淡江大學機構典藏:Item 987654321/125606
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    题名: On the Operando Structure of Ruthenium Oxides during the Oxygen Evolution Reaction in Acidic Media
    作者: Nipon Deka, Travis E. Jones, Lorenz J. Falling, Luis-Ernesto Sandoval-Diaz, Thomas Lunkenbein, Juan-Jesus Velasco-Velez, Ting-Shan Chan, Cheng-Hao Chuang, Axel Knop-Gericke, and Rik V. Mom
    关键词: Operando XAS;Ruthenium Oxide;Oxygen Evolution Reaction;Electrocatalysis;O K-Edge XAS;Ru M-Edge XAS;Ru L-Edge XAS
    日期: 2023-05-19
    上传时间: 2024-07-30 12:06:55 (UTC+8)
    出版者: American Chemical Society
    摘要: In the search for rational design strategies for oxygen evolution reaction (OER) catalysts, linking the catalyst structure to activity and stability is key. However, highly active catalysts such as IrOx and RuOx undergo structural changes under OER conditions, and hence, structure–activity–stability relationships need to take into account the operando structure of the catalyst. Under the highly anodic conditions of the oxygen evolution reaction (OER), electrocatalysts are often converted into an active form. Here, we studied this activation for amorphous and crystalline ruthenium oxide using X-ray absorption spectroscopy (XAS) and electrochemical scanning electron microscopy (EC-SEM). We tracked the evolution of surface oxygen species in ruthenium oxides while in parallel mapping the oxidation state of the Ru atoms to draw a complete picture of the oxidation events that lead to the OER active structure. Our data show that a large fraction of the OH groups in the oxide are deprotonated under OER conditions, leading to a highly oxidized active material. The oxidation is centered not only on the Ru atoms but also on the oxygen lattice. This oxygen lattice activation is particularly strong for amorphous RuOx. We propose that this property is key for the high activity and low stability observed for amorphous ruthenium oxide.
    關聯: ACS Catalysis 13(11), p.7488-7498
    DOI: 10.1021/acscatal.3c01607
    显示于类别:[物理學系暨研究所] 期刊論文

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