Oxygen reduction kinetics of high performance BaCo_0.4Fe_0.4M_0.1Y_0.1O_3-δ (M = Mg, Zr) positrode for protonic ceramic fuel cells.

IF 5.9 2区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Communications Chemistry Pub Date : 2025-03-08 DOI:10.1038/s42004-025-01468-4

Hirofumi Sumi, Konosuke Watanabe, Aman Sharma, Masaya Fujioka, Hiroyuki Shimada, Yasunobu Mizutani, Md Saiful Alam, Isao Kagomiya

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Abstract

Protonic ceramic fuel cells (PCFCs) should exhibit high performance at intermediate temperatures in the range of 400-600 °C. To reduce the operating temperature, more active air electrodes (positrodes) are needed. In the present work, BaCo_0.4Fe_0.4Mg_0.1Y_0.1O_3-δ (BCFMY) is investigated as a positrode material for application in PCFCs as well as solid oxide fuel cells (SOFCs). For SOFCs, the polarization resistance ascribed to the oxygen reduction reaction is proportional to p_O2^-1/4 (p_O2: oxygen partial pressure), suggesting that the rate-determining process is the charge transfer on the mixed ionic-electronic conductors. For PCFCs, this polarization resistance is proportional to p_O2^-^1/2, suggesting that the rate-determining process is the oxygen dissociation. The total polarization resistance for the PCFCs using the BCFMY positrode is 0.066 Ωcm² at 600 °C, lower than that using the BaCo_0.4Fe_0.4Zr_0.1Y_0.1O_3-δ (BCFZY) positrode. The higher oxygen nonstoichiometry of BCFMY promotes the oxygen dissociation process on the PCFC positrode surface.

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质子陶瓷燃料电池（PCFC）应在 400-600 °C 的中间温度范围内表现出高性能。为了降低工作温度，需要更多的活性空气电极（正极）。本研究将 BaCo0.4Fe0.4Mg0.1Y0.1O3-δ （BCFMY）作为正极材料进行研究，以应用于 PCFC 和固体氧化物燃料电池（SOFC）。对于 SOFC，氧还原反应产生的极化电阻与 pO2-1/4 （pO2：氧分压）成正比，这表明决定速率的过程是离子电子混合导体上的电荷转移。对于 PCFC，该极化电阻与 pO2-1/2 成正比，表明决定速率的过程是氧解离。使用 BCFMY 正极的 PCFC 在 600 °C 时的总极化电阻为 0.066 Ωcm2，低于使用 BaCo0.4Fe0.4Zr0.1Y0.1O3-δ (BCFZY) 正极的 PCFC。BCFMY 较高的氧非全度促进了 PCFC 正极表面的氧解离过程。

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来源期刊

Communications Chemistry Chemistry-General Chemistry

CiteScore

7.70

自引率

1.70%

发文量

146

审稿时长

13 weeks

期刊介绍： Communications Chemistry is an open access journal from Nature Research publishing high-quality research, reviews and commentary in all areas of the chemical sciences. Research papers published by the journal represent significant advances bringing new chemical insight to a specialized area of research. We also aim to provide a community forum for issues of importance to all chemists, regardless of sub-discipline.