期刊
JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY
卷 3, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3637367
关键词
hydrogen production; localised states; photoconductivity; photoelectrochemistry
资金
- NREL [XEJ-9-99042-01]
- Office of Science of the U.S. Department of Energy [DE-AC36-08GO28308]
For the last four decades, materials based on oxides have been the primary focus for studies of photo-catalysts for hydrogen production. So far, under visible-light illumination, this approach has not been much successful; only under ultraviolet radiation have oxides shown some limited success. Therefore, it is important to understand the fundamental problem of the photo-conduction properties in oxides at an electronic level. It can be shown that due to their highly localized electronic features, oxides that are Mott insulators are not suitable for photoelectrochemical (PEC) hydrogen production. Even with considerable doping/alloying, improving photo-current in these materials is unlikely. This represents a criterion by which future metal oxide candidates should be screened. Among metal oxides, the 3d elements have greater abundance and are receiving increased attention for application of solar conversion (photovoltaic and PEC), however the issues discussed here would appear to limit their usefulness for this purpose. (C) 2011 American Institute of Physics. [doi:10.1063/1.3637367]
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