Modulating the degree of O vacancy defects to achieve selective control of electrochemical CO_(2) reduction products  

作　　者：Tianbo Jia Lili Wang Zhouhao Zhu Baikang Zhu Yingtang Zhou Guoxing Zhu Mingshan Zhu Hengcong Tao 

机构地区：[1]School of Petrochemical Engineering&Environment,Zhejiang Ocean University,Zhoushan 316022,China [2]Department of General Practice,First Medical Center,Chinese PLA General Hospital,Beijing 100853,China [3]National&Local Joint Engineering Research Center of Harbor Oil&Gas Storage and Transportation Technology,Zhoushan 316022,China [4]School of Chemistry and Chemical Engineering,Jiangsu University,Zhenjiang 212013,China [5]Guangdong Key Laboratory of Environmental Pollution and Health,School of Environment,Jinan University,Guangzhou 511443,China

出　　处：《Chinese Chemical Letters》2024年第5期482-486,共5页中国化学快报（英文版）

基　　金：funded by the National Natural Science Foundation of Zhejiang Province(Nos.LQ21B030007 and LTGS23B030002);“Leading Goose”R&D Program of Zhejiang(No.2023C01191);the National Natural Science Foundation of China(No.22005269);Science and Technological program of Ningbo(No.2021S136);The Open Research Subject of Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control(No.2022Z02)。

摘　　要：Conversion of CO_(2) into high-value products using electrochemical CO_(2) reduction(ECR)technology is an effective way to alleviate global warming and reach carbon neutrality.The oxygen vacancies in heterogenous catalysis are generally considered as a powerful method to enhance the performance of ECR by promoting CO_(2) adsorption and activation.However,the extent of defects in oxygen vacancies-activity relation has rarely been studied.Herein,we prepared Cu-Cd bimetallic catalysts with adjustable oxygen defect degree by controlling the amount of cadmium addition.Fourier transform infrared spectroscopy characterization results reveal that the formation of oxygen vacancies is attributed to the asymmetric stretching of Cu-O by the addition of cadmium.Electrochemical results show that the oxygen defect degree can modulate the selectivity of ECR products.A low degree of oxygen defects(CuO)is generally associated with lower product Faraday efficiency(FE_(C2)/FE_(C1)≈114%),but overabundant oxygen vacancies(CuO_(2.625)-CdO_(0.375))are not entirely favorable to improving ECR activity(FE_(C2)/FE_(C1)≈125%)and single selectivity,while an appropriate degree of oxygen vacancies(CuO_(2.75)-CdO_(0.25))can facilitate the ECR process toward single product selective production(FE_(C2)/FE_(C1)≈296%).The theoretical calculation showed that the O vacancy formed on CuO and the interface between CdO and CuO were conducive to enhancing the formation of ^(*)COOH intermediate and promoting the generation of ethylene products.This study provides a new approach and insight into the selective production of single products for future industrial applications of ECR.

关 键 词：CO_(2) O-vacancies Bimetallic catalysts Copper oxide Cadmium oxide SELECTIVE 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学]