电催化剂
双功能
过电位
双金属片
材料科学
析氧
催化作用
锌
电解质
化学工程
氧气
钴
电池(电)
金属
氧化还原
电极
物理化学
化学
冶金
电化学
有机化学
功率(物理)
工程类
物理
量子力学
作者
Xiang Ao,Linfeng Li,So Yeon Yun,Yong Deng,Woosik Yoon,Peixing Wang,Xiaoyan Jin,Liming Dai,Chundong Wang,Seong‐Ju Hwang
出处
期刊:Nano Energy
[Elsevier]
日期:2023-09-29
卷期号:118: 108952-108952
被引量:7
标识
DOI:10.1016/j.nanoen.2023.108952
摘要
The bifunctional oxygen electrocatalyst acts as a key component for zinc−air batteries; however, the design of economically-feasible bifunctional electrocatalysts showing outstanding functionality and durability remains challenging. Herein, we report the preparation of homogeneously scattered dual Fe−Ni atomic pairs stabilized in porous N-doped carbon matrix with a hierarchically porous nanoarchitecture (denoted as FeNi-NHC), wherein the atomically isolated bimetallic configuration is verified by combinative investigation of microscopy, spectroscopy, and theoretical computations. As an oxygen electrocatalyst in a basic electrolyte, FeNi-NHC exhibits an exceptional activity, achieving an outstanding half-wave potential (0.934 V vs. RHE) for oxygen reduction reaction, and a small overpotential for oxygen evolution reaction (254 mV at 10 mA cm-2). Furthermore, the zinc–air battery constructed with FeNi-NHC catalyst delivers an excellent functionality featuring a high maximum power density (126 mW cm-2) and insignificant activity decay after 200 charge−discharge cycles. Theoretical computations further reveal that the interaction effect of neighboring metal atoms in the bimetallic Fe−Ni sites energetically promotes the catalytic process by reducing the overall reaction barriers via optimization of adsorption−desorption behaviors.
科研通智能强力驱动
Strongly Powered by AbleSci AI