Hou Bingxue, Wang Xintao, Tang Rui, Zhong Wenqiang, Zhu Meiyu, Tan Zanxiong, Wang Chengcheng
Aviation Engineering Institute, Civil Aviation Flight University of China, Guanghan 618037, China.
Industrial Training Center (School of Entrepreneurship and Innovation), Shen Zhen Polytechnic University, Shenzhen 518055, China.
Materials (Basel). 2025 Jul 30;18(15):3569. doi: 10.3390/ma18153569.
The commercialization of proton-conducting fuel cells (PCFCs) is hindered by the limited electroactivity and durability of cathodes at intermediate temperatures ranging from 400 to 700 °C, a challenge exacerbated by an insufficient understanding of high-entropy perovskite (HEP) materials for oxygen reduction reaction (ORR) optimization. This study introduces an yttrium-doped HEP to address these limitations. A comparative analysis of CeYBaSrLaCaCoO (x = 0, 0.2; designated as CBSLCC and YBSLCC) revealed that yttrium doping enhanced the ORR activity, reduced the thermal expansion coefficient (19.9 × 10 K, 30-900 °C), and improved the thermomechanical compatibility with the BaZrCeYYbO electrolytes. Electrochemical testing demonstrated a peak power density equal to 586 mW cm at 700 °C, with a polarization resistance equaling 0.3 Ω cm. Yttrium-induced lattice distortion promotes proton adsorption while suppressing detrimental Co spin-state transitions. These findings advance the development of durable, high-efficiency PCFC cathodes, offering immediate applications in clean energy systems, particularly for distributed power generation.
在400至700°C的中温范围内，质子传导燃料电池（PCFC）的商业化受到阴极有限的电活性和耐久性的阻碍，而对用于氧还原反应（ORR）优化的高熵钙钛矿（HEP）材料的理解不足加剧了这一挑战。本研究引入了一种钇掺杂的HEP来解决这些限制。对CeYBaSrLaCaCoO（x = 0, 0.2；分别指定为CBSLCC和YBSLCC）的对比分析表明，钇掺杂增强了ORR活性，降低了热膨胀系数（19.9×10⁻⁶ K⁻¹，30 - 900°C），并改善了与BaZrCeYYbO电解质的热机械兼容性。电化学测试表明，在700°C时峰值功率密度等于586 mW cm⁻²，极化电阻等于0.3 Ω cm²。钇诱导的晶格畸变促进了质子吸附，同时抑制了有害的Co自旋态转变。这些发现推动了耐用、高效的PCFC阴极的开发，在清洁能源系统中具有直接应用，特别是用于分布式发电。
