Dioxygen evolution induced by visible light at layered sensitizer/water oxidation catalyst
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Masayuki Yagi, Yoshihiro Takahashi, Isamu Ogino and Masao Kaneko
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) ([(NH3)5Ru(µ-O)Ru (NH3)4(µ-O)Ru(NH3 )5]6+) as a water oxidation catalyst. In this multilayered indium tin oxide (ITO)/Nf [Ru(bpy)32+]/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.