Abstract
Abstract Some basic problems of feasible photochemical and photoelectrochemical methods for hydrogen (and/or oxygen) production from water by solar energy utilization were briefly discussed. The subject of the discussion is focused on the hybrid, homogeneous and heterogeneous water splitting systems. Considering the present stage of knowledge, an attempt has been made to present the weak points with respect to their reaction mechanisms, instability based on side reactions, corrosion effects of solid components, etc. It is hoped that this treatment will contribute to the improvement of existing systems and also initiate the search for new ones. Though not one of the known photochemical and photoelectrochemical methods is presently applied on a large scale some, however, show promise of realization in the near future, e.g. the hybrid photothermal-electrochemical device, Yokohama Mark 6.
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