材料科学
双金属片
法拉第效率
化学工程
过渡金属
纳米复合材料
催化作用
析氧
电催化剂
纳米技术
过电位
电化学
金属
吸附
物理化学
化学
电极
冶金
工程类
生物化学
作者
Qiang He,Dengsong Zhang,Haijing Li,Yang Yang,Shuai Chen,Wenjun Yan,Juncai Dong,Xian‐Ming Zhang,Xiujun Fan
出处
期刊:Small
[Wiley]
日期:2022-02-27
卷期号:18 (15): e2108034-e2108034
被引量:32
标识
DOI:10.1002/smll.202108034
摘要
Abstract Surface oxygen vacancies (V o ) regulation is an effective strategy to improve the electrochemical CO 2 reduction reaction (CO 2 RR) performance by lowering the activation energy barrier of CO 2 ; however, the lack of precise control over the local atomic structures severely hinders the large‐scale application of V o ‐activated electrocatalyst for CO 2 RR. Herein, an efficient strategy to facilitate CO 2 activation is developed by introducing V o into transition metal nanoparticles (NPs) with a steam‐assisted chemical vapor deposition method. With the steam process, abundant surface V o are introduced into the assembled Ni–Fe bimetallic NPs composite (H‐NiFe/NG), which adjust surface Ni/Fe atoms to low‐valent coordinatively unsaturated Ni (+1)/Fe (+2) sites, serving as electron‐rich centers to adsorb and activate inert CO 2 molecules. The as‐prepared H‐NiFe/NG composite exhibits excellent catalytic performance with a maximum Faradaic efficiency of 94% at −0.80 V (vs RHE) for CO production with remarkable stability. The density function theory calculations corroborate that the Ni atoms around surface V o significantly lower the energy barrier for COOH* intermediate formation, which gives a low overpotential for reducing CO 2 to CO, exhibiting superior CO 2 RR performance. This general synthetic strategy provides a new insight to introduce surface V o on transition metal for efficient CO 2 reduction.
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