期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 14, 期 7, 页码 1740-1747出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c03835
关键词
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PtNi nanoalloys dispersed on N-doped carbon frameworks were prepared through a simple pyrolysis strategy to form PtNi/NC catalyst. The PtNi/NC catalyst exhibited excellent ORR activity and stability due to the individual components and hierarchical structure. Charge redistribution and a suitable metal dband center were found to enhance the formation of ORR intermediates and improve the ORR activity of PtNi nanoalloys.
PtNi nanoalloys have demonstrated electrocatalysis superior to that of benchmark Pt/C catalysts for the oxygen reduction reaction (ORR), yet the underlying mechanisms remain underexplored. Herein, a PtNi/NC catalyst comprising PtNi nanoparticles (similar to 5.2 nm in size) dispersed on N-doped carbon frameworks was prepared using a simple pyrolysis strategy. Benefiting from the individual components and a hierarchical structure, the PtNi/NC catalyst exhibited outstanding ORR activity and stability (E1/2 = 0.82 V vs RHE and 8 mV negative shift after 20000 cycles), outperforming a commercial 20 wt % Pt/C catalyst (E1/2 = 0.81 V and 32 mV negative shift). A prototype zinc-air battery constructed using PtNi/NC as the air electrode catalyst achieved highly enhanced electrochemical performance, outperforming a battery constructed using Pt/C as the ORR catalyst. Density functional theory calculations revealed that the improved ORR activity of the PtNi nanoalloys originated from charge redistribution with a suitable metal dband center to promote the formation of the ORR intermediates.
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