银修饰铜纳米阵列用于电催化还原CO_(2)

Silver-Modified Copper Nanoarrays for Electrocatalytic Reduction of CO_(2)

二氧化碳的电化学转化为气态或液体燃料具有存储可再生能源以及减少碳排放的潜力。报道了一种Ag修饰Cu纳米阵列作为二氧化碳电化学还原催化剂的简单合成方法。首先,在铜箔上通过阳极氧化生成Cu(OH)_(2)纳米阵列,然后经过原位电化学还原得到Cu纳米阵列,最后通过Cu纳米阵列和Ag+前驱体之间的电化学置换来生成Ag修饰的Cu纳米阵列。Ag修饰铜纳米阵列增强了电化学还原二氧化碳的催化性能,相较于未经修饰的铜纳米阵列,Ag修饰Cu纳米阵列电催化还原CO_(2)生成C_(2)H_(4)的法拉第效率提升了158%,同时,修饰后的电极对于C_(2+)产物的选择性提升了121%。其对CO_(2)电催化性能的提升和对氢气的抑制归因于Ag和Cu的协同催化效应。

Electrochemical conversion of carbon dioxide into gaseous or liquid fuels has the potential to store renewable energy and reduce carbon emissions.A simple synthesis method of Cu nanoarrays modified with Ag as catalyst for electrochemical reduction of carbon dioxide was reported.First,Cu(OH)_(2)nanoarrays were synthesized by anodizing on copper foil,and then by electrochemical reduction in situ.Finally,Ag-modified Cu nanoarrays were generated by Galvanic Replacement between Cu nanoarrays and Ag^(+)precursors.Compared with unmodified copper foil,the Faraday efficiency of the electrocatalytic reduction of CO_(2)to C_(2)H_(4)by Ag-modified Cu nanoarray was increased by 158%.At the same time,the selectivity of the modified electrode for C_(2+)products increased by 121%.The improvement of the electrocatalytic performance of CO_(2)and the inhibition of hydrogen were attributed to the synergistic catalytic effect of Ag and Cu.