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 Fe2O3 doped with MgO(Fe1.8Mg0.2O3)or with ZnO(Fe1.9Zn0.1O3)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 Fe2O3 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 Fe2O3/[Fe(CN)6]4-sustained cyclic systems for continuous hydrogen production.
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