Photoelectrochemical studies on aqueous suspensions of some nanometal oxide/chalcogenide semiconductors for hydrogen production

Photoproduction of hydrogen was achieved by photolysis of aqueous suspensions of mixed TiO 2 /V 2 O 5 or CdS/ZnS semiconductor (SC) nanoparticle in phosphate buffers containing [Fe(CN) 6 ] 4− . Manipulations of the band structure of the SC materials took place by either combining oxides/sulphides in...

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Bibliographic Details
Published in:Bulletin of materials science 2015-04, Vol.38 (2), p.303-308
Main Authors: KASEM, KASEM K, FINLEY, AUBREY
Format: Article
Language:English
Subjects:
Binary mixtures
Cadmium sulfide
Chemistry and Materials Science
Decomposition
Electrodes
Engineering
Hydrogen
Hydrogen production
Iron cyanides
Materials Science
Metal oxides
Nanoparticles
Nanostructure
Oxidation
Oxides
Photocatalysis
Photolysis
Photoproduction
Radiation
Semiconductors
Solar energy
Titanium dioxide
Vanadium pentoxide
Vanadium pentoxide-Titanium dioxide
Zinc sulfide
Zinc sulfides
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Summary:Photoproduction of hydrogen was achieved by photolysis of aqueous suspensions of mixed TiO 2 /V 2 O 5 or CdS/ZnS semiconductor (SC) nanoparticle in phosphate buffers containing [Fe(CN) 6 ] 4− . Manipulations of the band structure of the SC materials took place by either combining oxides/sulphides in binary mixtures or by modification of the SC surface with an organic semiconductor. Studies show that the bandgap of these mixed materials varied monotonically with the percent composition of the mixture. Furthermore, results show that maximum generation of hydrated electrons by [Fe(CN) 6 ] 4− occurred at pH 6. Mixtures of CdS/ZnS showed greater photoactivity than metal oxides TiO 2 /V 2 O 5 . On the other hand, surface-modified CdS or TiO 2 gave much better photoreduction than the high percentage composite mixtures. The aqueous nanosystems used in these studies sustained their stability as indicated by the reproducibility of their photocatalytic activities.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-014-0802-y