Abstract
Water splitting with H 2O/Zn/Fe 3O 4 reaction system is suggested for H 2 generation in order to utilize concentrated solar heat. This system has the possibility of generating more H 2 per 1 mol of Zn than Zn/H 2O reaction system at the same temperature, which is noted recently. When a mixture of Zn and Fe 3O 4 was heated to 873 K and steam was passed through, H 2 was obtained in 93.4% of the theoretical yield. The formation of Zn-ferrites with high content of zinc (Zn x Fe 3− x O 4; 0.2⩽ x⩽1) and ZnO was determined by XRD and Mössbauer spectroscopy. The yield of ZnO was 26–29%, which shows that the ratio of the competition-reaction (Zn/H 2O system) has less effects on the total H 2 yield. The stoichiometry and the reaction mechanism of the system are discussed upon the analyses for the solid product.
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