阳极
催化作用
氨
吉布斯自由能
兴奋剂
金属
开路电压
功率密度
材料科学
吸附
电流密度
化学工程
无机化学
化学
冶金
电压
电极
热力学
有机化学
光电子学
工程类
电气工程
功率(物理)
物理化学
物理
量子力学
作者
Zijun Hu,Song Lu,Fumin Tang,Daijun Yang,Cunman Zhang,Dongdong Xiao,Pingwen Ming
标识
DOI:10.1016/j.apcatb.2023.122856
摘要
Anion exchange membrane-based direct ammonia fuel cells (AEM-DAFCs) have attracted increasing attention due to the advantages of ammonia. However, the high Pt loading in the anode substantially hampers the practical implementation of AEM-DAFCs. Herein, the Ni4Cu1Cox (x = 0, 0.5, 1.0, 1.5 and 2.0)-BP catalysts were prepared for the first time, achieving the best ammonia oxidation reaction (AOR) performance at x = 1.5. Density functional theory calculations reveal that such improvement is ascribed to the lowered adsorption energy and the Gibbs free energy of AOR intermediates as Co doping introduces electron aggregation around O atoms. The AEM-DAFC based on Ni4Cu1Co1.5-BP anode can deliver a peak power density (PPD) of 115.7 mW cm−2 and an open circuit voltage of 0.75 V at 80 °C. According to our knowledge, such PPD is the highest among precious metal-free electrodes-based AEM-DAFCs, showing that the Ni4Cu1Co1.5-BP is a promising candidate for anode catalyst in AEM-DAFCs.
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