Enhancing Electrochemical CO2 Reduction Activity via Charge Transfer and sp-Band Filling in a Au Thin Layer on Ag,ACS Applied Energy Materials

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Enhancing Electrochemical CO2 Reduction Activity via Charge Transfer and sp-Band Filling in a Au Thin Layer on Ag
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-09-22 , DOI: 10.1021/acsaem.0c01407
Wen Guo ₁ , Kyubin Shim ₂ , Sang-Mun Jung ₂ , Hye Su Kang ₂ , Yong-Tae Kim ₂

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Producing practical chemical feedstocks via electrochemical CO₂ reduction is a promising technology for carbon recycling and renewable energy storage. To improve CO₂ reduction performance, electrocatalysts with high activity and selectivity must be developed. In this study, Au layers of varying thicknesses were sputtered on polycrystalline Ag catalysts to promote the selective reduction of CO₂ to CO. The results show that a 2 nm Au layer sputtered on polycrystalline Ag exhibited a faradaic efficiency of 83.9% at −0.9 V versus the reversible hydrogen electrode with a current density of 5.93 mA cm^–2. The superior performance of the layered catalyst resulted from the facile charge transfer from Ag to Au, which enhanced the catalytic activity. Furthermore, because the increased electron population in the sp-band resulted in strong CO surface interactions, the layered catalyst exhibited enhanced selectivity for CO production. Thus, this study presents an efficient approach to develop effective layered catalysts for electrochemical CO₂ reduction.

中文翻译：

通过在Ag上的Au薄层中进行电荷转移和sp带填充增强电化学CO ₂还原活性

通过电化学还原CO ₂来生产实用的化学原料是用于碳回收和可再生能源存储的有前途的技术。为了提高CO ₂还原性能，必须开发具有高活性和选择性的电催化剂。在这项研究中，在多晶Ag催化剂上溅射了不同厚度的Au层，以促进将CO ₂选择性还原为CO。结果表明，在多晶Ag上溅射2 nm的Au层在-0.9 V时具有83.9％的法拉第效率。与电流密度为5.93 mA cm ^–2的可逆氢电极相比。层状催化剂的优异性能归因于从Ag到Au的便捷电荷转移，从而增强了催化活性。此外，由于在sp带中电子数量的增加导致强烈的CO表面相互作用，因此层状催化剂显示出更高的CO生成选择性。因此，该研究提出了开发用于电化学还原CO _2的有效层状催化剂的有效方法。

更新日期：2020-10-26

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