Abstract
A p/n photochemical diode consisting of p-GaP and n-Fe 2O 3 has been assembled in a monolithic unit which, when exposed to visible and near uv radiation in aqueous solution, produces hydrogen in relatively low quantum yields. This unit also splits seawater using incident solar radiation. Both photoelectrode materials showed enhancements of their photo currents when catalysts (RuO 2 on n-Fe 2O 3 and Pt on p-GaP) were deposited on their surfaces. The gases generated at each electrode were mass spectrometrically confirmed as originating from the water.
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