Abstract

Photocurrents, generated upon irradiation of dihexadecylphosphate (DHP) incorporated cadmium sulfide (CdS) solutions containing glucose, have been determined in a three-compartment electrochemical cell with a 3.0-mm{sup 2} platinum-disk working electrode in the absence of supporting electrolytes. Addition of methylviologen, MV{sup 2+}, as electron acceptor significantly increased the photocurrent. The onset of the photocurrent, pH{sub 0} = 10.1 {plus minus} 0.1, and the location of the quasi-Fermi level for electrons, nF{sub f}* = -0.85 V vs SCE, have been determined for DHP vesicle incorporated CdS particles containing glucose and MV{sup 2+} from pH-dependent photocurrent measurements. Substantially greater steady-state photocurrents were observed in irradiating 50-{angstrom}, instead of 100-{angstrom}, diameter DHP vesicle incorporated CdS particles. The electrochemical mechanism has been discussed in terms of (i) production of conduction-band electrons and valence-band holes, (ii) hole depletion by sacrificial electron transfer from glucose, (iii) MV{sup 2+} reduction to MV{sup {sm bullet}+} by conduction-band electrons, and (iv) reoxidation of MV{sup {sm bullet}+} at the anode.

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