过电位
法拉第效率
催化作用
可逆氢电极
材料科学
纳米颗粒
电化学
杂原子
碳纤维
电催化剂
化学工程
无机化学
氧化物
纳米技术
电极
化学
复合数
工作电极
有机化学
冶金
工程类
物理化学
复合材料
戒指(化学)
作者
Zhengpei Miao,Pei Hu,Chuanye Nie,Huan Xie,Wenli Fu,Qing Li
标识
DOI:10.1016/j.jechem.2019.01.010
摘要
Electrochemical reduction of CO2 to produce value-added feedstock chemicals using high-performance electrocatalysts is a promising protocol to address the excessive CO2 in the atmosphere and the energy crisis. However, the high overpotential, low current density, and poor product selectivity for CO2 electroreduction greatly impede their practical applications. In this work, we develop an efficient catalyst for CO2 reduction to CO consisting of well-dispersed ZrO2 nanoparticles tightly anchored on nitrogen-doped carbon nanosheets (ZrO2/N-C) for the first time. Importantly, the ZrO2 nanoparticles possess oxygen vacancies and defects, which regulate the electronic structure of catalyst and thus greatly enhance the electrocatalytic activity. Specifically, ZrO2/N-C demonstrates a high CO Faradaic efficiency (FE) of 64% at −0.4 V vs. the reversible hydrogen electrode (RHE) and a respectable current density of ∼2.6 mA cm−2 in CO2-saturated 0.5 M KHCO3 solution. This work opens a new avenue for developing excellent catalysts for CO2 electroreduction with metal oxide/heteroatom-doped carbon composite structure.
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