Yanan Pan, Qi Yang, Xiaoying Liu, Fan Qiu, Junjie Chen, Mengdie Yang, Yang Fan, Haiou Song and Shupeng Zhang
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引用次数: 0
Abstract
The coupling of multiple low-cost metals and porous nanocarbon materials aimed at replacing precious metals to enhance electrocatalytic oxygen reduction is a critical challenge in some crucial research areas. In the present study, a hollow dodecahedron nanocage catalyst (Fe3O4/CuNCs/ZnNx-PHNC) was constructed by supporting copper nanoclusters, Fe3O4 nanoparticles, and Zn–Nx after sintering and annealing through the coordination of ZIF-8 and by doping copper and iron ions. We observed that the synergy of the multi-metals in the magnetically separable heterojunction catalyst induced electron transfer and inhibited hydrogen peroxide formation, thus improving its catalytic performance for the oxygen-reduction reaction. The catalyst demonstrated a half-wave potential as high as 0.832 V and a Tafel slope of 54 mV decade−1, superior to many non-precious metal catalysts reported in the literature. The assembled Zn–air battery (ZAB) exhibited a maximum power density of 162 mW cm−2 and ultrahigh stability of >500 h at 5 mA cm−2 current density. The ZAB's excellent performance indicates its high development and practical application prospects.