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Selective electrochemical CO2 reduction on Cu-Pd heterostructure
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2020-03-07 , DOI: 10.1016/j.apcatb.2020.118864
Jia-Fang Xie , Jie-Jie Chen , Yu-Xi Huang , Xing Zhang , Wei-Kang Wang , Gui-Xiang Huang , Han-Qing Yu

In this work, a novel Cu-Pd heterostructure, derived from CuCl-PdOx hexagonal microplates, was prepared to tune selective single hydrocarbon production from electrochemical CO2 reduction. The CuCl-PdOx hexagonal microplates were synthesized by a dual-potential electrodeposition technique, followed by electrochemical reduction to form Cu-Pd heterostructure. This Cu-Pd heterostructure exhibited a much higher CO2-to-CH4 selectivity (32% Faradaic efficiency, FE) compared to pure Cu or Pd. Moreover, Cu-Pd heterostructure showed excellent suppression on C2H4 generation (below 1% FE) compared to reported Cu nanostructure. The density functional theory calculations suggested that the hollow site of Pd region in the Cu-Pd heterostructure can stablize CO* intermediate and selectively lower the energy demand for CH4 formation rather than C2H4. This work provides new opportunities of designing Cu-based electrocatalysts for selective CO2 reduction to single hydrocarbon.



中文翻译:

Cu-Pd异质结构上选择性电化学还原CO 2

在这项工作中,从CuCl-PdO x六角形微孔板衍生出一种新颖的Cu-Pd异质结构,以调节从电化学CO 2还原选择性的单烃生产。通过双电位电沉积技术合成了CuCl-PdO x六角形微孔板,然后电化学还原形成Cu-Pd异质结构。与纯Cu或Pd相比,这种Cu-Pd异质结构显示出更高的CO 2 -CH 4选择性(32%法拉第效率,FE)。此外,Cu-Pd异质结构对C 2 H 4表现出优异的抑制作用相较于所报告的铜纳米结构,其生成量(低于1%FE)。密度泛函理论计算表明,Cu-Pd异质结构中Pd区域的中空位点可以稳定CO *中间产物,并选择性降低形成CH 4的能量需求,而不是C 2 H 4。这项工作为设计用于选择性地将CO 2还原为单一碳氢化合物的铜基电催化剂提供了新的机会。

更新日期:2020-03-09
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