Journal
ACS CATALYSIS
Volume 6, Issue 5, Pages 3017-3024Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b00455
Keywords
electrocatalysis; oxygen evolution reaction; microelectrodes; cobalt oxide; electrolysis
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Funding
- Cluster of Excellence RESOLV - Deutsche Forschungsgemeinschaft [EXC 1069]
- GDCh (Gesellschaft Deutscher Chemiker)
- Deutsche Forschungsgemeinschaft
- Cluster of Excellence Nanosystems Initiative Munich (NIM)
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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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