期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 334, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2023.122856
关键词
Anion exchange membrane; Direct ammonia fuel cells; Ni-Cu-Co ternary catalyst; Ammonia oxidation reaction; DFT simulation
Anion exchange membrane-based direct ammonia fuel cells (AEM-DAFCs) have attracted attention due to the advantages of ammonia. However, high Pt loading in the anode limits their practical implementation. In this study, Ni4Cu1Cox (x = 0, 0.5, 1.0, 1.5 and 2.0)-BP catalysts were prepared and the best ammonia oxidation reaction (AOR) performance was achieved at x = 1.5. The AEM-DAFC based on Ni4Cu1Co1.5-BP anode showed the highest peak power density (PPD) among precious metal-free electrodes-based AEM-DAFCs, making it a promising candidate for anode catalyst in AEM-DAFCs.
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 func-tional 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 degrees 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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