Nanotech 2010

Synthesis of Ni, Zn, Sn - Doped Ferrite Materials for H2 Generation from Water-Splitting Reaction

R. Bhosale, R. Khadka, R. Shende, J. Puszynski
South Dakota School of Mines and Technology, US

Keywords: sol-gel synthesis, doped ferrites, thermochemical water-splitting, H2 generation


Ni, Zn and Sn doped ferrites were synthesized using sol-gel synthesis and attrition milling methods. In the case of sol-gel synthesis, surfactant such as brij-76 or polymer microspheres containing hydrocarbon gases were added to the sol prior gelation. As-synthesized gel was fired rapidly in air/N2 environment using tubular furnace or industrial scale microwave furnace at 900 – 1200oC and quenched. The calcined powder was characterized using powder X-ray diffraction, BET surface area analyzer and scanning electron microscopy (SEM). The SEM analysis indicated foam like morphology and further analysis revealed nanosize tubular structure, which was consistent throughout the sample matrix. The BET surface area of this foam like material was greater than 100 m2/g. The materials prepared with attrition milling method provided a mixture of spinel and wustite. The calcined ferrite material was placed in a packed bed reactor and water-splitting reaction and regeneration of the reacted material was carried out at various temperatures. The transient hydrogen profiles obtained at various experimental conditions will be presented in detail.
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