Development of equivalent circuit analysis method for multi-carrier-conductor/electrode systems

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02796
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
• Research Institution: Tohoku University
• Principal Investigator: Kawada Tatsuya 東北大学, 環境科学研究科, 教授 (10271983)
• Co-Investigator(Kenkyū-buntansha): 八代 圭司 東北大学, 環境科学研究科, 准教授 (20323107)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: プロトン導電体 / 混合導電体 / 等価回路 / マルチキャリア / 固体酸化物形燃料電池

Outline of Final Research Achievements

Transport properties of proton-conducting oxides, which are expected as electrolytes for high efficiency fuel cells, are affected by the mobile holes and oxide ions. An equivalent circuit model was proposed to enable simple evaluation of their behaviors using a general-purpose circuit simulator. A surrogate model with the gas-solid exchange resistances of hydrogen, water vapor, and oxygen as parameters was developed for a fast search for combinations of electrode resistances that reproduce the experimental results. Transport constants which are necessary for the calculation were measured, and the calculated results were experimentally verified.

Free Research Field

固体電気化学

Academic Significance and Societal Importance of the Research Achievements

プロトン導電性酸化物を電解質とする燃料電池は80%以上の発電効率を達成し得るとの試算がありNEDO事業等の実用化研究が盛んに行われているが，その挙動の複雑さから，性能を正しく評価するために数値計算が必要であり，研究開発の障壁のひとつとなっている。この系を等価回路で表すことで一般的な回路シミュレータソフトを使った計算が可能になり，開発促進に資する他，挙動と現象の対応がグラフィカルに理解できるようになる。