Multi-metal (Fe, Cu, and Zn) coordinated hollow porous dodecahedron nanocage catalyst for oxygen reduction in Zn–air batteries†

IF 3.2 Q2 CHEMISTRY, PHYSICAL
Energy advances Pub Date : 2024-09-05 DOI:10.1039/D4YA00295D
Yanan Pan, Qi Yang, Xiaoying Liu, Fan Qiu, Junjie Chen, Mengdie Yang, Yang Fan, Haiou Song and Shupeng Zhang
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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.

Abstract Image

多金属(铁、铜、锌)配位空心多孔十二面体纳米笼催化剂可降低锌-空气电池中的氧气含量
低成本、多金属和多孔纳米碳材料的耦合,旨在替代贵金属增强电催化氧还原,是一些关键研究面临的重要挑战。本文利用 ZIF-8 的配位和铜、铁离子的掺杂,通过烧结退火后支撑铜纳米团簇、Fe3O4 纳米粒子和 Zn-NX 构建了十二面体空心纳米笼催化剂(Fe3O4/CuNCs/ZnNx-PHNC)。我们观察到,磁性可分离异质结催化剂中多金属的协同作用诱导了电子转移,抑制了过氧化氢的形成,从而提高了其对氧还原反应的催化性能。其半波电位高达 0.832 V,塔菲尔斜率为 54 mV/decade,优于文献中的许多非贵金属催化剂。组装后的锌空气电池(ZAB)的最大功率密度为 162 mW⸱cm-2,在 5 mA⸱cm-2电流密度条件下可保持 500 小时的超高稳定性。ZAB 的卓越性能也证明了其极高的开发和实际应用前景。
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CiteScore
1.80
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