纳米铜/多孔碳电极界面效应诱导CO_(2)电化学还原为乙醇  

Electrochemical Carbon Dioxide Reduction to Ethanol Induced by Interface Effect of Nano-Copper/Porous Carbon Electrode

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作  者:王哲[1] 严晨欢 曲艺鸿 王连卫[1] 熊大元[1] 徐少辉[1] Wang Zhe;Yan Chenhuan;Qu Yihong;Wang Lianwei;Xiong Dayuan;Xu Shaohui(School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China)

机构地区:[1]华东师范大学物理与电子科学学院,上海200241

出  处:《微纳电子技术》2021年第6期522-530,共9页Micronanoelectronic Technology

基  金:国家自然科学基金资助项目(61774060);上海市科学技术委员会资助项目(14DZ2260800)。

摘  要:为了高效、稳定地电化学还原二氧化碳(CO_(2))为多碳产物,制备了由纳米铜(Cu)原子包覆多孔石墨纤维组成的亚单层Cu金属催化剂。催化结果表明,亚单层Cu原子修饰的多孔石墨纤维在-0.8 V的小过电位下,表现出良好的电极稳定性及多碳还原效果,相对于厚层Cu电极提高了乙醇的转化效率,且在0.36~5 h间催化电流保持率稳定在95%以上。表面分析测试结果显示-0.8 V小过电位下沉积制备的亚单层Cu原子诱导C/Cu原子界面发生电荷转移,Raman散射显示催化电极的缺陷带(D带)相对于未处理石墨毡的D带出现18 cm^(-1)的负移,C/Cu界面的改善提高了Cu催化中心的活性。To reduce carbon dioxide(CO2)to a multi-carbon product efficiently and stably,a sub-monolayer copper(Cu)metal catalyst composed of nano Cu atoms coated porous graphite fibers was prepared.The catalytic results indicate that the sub-monolayer Cu atoms modified porous graphite fibers show good electrode stability and multi-carbon reduction effect at a small overpotential of-0.8 V.Comparing with thick Cu electrode,the conversion efficiency of ethanol is improved,and the catalytic current retention rate is stable above 95%during 0.36-5 h.The surface analysis test results show that the sub-monolayer Cu atoms prepared by deposition at a small overpotential of-0.8 V induces the charge transfer at the C/Cu atomic interface.The result of Raman scattering shows that the defect band(D band)of the catalytic electrode has a negative shift of 18 cm^(-1) relative to that of the untreated graphite felt,and the improvement of the C/Cu interface increases the activity of the Cu catalytic center.

关 键 词:多孔石墨纤维 石墨毡 纳米铜 界面效应 乙醇 

分 类 号:TB383[一般工业技术—材料科学与工程]

 

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