海参状Cu_(2)O/Cu@N-C的制备及电化学还原CO_(2)制甲酸盐  

Preparation of Sea Cucumber-like Cu_(2)O/Cu@N-C and Electrochemical reduction of CO_(2)to Produce Formate

作　　者：虎雅荣 李三秀 彭娟[1] Hu Yarong;Li Sanxiu;Peng Juan(School of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学化学化工学院,宁夏银川750021

出　　处：《宁夏大学学报（自然科学版）》2024年第4期379-388,共10页Journal of Ningxia University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(22262027)。

摘　　要：化石燃料的广泛使用导致CO_(2)排放量急剧增加,加剧了环境污染和气候变化,电化学还原CO_(2)反应制备高附加值化学品和燃料被认为是实现碳中和的一种很有前途的方法.设计和制备电化学CO_(2)还原反应(CO_(2)RR)中的高活性催化剂,对于提高目标产物的转化效率和催化剂的选择性具有重要意义.采用溶剂热法一步制备的氮掺杂、碳包裹海参状Cu_(2)O/Cu催化剂(Cu_(2)O/Cu@N-C)可将CO_(2)电化学转化为甲酸盐,并通过控制反应时间,可优化催化剂的表面形貌和电子结构.在反应时间为48 h下,制备的Cu_(2)O/Cu@N-C催化剂最有利于甲酸盐的形成,在-0.98 V(vs.RHE)时,生产甲酸盐的法拉第效率达89.26%,电流密度为12.59 mA/cm^(2).Cu_(2)O/Cu@N-C具有海参状的特殊形貌,可在反应过程中提供更多的活性位点,增强CO_(2)的吸附和活化,从而提高催化剂的选择性.The widespread use of fossil fuels has led to a sharp increase in carbon dioxide(CO_(2))emissions,resulting in serious environmental pollution and global climate problems.The electrochemical reduction of CO_(2)into high value-added chemicals and fuels can achieve genuine carbon recycling.The design and preparation of a high-activity CO_(2)RR catalyst have significant scientific and industrial value for improving the conversion efficiency and high selectivity of target products.A sea cucumber-like Cu_(2)O/Cu-supported N-C nano-catalyst(Cu_(2)O/Cu@N-C)was prepared in one step by the solvothermal method for the electrochemical conversion of CO_(2)into formate.The surface morphology and electronic structure of the Cu_(2)O/Cu@N-C catalyst can be optimized by controlling the reaction time.The Cu_(2)O/Cu@N-C catalyst synthesized at 48 hours is most favorable for formate formation.At-0.98 V(vs.RHE),the Faraday efficiency of formate can reach 89.26%,with a current density of 12.59 m A/cm^(2).Due to its special sea cucumber-like morphology,Cu_(2)O/Cu@N-C can provide more active sites during the reaction process,enhancing the adsorption and activation of CO_(2)and thus improving the catalyst's selectivity for the product.

关 键 词：电化学还原CO_(2) 纳米催化剂 形貌效应 甲酸盐 

分 类 号：TB34[一般工业技术—材料科学与工程]