CuSn合金复合纳米颗粒促进电化学CO_(2)还原  

CuSn alloy composite nanoparticles for electrochemical CO_(2)reduction

作　　者：姜云昊 赵元萌 单长胜 JIANG Yunhao;ZHAO Yuanmeng;SHAN Changsheng(Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry,Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules,College of Chemistry and Chemical Engineering,Hubei University,Wuhan 430062,China)

机构地区：[1]有机化工新材料省部共建教育部协同创新中心,有机功能化分子合成与应用教育部重点实验室,湖北大学化学化工学院,湖北武汉430062

出　　处：《湖北大学学报（自然科学版）》2024年第5期629-634,共6页Journal of Hubei University：Natural Science

基　　金：国家自然科学基金(22274036,21874031);湖北省楚天学者人才计划(020-090610)资助。

摘　　要：开发高活性、高选择性的电化学CO_(2)还原(CO_(2)RR)催化剂是二氧化碳转化应用中一个关键问题。通过逐步还原法合成了CuSn合金纳米颗粒(CuSn NPs)。透射电子显微镜(TEM)表明CuSn NPs的分散是均匀的;X射线衍射(XRD)图谱证明了Cu与Sn形成了合金结构;X射线光电子能谱(XPS)表明CuSn NPs-7.42%(wt)中Cu与Sn主要以氧化态形式存在。电化学CO_(2)还原测试结果表明Sn含量为7.42%(wt)的CuSn NPs具有最佳的CO_(2)RR催化性能,在-1.1 V vs.RHE时其对CO的法拉第效率为45.28%,是纯Cu NPs的3.5倍;同时对H2的法拉第效率仅为9.90%,约是纯Cu NPs析氢效率的1/4。这说明Sn的引入大大改善了CuSn NPs对CO_(2)RR转化为CO的法拉第效率和抑制析氢能力。CuSn NPs对CO_(2)RR选择性的提高可以归因为Sn与Cu之间的协同催化作用及强电子相互作用改善了对中间体的吸脱附能力。The development of highly active and selective electrochemical CO_(2)reduction(CO_(2)RR)catalysts is a key issue in the application of carbon dioxide conversion.CuSn alloy nanoparticles(CuSn NPs)were synthesized by stepwise reduction method.Transmission electron microscopy(TEM)show that the dispersion of CuSn NPs is uniform.The X-ray diffraction(XRD)pattern proves that Cu and Sn form an alloy structure.X-ray photoelectron spectroscopy(XPS)shows that Cu and Sn mainly exist in an oxidized state in CuSn NPs-7.42%(wt).The electrochemical CO_(2)reduction test results show that CuSn NPs with a Sn content of 7.42%(wt)exhibit the best CO_(2)RR catalytic performance,with a Faraday efficiency of 45.28%for CO at-1.1 V vs.RHE,which is 3.5 times higher than pure Cu NPs;at the same time,the Faraday efficiency of H_(2) is only 9.90%,which is about 1/4 of the hydrogen evolution efficiency of pure Cu NPs.This indicates that the introduction of Sn greatly improves the Faraday efficiency and hydrogen evolution inhibition ability of CuSn NPs in the conversion of CO_(2)RR to CO.The increase in CO_(2)RR selectivity of CuSn NPs can be attributed to the synergistic catalytic effect and strong electron interaction between Sn and Cu,which improves the adsorption/desorption energies of intermediates.

关 键 词：电催化二氧化碳还原 铜锡合金 纳米材料 一氧化碳 

分 类 号：O643.36[理学—物理化学]