Abstract
The catalytic aspect of a mononuclear Ru complex, [Ru(C8Otpy)(dcbpy)(OH)]− (1) (C8Otpy = 4′-octyloxy-2,2′:6′,2″-terpyridine, H2dcbpy = 4,4′-dicarboxy-2,2′-bipyridine) on a mesoporous indium tin oxide (m-ITO) electrode was investigated by multi-potential-step chronocoulo(ampero)spectrometry (MPSCC(A)S) combined with in situ O2 evolution analysis. For the repetitive MPSCC(A)S measurement between 0.2 and 1.7 V vs Ag/AgCl, 39% of 1 recovered on the first back potential-step to 0.2 V, but 1 no longer recovered after the 4th back potential-step, although the in situ measured amount of O2 increased monotonously with time. XPS and Raman spectroscopic measurements reveal that 1 on the electrode pronouncedly undergoes the oxidative transformation to form the hydrated RuO2 as the alternative catalysts under the high applied potential of 1.7 V. The RuV=O state is more active for water oxidation than the RuIV=O state but could be prone to transform to hydrated RuO2. This tells us that the low applied potential but enough for formation of the RuIV=O species is important for 1 to work stably as a molecular catalyst on the electrode.
Funder
Japan Society for the Promotion of Science
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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