Hydrogen Production by Selective Photo-dissociation of Water in Aqueous Colloidal Nano-particles of Doped Iron (III) Oxides Semiconductors

Homogenous and heterogeneous production of hydrogen via photo-dissociation of water has been achieved with visible range solar radiation without any external potential at room temperature. Potassium ferrocyanide as a solvated-electron supplier and electron exchanger in basic buffers was used as a ho...

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Bibliographic Details
Published in:Journal of materials science & technology 2010-07, Vol.26 (7), p.619-624
Main Author: Kasem, Kasem K.
Format: Article
Language:English
Subjects:
Assemblies
Buffers
Colloids
Exchange
Hydrogen production
Iron
Iron and steel industry
Magnesium oxide
Media
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Oxides
Photo-dissociation
Photocatalysis
Potassium
Reduction
Reproducibility
Semiconductors
Solar radiation
Stability
Suppliers
Zinc oxide
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Summary:Homogenous and heterogeneous production of hydrogen via photo-dissociation of water has been achieved with visible range solar radiation without any external potential at room temperature. Potassium ferrocyanide as a solvated-electron supplier and electron exchanger in basic buffers was used as a homogenous media for hydrogen production. Aqueous colloidal solutions of p-type Fe 2O 3 doped with MgO (Fe 1.8Mg 0.2O 3) or with ZnO (Fe 1.9Zn 0.1O 3) suspensions in ferrocyanide solutions were used as heterogeneous media for hydrogen generation by reduction of ferricyanide. The effects of the hole-scavengers such as oxo-anions and solvated-electron- suppliers were investigated. Results showed that Fe 2O 3 doped with ZnO was more efficient than that doped with MgO. The studies also showed that the aqueous nano-systems we used retained their stability as indicated by the reproducibility of their photocatalytic activities. Solar radiated assemblies of doped Fe 2O 3/[Fe(CN) 6] − 4 sustained cyclic systems for continuous hydrogen production.
ISSN:1005-0302
1941-1162
DOI:10.1016/S1005-0302(10)60095-3