电催化剂
过电位
双功能
材料科学
化学工程
析氧
硫化钴
钴
碳纤维
电化学
无机化学
催化作用
化学
电极
冶金
复合材料
物理化学
有机化学
复合数
工程类
作者
Yujin Son,Kyeongseok Min,Sungkyun Cheong,Bo‐Young Lee,Sang Eun Shim,Sung‐Hyeon Baeck
标识
DOI:10.1002/advs.202407915
摘要
Abstract To realize the practical application of rechargeable Zn–Air batteries (ZABs), it is imperative to develop a non‐noble metal‐based electrocatalyst with high electrochemical performance for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Herein, Ni‐doped Co 9 S 8 nanoparticles dispersed on an inverse opal‐structured N, S co‐doped carbon matrix (IO─Ni x Co 9‐x S 8 @NSC) as a bifunctional electrocatalyst is presented. The unique 3D porous structure, arranged in an inverse opal pattern, provides a large active surface area. Also, the conductive carbon substrate ensures the homogeneous dispersion of Ni x Co 9‐x S 8 nanocrystals, preventing aggregation and increasing the exposure of active sites. The introduction of heteroatom dopants into the Co 9 S 8 structure generates defect sites and enhances surface polarity, thereby improving electrocatalytic performance in alkaline solutions. Consequently, the IO─Ni x Co 9‐x S 8 @NSC shows excellent bifunctional activity with a high half‐wave potential of 0.926 V for ORR and a low overpotential of 289 mV at 10 mA cm −2 for OER. Moreover, the rechargeable ZAB assembled with prepared electrocatalyst exhibits a higher specific capacity (768 mAh g Zn −1 ), peak power density (180.2 mW cm −2 ), and outstanding stability (over 160 h) compared to precious metal‐based electrocatalyst.
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