Efficient electroreduction of carbon dioxide to formate enabled by bismuth nanosheets enriched dual V^(0)_(Bi)vacancy  

作　　者：Yuxin Xie Chen Wang Yuli Chen Huawang Zhao Guohua Jing Bihong Lv 

机构地区：[1]Department of Environmental Science&Engineering,College of Chemical Engineering,Huaqiao University,Xiamen,Fujian 361021,China

出　　处：《Journal of Environmental Sciences》2025年第4期267-276,共10页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.22276064 and 22278168);the Open Research Fund of Academy of Advanced Carbon Conversion Technology of Huaqiao University(No.AACCT0003);the Science and Technology Project of Fujian province(No.2022Y3007).

摘　　要：The electrocatalytic reduction of carbon dioxide(CO_(2)ER)into formate presents a compelling solution for mitigating dependence on fossil energy and green utilization of CO_(2).Bismuth(Bi)has been gaining recognition as a promising catalyst material for the CO_(2)ER to formate.The performance of Bi catalysts(named as Bi-V)can be significantly improved when they possess single metal atom vacancy.However,creating larger-sized metal atom vacancies within Bi catalysts remains a significant challenge.In this work,Bi nanosheets with dual V0 Bi vacancy(Bi-DV)were synthesized utilizing in situ electrochemical transformation,using BiOBr nanosheets with triple vacancy associates(V■_(Bi)V··_(O)V■_(Bi),V■_(Bi)and V··_(O)denote the Bi^(3+)and O_(2)−vacancy,respectively)as a template.The obtained Bi-DV achieved higher CO_(2)ER activity than Bi-V,showing Faradaic efficiency for formate production of>92%from-0.9 to-1.2 VRHE in an H-type cell,and the partial current density of formate reached up to 755 mA/cm^(2)in a flow cell.The comprehensive characterizations coupled with density functional theory calculations demonstrate that the dual V^(0)_(Bi)vacancy on the surface of Bi-DV expedite the reaction kinetics toward CO_(2)ER,by reducing the thermodynamic barrier of^(∗)OCHO intermediate formation.This research provides critical insights into the potential of large atom vacancies to enhance electrocatalysis performance.

关 键 词：BISMUTH CO_(2)electrocatalytic reduction Vacancy associates FORMATES 

分 类 号：O64[理学—物理化学]