氧还原反应
碳纤维
材料科学
多孔性
氧气
氧原子
Atom(片上系统)
还原(数学)
氧还原
化学工程
无机化学
纳米技术
物理化学
化学
分子
电化学
有机化学
复合材料
电极
几何学
数学
复合数
计算机科学
工程类
嵌入式系统
作者
Shilong Zhou,Chao Chen,Jiawei Xia,Le Li,Xingyue Qian,Fengxiang Yin,Guangyu He,Qun Chen,Haiqun Chen
出处
期刊:Small
[Wiley]
日期:2024-02-06
标识
DOI:10.1002/smll.202310224
摘要
Abstract Regulating the asymmetric active center of a single‐atom catalyst to optimize the binding energy is critical but challenging to improve the overall efficiency of the electrocatalysts. Herein, an effective strategy is developed by introducing an axial hydroxyl (OH) group to the Fe─N 4 center, simultaneously assisting with the further construction of asymmetric configurations by replacing one N atom with one S atom, forming FeN 3 S 1 ─OH configuration. This novel structure can optimize the electronic structure and d ‐band center shift to reduce the reaction energy barrier, thereby promoting oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic activities. The optimal catalyst, Fe SA ‐S/N‐C (FeN 3 S 1 ─OH anchored on hollow porous carbon) displays remarkable ORR performance with a half‐wave potential of 0.92, 0.78, and 0.64 V versus RHE in 0.1 m KOH, 0.5 m H 2 SO 4 , and 0.1 m PBS, respectively. The rechargeable liquid Zn–air batteries (LZABs) equipped with Fe SA ‐S/N‐C display a higher power density of 128.35 mW cm −2 , long‐term operational stability of over 500 h, and outstanding reversibility. More importantly, the corresponding flexible solid‐state ZABs (FSZABs@Fe SA ‐S/N‐C) display negligible voltage changes at different bending angles during the charging and discharging processes. This work provides a new perspective for the design and optimization of asymmetric configuration for single‐atom catalysts applied to the area of energy conversion and storage.
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