首页|Modulating the degree of O vacancy defects to achieve selective control of electrochemical CO2 reduction products

Modulating the degree of O vacancy defects to achieve selective control of electrochemical CO2 reduction products

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Conversion of CO2 into high-value products using electrochemical CO2 reduction(ECR)technology is an effective way to alleviate global warming and reach carbon neutrality.The oxygen vacancies in heteroge-nous catalysis are generally considered as a powerful method to enhance the performance of ECR by promoting CO2 adsorption and activation.However,the extent of defects in oxygen vacancies-activity re-lation 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 de-gree can modulate the selectivity of ECR products.A low degree of oxygen defects(CuO)is generally associated with lower product Faraday efficiency(FEC2/FEC1 ≈ 114％),but overabundant oxygen vacancies(CuO2.625-CdO0.375)are not entirely favorable to improving ECR activity(FEC2/FEC1 ≈ 125％)and single se-lectivity,while an appropriate degree of oxygen vacancies(CuO2.75-CdO0.25)can facilitate the ECR process toward single product selective production(FEC2/FEC1≈ 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 pro-vides a new approach and insight into the selective production of single products for future industrial applications of ECR.

CO2O-vacanciesBimetallic catalystsCopper oxideCadmium oxideSelective

Tianbo Jia、Lili Wang、Zhouhao Zhu、Baikang Zhu、Yingtang Zhou、Guoxing Zhu、Mingshan Zhu、Hengcong Tao

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School of Petrochemical Engineering & Environment,Zhejiang Ocean University,Zhoushan 316022,China

Department of General Practice,First Medical Center,Chinese PLA General Hospital,Beijing 100853,China

National & Local Joint Engineering Research Center of Harbor Oil & Gas Storage and Transportation Technology,Zhoushan 316022,China

School of Chemistry and Chemical Engineering,Jiangsu University,Zhenjiang 212013,China

Guangdong Key Laboratory of Environmental Pollution and Health,School of Environment,Jinan University,Guangzhou 511443,China

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National Natural Science Foundation of Zhejiang ProvinceNational Natural Science Foundation of Zhejiang Province"Leading Goose"Research and Development Program of Zhejiang国家自然科学基金Science and Technological program of NingboOpen Research Subject of Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control

LQ21B030007LTGS23B0300022023C01191220052692021S1362022Z02

2024

10.1016/j.cclet.2023.108692

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(5)
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