井裕
    • Organizer
      第59回日本伝熱シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 固体酸化物形セルの水素極活性に及ぼす水蒸気分圧の影響評価2022

    • Author(s)
      中村理貴,岸本将史,岩井裕
    • Organizer
      第26回動力・エネルギー技術シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] SOFC燃料極多孔質体内に生じる対向ガス輸送現象に関する3次元数値解析2022

    • Author(s)
      山崎皓平,岸本将史,岩井裕
    • Organizer
      熱工学コンファレンス2022
    • Related Report
      2022 Annual Research Report
  • [Presentation] SOFC多孔質燃料極の空隙構造がガス輸送特性に及ぼす影響2022

    • Author(s)
      高木亮輔,岸本将史,岩井裕
    • Organizer
      日本機械学会関西学生会2021年度学生員卒業研究発表講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Bimodal pore-size distribution in solid oxide fuel cell anode and its effect on gas permeability2021

    • Author(s)
      Kohei Yamazaki, Masashi Kishimoto, Hiroshi Iwai
    • Organizer
      European Congress and Exhibition on Advanced Materials and Processes
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Porous Electrodes of Solid Oxide Fuel Cells -Correlation between Structure and Performance via Transport Phenomena and Reactions2021

    • Author(s)
      Hiroshi Iwai
    • Organizer
      European Congress and Exhibition on Advanced Materials and Processes
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Gas Transport with Total Pressure Difference in Solid Oxide Fuel Cell Anode Substrate2021

    • Author(s)
      Kento Sengoku, Masashi Kishimoto, Hiroshi Iwai
    • Organizer
      6th Asian SOFC Symposium and Exhibition
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] SOFC 燃料極における二峰性空隙構造の定量化と透過率への影響2021

    • Author(s)
      山崎皓平,岸本将史,岩井裕
    • Organizer
      第25回動力・エネルギー技術シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] SOFC 燃料極支持体中のガス輸送現象における全圧差の影響2021

    • Author(s)
      仙石建斗, 岸本将史, 岩井裕
    • Organizer
      第30回SOFC研究発表会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 高水蒸気分圧下におけるSOFC燃料極の性能評価とモデル化2020

    • Author(s)
      中村理貴、岸本将史、岩井 裕
    • Organizer
      日本機械学会関西支部 2020年度学生員卒業研究発表講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 3次元畳み込みニューラルネットワークを用いた球充填多孔質体の屈曲度ファクタの推定2020

    • Author(s)
      松井耀大、岸本 将史、岩井 裕
    • Organizer
      日本機械学会関西支部 2020年度学生員卒業研究発表講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Charge-transfer kinetics in nickel-yttria stabilized zirconia anode of solid oxide fuel cells covering high steam concentration condition: Experimental evaluation and elementary reaction modeling2020

    • Author(s)
      Masashi Kishimoto, Taichi Otsuka, Hiroshi Iwai, Hideo Yoshida
    • Organizer
      20th SNU-KU-THU Thermal Engineering Conference
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] SOFC 多孔質電極における有効ガス拡散係数の測定2020

    • Author(s)
      仙石建斗,岸本将史,岩井裕,齋藤元浩,吉田英生
    • Organizer
      日本機械学会関西支部 2019年度学生員卒業研究発表講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] SOFC多孔質燃料極におけるガス透過率の測定2019

    • Author(s)
      樋口和宏, 岸本将史,岩井裕,齋藤元浩,吉田 英生
    • Organizer
      第24回動力・エネルギー技術シンポジウム
    • Related Report
      2019 Annual Research Report
  • [Presentation] SOFC多孔質燃料極における造孔剤添加のガス輸送特性への影響2019

    • Author(s)
      山崎晧平,岸本将史,岩井裕,齋藤元浩,吉田英生
    • Organizer
      熱工学コンファレンス2019
    • Related Report
      2019 Annual Research Report

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Published: 2019-04-18   Modified: 2024-01-30  

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