期刊
ACS CATALYSIS
卷 6, 期 5, 页码 3017-3024出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b00455
关键词
electrocatalysis; oxygen evolution reaction; microelectrodes; cobalt oxide; electrolysis
资金
- Cluster of Excellence RESOLV - Deutsche Forschungsgemeinschaft [EXC 1069]
- GDCh (Gesellschaft Deutscher Chemiker)
- Deutsche Forschungsgemeinschaft
- Cluster of Excellence Nanosystems Initiative Munich (NIM)
Oxide materials are among the state-of-the-art heterogeneous electrocatalysts for many important large-scale industrial processes, including O-2 and Cl-2 evolution reactions. However, benchmarking their performance is challenging in many cases, especially at high current densities, which are relevant for industrial applications. Serious complications arise particularly due to (i) the formation of a nonconducting gas phase which blocks the surface during the reactions, (ii) problems in determination of the real electroactive electrode area, and (iii) the large influence of surface morphology alterations (stability issues) under reaction conditions, among others. In this work, an approach overcoming many of these challenges is presented, with a focus on electrochemically formed thin-film oxide electrocatalysts. The approach is based on benefits provided by the use of microelectrodes, and it gives comprehensive information about the surface roughness, catalyst activity, and stability. The key advantages of the proposed method are the possibility of characterization of the whole microelectrode surface by means of atomic force microscopy and an accurate assessment of the specific activity (and subsequently stability) of the catalyst, even at very high current densities. Electrochemically deposited CoOx thin films have been used in this study as model catalysts.
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