Dioxygen evolution induced by visible light at layered sensitizer/water oxidation catalyst
- 1 January 1997
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 93 (17) , 3125-3127
- https://doi.org/10.1039/a702661g
Abstract
Photoelectrocatalytic water oxidation was investigated using a multilayer-modified electrode composed of a Nafion (Nf) membrane incorporating tris(2,2′-bipyridine)ruthenium(II) ([Ru(bpy) 3 ] 2+ ) sensitizer and an electrodeposited platinum black (Pt-black) adsorbing trinuclear ruthenium complex (Ru-red) ([(NH 3 ) 5 Ru(µ-O)Ru (NH 3 ) 4 (µ-O)Ru(NH 3 ) 5 ] 6+ ) as a water oxidation catalyst. In this multilayered indium tin oxide (ITO)/Nf [Ru(bpy) 3 2+ ]/Pt-black[Ru-red] system, an anodic photocurrent was generated induced by photoexcitation of [Ru(bpy) 3 ] 2+ . This anodic photocurrent was much higher than that generated without Ru-red. Dioxygen evolution was also induced by visible light at anodic applied potentials, which was ascribed to rapid transfer of positive charge from [Ru(bpy) 3 ] 3+ to Ru-red where water oxidation takes place.Keywords
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