电催化剂
析氧
纳米团簇
钴
催化作用
材料科学
氧化钴
介孔材料
氧化物
无机化学
电解质
化学工程
金属
化学
纳米技术
电化学
物理化学
电极
冶金
有机化学
工程类
作者
Mingquan Yu,Gun‐hee Moon,Rebeca G. Castillo,Serena DeBeer,Claudia Weidenthaler,Harun Tüysüz
标识
DOI:10.1002/anie.202003801
摘要
Herein, we show that the performance of mesostructured cobalt oxide electrocatalyst for oxygen evolution reaction (OER) can be significantly enhanced by coupling of silver species. Various analysis techniques including pair distribution function and Rietveld refinement, X-ray absorption spectroscopy at synchrotron as well as advanced electron microscopy revealed that silver exists as metallic Ag particles and well-dispersed Ag2 O nanoclusters within the mesostructure. The benefits of this synergy are twofold for OER: highly conductive metallic Ag improves the charge transfer ability of the electrocatalysts while ultra-small Ag2 O clusters provide the centers that can uptake Fe impurities from KOH electrolyte and boost the catalytic efficiency of Co-Ag oxides. The current density of mesostructured Co3 O4 at 1.7 VRHE is increased from 102 to 211 mA cm-2 with incorporation of silver spices. This work presents the dual role of silver moieties and demonstrates a simple method to increase the OER activity of Co3 O4 .
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