Unveiling the importance of the interface in nanocomposite cathodes for proton-conducting solid oxide fuel cells

Exploration (Beijing, China) Pub Date : 2024-02-01 DOI:10.1002/EXP.20230082

Yanru Yin, Yifan Wang, Nan Yang, Lei Bi

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Abstract

Designing a high-performance cathode is essential for the development of proton-conducting solid oxide fuel cells (H-SOFCs), and nanocomposite cathodes have proven to be an effective means of achieving this. However, the mechanism behind the nanocomposite cathodes' remarkable performance remains unknown. Doping the Co element into BaZrO₃ can result in the development of BaCoO₃ and BaZr_0.7Co_0.3O₃ nanocomposites when the doping concentration exceeds 30%, according to the present study. The construction of the BaCoO₃/BaZr_0.7Co_0.3O₃ interface is essential for the enhancement of the cathode catalytic activity, as demonstrated by thin-film studies using pulsed laser deposition to simulate the interface of the BCO and BZCO individual particles and first-principles calculations to predict the oxygen reduction reaction steps. Eventually, the H-SOFC with a BaZr_0.4Co_0.6O₃ cathode produces a record-breaking power density of 2253 mW cm⁻² at 700°C.

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揭示质子传导型固体氧化物燃料电池纳米复合阴极界面的重要性

设计高性能阴极对于质子传导型固体氧化物燃料电池（H-SOFC）的开发至关重要，而纳米复合阴极已被证明是实现这一目标的有效手段。然而，纳米复合阴极卓越性能背后的机理仍然未知。根据本研究，在 BaZrO3 中掺入钴元素，当掺入浓度超过 30% 时，就能形成 BaCoO3 和 BaZr0.7Co0.3O3 纳米复合材料。利用脉冲激光沉积模拟 BCO 和 BZCO 单个颗粒的界面，并通过第一性原理计算预测氧还原反应步骤，这些薄膜研究表明，BaCoO3/BaZr0.7Co0.3O3 界面的构建对于提高阴极催化活性至关重要。最终，采用 BaZr0.4Co0.6O3 阴极的 H-SOFC 在 700°C 温度下产生了破纪录的 2253 mW cm-2 功率密度。

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来源期刊

Exploration (Beijing, China)

CiteScore

17.20

自引率

0.00%

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