Zhang Weilin, Zhou Yucun, Hu Xueyu, Ding Yong, Gao Jun, Luo Zheyu, Li Tongtong, Kane Nicholas, Yu Xiao-Ying, Terlier Tanguy, Liu Meilin
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States.
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States.
ACS Energy Lett. 2023 Sep 1;8(10):3999-4007. doi: 10.1021/acsenergylett.3c01251. eCollection 2023 Oct 13.
Reversible proton-conducting solid oxide cells (R-PSOCs) have the potential to be the most efficient and cost-effective electrochemical device for energy storage and conversion. A breakthrough in air electrode material development is vital to minimizing the energy loss and degradation of R-PSOCs. Here we report a class of triple-conducting air electrode materials by judiciously doping transition- and rare-earth metal ions into a proton-conducting electrolyte material, which demonstrate outstanding activity and durability for R-PSOC applications. The optimized composition BaPrHfYCoO (BPHYC) consists of three phases, which have a synergistic effect on enhancing the performance, as revealed from electrochemical analysis and theoretical calculations. When applied to R-PSOCs operated at 600 °C, a peak power density of 1.37 W cm is demonstrated in the fuel cell mode, and a current density of 2.40 A cm is achieved at a cell voltage of 1.3 V in the water electrolysis mode under stable operation for hundreds of hours.
可逆质子传导固体氧化物电池（R-PSOCs）有潜力成为用于能量存储和转换的最高效且最具成本效益的电化学装置。空气电极材料开发方面的突破对于将R-PSOCs的能量损失和性能退化降至最低至关重要。在此，我们报告了一类通过将过渡金属离子和稀土金属离子明智地掺杂到质子传导电解质材料中而得到的三导电空气电极材料，这些材料在R-PSOCs应用中表现出出色的活性和耐久性。优化后的成分BaPrHfYCoO（BPHYC）由三个相组成，电化学分析和理论计算表明，它们在增强性能方面具有协同效应。当应用于在600℃下运行的R-PSOCs时，在燃料电池模式下展现出1.37 W cm的峰值功率密度，在水电解模式下，在1.3 V的电池电压下实现了2.40 A cm的电流密度，并且能够稳定运行数百小时。
