缺陷CuAg催化剂的构筑及电催化CO2还原制备C2+产物
Preparation of Defect Sites Rich CuAg Catalyst for CO2 Reduction to C2+Products
井慧芳 1刘毅 1房强 1郎学磊 1郝根彦 2钟达忠 1李晋平 1赵强1
作者信息
- 1. 太原理工大学化学工程与技术学院,气体能源高效清洁利用山西省重点实验室,太原 030024
- 2. 山西工学院能源工程学院,朔州 036000
- 折叠
摘要
通过电化学还原Ag/Cu(OH)2构筑得到了富含缺陷位点的Ag/Cu-OH催化剂,与Ag/CuO前驱体电化学还原获得的Ag/Cu-O相比,其表现出更好的电催化二氧化碳还原反应(CO2RR)制备C2+产物的选择性.在H型电解槽(H-cell)中评估了催化剂的电催化性能,Ag2%/Cu-OH表现出比Ag2%/Cu-O高1.5倍的乙烯(C2H4)法拉第效率(FE)和高1.3倍的C2+法拉第效率.在接近实际应用的膜电极组件(MEA)中,Ag2%/Cu-OH在高达375 mA/cm2的电流密度下,表现出高达56.2%的C2H4法拉第效率.Ag2%/Cu-OH性能的提高不仅归因于Cu和Ag之间的协同作用,还归因于具有更多的低配位Cu缺陷位点,低配位Cu有利于*CO的吸附,进一步促进了*CO二聚为C2+产物.
Abstract
In this paper,defect sites rich Ag/Cu-OH was obtained by electrochemical reduction of Ag/Cu(OH)2 for efficient carbon dioxide reduction reaction(CO2RR)to C2+products.The defect sites rich Ag/Cu-OH gives a superior activity than Ag/Cu-O obtained from the reduction of Ag/CuO precursor.The electrocatalytic performance of the catalyst was evaluated in the H-cell,and Ag2%/Cu-OH showed 1.5 times higher ethylene(C2H4)Faradaic efficiency(FE)and 1.3 times higher C2+Faraday efficiency than Ag2%/Cu-O.We obtained a high C2H4 FE of 56.2%on Ag2%/Cu-OH in the membrane electrode assembly(MEA)electrolyze at the high current density of 375 mA/cm2.The improved performance of Ag2%/Cu-OH can be attributed not only to the synergistic effect between Cu and Ag,but also to the presence of more low coordination Cu defect sites,which facilitate the adsorption of CO and further promote the dimerization of *CO to C2+products.
关键词
二氧化碳还原反应/电催化/缺陷位点/乙烯产物/C2+产物Key words
Carbon dioxide reduction reaction(CO2RR)/Electrocatalysis/Defect site/C2H4 product/C2+product引用本文复制引用
基金项目
国家自然科学基金(22308246)
国家自然科学基金(21975175)
国家自然科学基金(21878202)
中央引导地方科技发展资金项目(YDZISX20231A015)
山西省基础研究计划项目(202203021212266)
出版年
2024
国家科技期刊平台
NSTL
万方数据