催化作用
电催化剂
材料科学
吸附
Atom(片上系统)
析氧
纳米技术
碳纤维
化学工程
物理化学
化学
电极
电化学
有机化学
复合数
工程类
嵌入式系统
复合材料
计算机科学
作者
Shilong Zhou,Chao Chen,Jiawei Xia,Le Li,Xingyue Qian,Muhammad Arif,Fengxiang Yin,Dai Guo-hong,Guangyu He,Qun Chen,Haiqun Chen
出处
期刊:Small
[Wiley]
日期:2023-08-18
卷期号:19 (48): e2302464-e2302464
被引量:27
标识
DOI:10.1002/smll.202302464
摘要
The development of innovative and efficient Fe-N-C catalysts is crucial for the widespread application of zinc-air batteries (ZABs), where the inherent oxygen reduction reaction (ORR) activity of Fe single-atom sites needs to be optimized to meet the practical application. Herein, a three-dimensional (3D) hollow hierarchical porous electrocatalyst (ZIF8@FePMPDA-920) rich in asymmetric Fe-N4 -OH moieties as the single atomic sites is reported. The Fe center is in a penta-coordinated geometry with four N atoms and one O atom to form Fe-N4 -OH configuration. Compared to conventional Fe-N4 configuration, this unique structure can weaken the adsorption of intermediates by reducing the electron density of the Fe center for oxygen binding, which decreases the energy barrier of the rate-determining steps (RDS) to accelerate the ORR and oxygen evolution reaction (OER) processes for ZABs. The rechargeable liquid ZABs (LZABs) equipped with ZIF8@FePMPDA-920 display a high power density of 123.11 mW cm-2 and a long cycle life (300 h). The relevant flexible all-solid-state ZABs (FASSZABs) also display outstanding foldability and cyclical stability. This work provides a new perspective for the structural design of single-atom catalysts in the energy conversion and storage areas.
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