过电位
电催化剂
法拉第效率
密度泛函理论
电导率
材料科学
电化学
化学
氧化物
催化作用
纳米棒
铟
电流密度
无机化学
化学工程
物理化学
纳米技术
电极
计算化学
光电子学
冶金
工程类
物理
量子力学
生物化学
作者
Chen Qiu,Kun Qian,Jun Yu,Mingzi Sun,Shoufu Cao,Jinqiang Gao,Rongxing Yu,Lingzhe Fang,Youwei Yao,Xiaoqing Lü,Tao Li,Bolong Huang,Shihe Yang
标识
DOI:10.1007/s40820-022-00913-6
摘要
For electrochemical CO2 reduction to HCOOH, an ongoing challenge is to design energy efficient electrocatalysts that can deliver a high HCOOH current density (JHCOOH) at a low overpotential. Indium oxide is good HCOOH production catalyst but with low conductivity. In this work, we report a unique corn design of In2O3-x@C nanocatalyst, wherein In2O3-x nanocube as the fine grains dispersed uniformly on the carbon nanorod cob, resulting in the enhanced conductivity. Excellent performance is achieved with 84% Faradaic efficiency (FE) and 11 mA cm-2 JHCOOH at a low potential of - 0.4 V versus RHE. At the current density of 100 mA cm-2, the applied potential remained stable for more than 120 h with the FE above 90%. Density functional theory calculations reveal that the abundant oxygen vacancy in In2O3-x has exposed more In3+ sites with activated electroactivity, which facilitates the formation of HCOO* intermediate. Operando X-ray absorption spectroscopy also confirms In3+ as the active site and the key intermediate of HCOO* during the process of CO2 reduction to HCOOH.
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