结晶度
化学
催化作用
电化学
二氧化碳电化学还原
电子转移
甲酸
炭黑
化学工程
选择性
无机化学
法拉第效率
电催化剂
碳纤维
氧化还原
合成气
电极
一氧化碳
材料科学
光化学
有机化学
物理化学
复合材料
天然橡胶
工程类
复合数
结晶学
作者
Yang Yue,Xiaohuan Zou,Yuande Shi,Jiannan Cai,Yuxuan Xiang,Zhongshui Li,Shen Lin
标识
DOI:10.1016/j.jelechem.2022.117089
摘要
Electrochemical method to convert CO2 into valuable industrial fuel or raw material is an important means to establish a new carbon cycle. However, low selectivity and poor stability of electrocatalysts seriously limited its potential application. In this paper, by the efficient integration of CuO and SnO2 on carbon black (C), a low crystallinity CuO-SnO2/C catalyst was synthesized, which exhibited drastically enhanced selectivity, activity and stability towards carbon dioxide reduction reaction (CO2RR). It is found that CuO and SnO2 nanoparticles are well distributed on carbon black carrier, resulting in larger value of the electrochemically active surface area (ECSA) and faster electron transfer capacity, which contributes to the enhanced electrocatalytic process. Especially, the obviously lower crystallinity of CuO on CuO-SnO2/C is in favor of the easier transfer of electron to CO2 surface to form the intermediate CO2·-, accelerating the reduction reaction. Therefore, as-obtained CuO-SnO2/C with low crystallinity efficiently catalyzes the reduction of CO2 to formic acid and syngas in a facile process, with the highest Faradaic efficiency (FE) of C1 products (HCOOH + CO) of 80 %, and 100 % FE can be utilized. The findings here present a novel way for crystallinity tuning of a material to efficiently manipulate its electrocatalytic properties towards CO2RR.
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