Abstract
Stabilization of the light-harvesting semiconductor electrode is a key factor in the design of a photoelectrochemical (PEC) system for solar energy conversion. Approaches to circumvent the problem of PEC corrosion of these electrodes involve four major categories of materials: (a) the electrode materials themselves; (b) protective coatings; (c) catalysts; and (d) electrolytes. Wide band-gap semiconductors are candidates for electrode materials; however, their use hinges on devising effective means of sensitizing their photoresponse to wavelengths comprising the solar spectrum. These and related aspects in the design of PEC systems are reviewed in this article. Devices both of the regenerative type as well as photoelectrolysis approaches are considered.
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