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- Title
Effect of a Surface Area and a d-Band Oxidation State on the Activity and Stability of RuO <sub>x</sub> Electrocatalysts for Oxygen Evolution Reaction.
- Authors
Kim, Tae-Jun; Park, Shin-Ae; Chang, Seohyoung; Chun, Ho-hwan; Kim, Yong-Tae
- Abstract
It is widely recognized that RuO2 is the best electrocatalysts for oxygen evolution reaction ( OER) in water splitting in acidic media. In this study, we investigated the effect of a surface area and a d-band oxidation state on the activity and the stability of RuO x electrocatalysts for OER. We synthesized RuO x thin film on glassy carbon electrode by the radio frequency magnetic sputtering and controlled the deposition temperature to vary the surface morphology and the electronic structure. In particular, we obtained a precise d-band valence structure by using the synchrotron beam. A higher surface area and a more stable Ru4+ state were obtained at a lower deposition temperature owing to a smaller grain size and a lower oxidation state, respectively. As a result, the order of activity and stability is clearly consistent with that of surface area and stable Ru4+ state ( RuO x > RuO x 200 > RuO x 400 > RuO x 600). Hence, we suggest that the surface area and the Ru d-band oxidation state should be carefully controlled in the synthesis process in order to enhance the activity and the stability of RuO x electrocatalysts for OER.
- Subjects
SURFACE area; OXIDATION; ELECTROCATALYSIS; OXYGEN evolution reactions; SPUTTERING (Physics); ELECTRONIC structure
- Publication
Bulletin of the Korean Chemical Society, 2015, Vol 36, Issue 7, p1874
- ISSN
0253-2964
- Publication type
Article
- DOI
10.1002/bkcs.10364