Journal Article10.1021/JA00246A012
Improved charge separation and photosensitized hydrogen evolution from water with titanium dioxide particles on colloidal silica carriers
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TL;DR: In this article, the authors show that electrostatic interactions have a dramatic influence on the kinetics for charge separation and hydrogen production in aqueous systems (pH 9.8) of 20-nm diameter TiO/sub 2/modified SiO/Sub 2/ colloids in various combinations with an electron relay, a photosensitizer, and a Pt catalyst.
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Abstract: Laser flash photolysis and steady-state photolysis studies show that electrostatic interactions have a dramatic influence on the kinetics for charge separation and hydrogen production in aqueous systems (pH 9.8) of 20-nm diameter TiO/sub 2/-modified SiO/sub 2/ colloids in various combinations with an electron relay, a photosensitizer, and a Pt catalyst. Either direct excitation of the semiconductor or the photosensitizer Ru(bpy)/sub 3//sup 2 +/ (bpy = 2,2'-bipyridine), electrostatically adsorbed to the colloid, initiate electron transfer to either the zwitterionic electron relay, N,N'-bis(3-sulfonatopropyl)-4,4'-bipyridinium (PVS/sup 0/), or N,N'-bis(3-sulfonatopropyl)-2,2'-bipyridinium (DQS/sup 0/), or methyl viologen (MV/sup 2 +/). The rates and quantum yields for the formation of the radical PVS/sup -/ anion in both the TiO/sub 2/-SiO/sub 2//PVS/sup 0/ and the TiO/sub 2/-SiO/sub 2//Ru(bpy)/sub 3//sup 2 +//PVS/sup 0/ systems decline with increasing ionic strength. The rate and quantum yields for H/sub 2/ production in both the TiO/sub 2/-SiO/sub 2//DQS/sup 0//Pt and the TiO/sub 2/-SiO/sub 2//Ru(bpy)/sub 3//sup 2 +//DQS/sup 0//Pt systems also show a similar ionic strength dependence.
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