硼
铜
氧气
无机化学
氧还原
氧化硼
兴奋剂
氧化物
化学
氧化铜
还原(数学)
材料科学
化学工程
电化学
冶金
电极
有机化学
几何学
数学
光电子学
物理化学
工程类
作者
Charles Q. Yang,Ruichen Wang,Yu Chen,Jinhua Xiao,Zhiwei Huang,Bihong Lv,Huawang Zhao,Xiaomin Wu,Guohua Jing
标识
DOI:10.1016/j.cej.2024.149710
摘要
Cu-based catalysts inevitably undergo surface reconstruction during the electrochemical carbon dioxide reduction reaction (CO2RR) process. Thus, it is a challenge to construct stable Cu+-Cu0 sites of Cu-based catalysts. In this study, we report a simple and facile engineering strategy for stable Cu+-Cu0 sites and oxygen defects derived from the boron-doped copper composite catalyst (B-CuxO) as an efficient CO2RR electrocatalyst. The 5 % B-CuxO exhibited 48.44 % C2+ products Faraday efficiency (FE) for 12 h at −1.0 V vs reversible hydrogen electrode (RHE) in H-cell, which was far superior to CuxO (23.85 %). Combining density functional theory (DFT) and in situ Attenuated Total Reflection Fourier Transform Infrared spectroscopy (in situ ATR-FTIR), a higher electronic depletion on the catalyst surface inhibited the electrons accumulation around Cu sites, thereby maintaining the positive charge and inhibiting the complete reduction of Cu+. Moreover, the high oxygen defects in 5 % B-CuxO could effectively activate CO2 into *CO. We emphasized that Cu+ functioned as the primary active site by facilitating adsorption and dimerization of *CO, whereas Cu0 assisted in optimizing CO2 activation.
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