首页|An advanced bifunctional single-element-incorporated ternary perovskite cathode for next-generation fuel cells

An advanced bifunctional single-element-incorporated ternary perovskite cathode for next-generation fuel cells

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© 2024 Elsevier B.V.Bifunctional perovskite oxides are widely considered to be promising cathode materials for the commercialization of fuel cells, with cobalt-rich variants traditionally preferred. However, challenges such as instability at elevated temperatures and high cost hinder their commercial viability. To address these issues, this study successfully develops a high-performance, cobalt-free ternary cathode material, Ba0.95Pr0.05FeO3-δ (BP5F), by substituting a small amount of Pr into the A-site of the perovskite parent BaFeO3-δ (BF), tailored for bifunctional applications in both solid oxide fuel cells (SOFCs) and protonic ceramic fuel cells (PCFCs). The incorporation of Pr not only optimizes the crystal phase structure but also enhances the oxygen vacancy concentration and triple-conducting capabilities of BP5F. Consequently, this cathode material exhibits remarkable electrocatalytic activity at intermediate-to-low temperatures (ILT, 400–700 °C), with ultra-low area specific resistances of just 0.028 and 0.134 Ω cm2 at 600 °C in symmetrical cells with oxygen ion- and proton-conducting electrolytes, respectively. Correspondingly, in single cells, the peak power densities reach up to 1.528 and 1.135 W cm−2. Furthermore, BP5F demonstrates exceptional long-term durability, operating stably for over 100 h at 600 °C in both SOFC and PCFC single cells. These performance metrics position BP5F among the best-performing ternary perovskite oxides to date. Experimental results combined with theoretical calculations validate the critical role of Pr, establishing BP5F as a highly promising and economically viable bifunctional candidate perovskite cathode, thus providing a significant step towards the commercial development of fuel cell technologies.

Bifunctional cathodeOxygen reduction reactionPerovskiteProtonic ceramic fuel cellSolid oxide fuel cell

Ye H.、Ye Q.、Li X.、Dong F.、Lin Z.、Wang Y.、Lin H.、Zhao B.、Ni M.

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Guangdong Provincial Key Laboratory of Plant Resources Biorefinery School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou Higher Education Mega Center

Guangdong Provincial Key Laboratory of Plant Resources Biorefinery School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou Higher Education Mega Center||Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center

Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology

School of Environment and Energy South China University of Technology

Department of Building and Real Estate Research Institute for Sustainable Urban Development (RISUD) & Research Institute for Smart Energy (RISE) The Hong Kong Polytechnic University||Guangdong Provincial Key Laboratory of Plant Resources Biorefinery School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou Higher Education Mega Center

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2025

10.1016/j.jpowsour.2024.235875

Journal of power sources

Journal of power sources

SCI
ISSN：0378-7753
年,卷(期)：2025.628(Feb.1)
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