石墨烯
杂原子
过电位
电催化剂
析氧
材料科学
密度泛函理论
电子转移
电子结构
化学工程
纳米技术
化学
电化学
光化学
计算化学
电极
物理化学
有机化学
工程类
戒指(化学)
作者
Changlai Wang,Huigang Tong,Jian Lu,Bin Liu,Fangcai Zheng,Tao Wen,Wenjun Zhang,Qianwang Chen
出处
期刊:Carbon
[Elsevier]
日期:2020-12-01
卷期号:170: 414-420
被引量:26
标识
DOI:10.1016/j.carbon.2020.08.041
摘要
Graphene is electrochemically inert toward the oxygen evolution reaction (OER) owing to the zero-band property, nevertheless doping it with heteroatoms could modulate its electronic structure and increase its chemical reactivity. Notwithstanding the achieved progress, the overpotential of heteroatom doped graphene is still very large. Herein, we coat FeNiIr nanoalloys by nitrogen-doped graphene with core-shell structure ([email protected]) to further boost the OER activity on graphene surface. Because of the unique core-shell structure, [email protected] delivers high electrocatalytic OER activity and durability, even exceeding that of commercial IrO2 electrocatalyst. Density functional theory calculations demonstrate that the nanoalloys core could transfer electron to outer graphene shells, which optimizes the electronic structure of graphene and balances the adsorption strength of OER intermediates, thereby triggering OER activity on the graphene surface.
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