2021 Fiscal Year Final Research Report
Fabrication of asymmetric ceramic porous anode of solid oxide fuel cells for ultra-high fuel utilization operation
| Project/Area Number |
19K14907
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 19020:Thermal engineering-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 固体酸化物形燃料電池 / 相転換法 / 異方性空隙 / ガス拡散 |
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| Outline of Final Research Achievements |
Phase-inversion tape-casting has been applied to the fabrication of solid oxide cell (SOC) to introduce asymmetric pore structures in the hydrogen electrode. The introduced pore structures are found to improve gas transport property of the hydrogen electrode, resulting in significant reduction of the gas diffusion resistance and of the asymmetric behavior of the SOCs between fuel-cell and electrolysis operation modes. Detailed microstructural analysis of the asymmetric pore structures is performed using scanning electron microscopy to quantitatively compare the structures with those of the conventional porous hydrogen electrode. In addition, electrochemical activity of the hydrogen electrode under various hydrogen concentration is experimentally investigated and modeled. GDC nano-particles are introduced in the hydrogen electrode to further reduce the asymmetric behavior of the cell. From these investigations, useful insights have been obtained to realize reversible operation of SOCs.
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| Free Research Field |
熱工学
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| Academic Significance and Societal Importance of the Research Achievements |
SOCは水素を用いて高効率な発電ができるだけでなく，電力から水素を製造することもできるため，水素社会を実現するうえで重要な要素のひとつである．本研究で検討した相転換法をSOC作製に適用することで，SOCにおけるガス輸送抵抗の大幅な低減や，発電―電解運転間の非対称性挙動を抑制することに成功し，SOCの高効率運転やリバーシブル運転を実現するための重要な知見を得た．また，相転換法によって形成される非対称な空隙構造を定量的に解析し，従来の多孔質構造に対する優位性を定量的に示したことにも学術的意義がある．
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