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H2 Generation from Thermochemical Water-Splitting Reaction Using Sol-Gel Derived Un-doped and Doped Ferrite Materials

R.R. Bhosale, R.V. Shende, J.A. Puszynski
South Dakota School of MInes & Technology, US

Keywords: SOl-gel, ferrites, nanoparticles, thermochemical water-splitting, H2 generation


One of the green ways of producing H2 is by thermochemical water-splitting reaction, which utilizes mixed valence metal oxides (MO) i.e. ferrite based redox reactions for the H2 generation. In this investigation, several undoped ferrites such as Ni-, Zn-, Sn-, Mn- and Co-ferrite and doped ferrites such as Ni-Zn-, Ni-Sn-, Ni-Mn- and Ni-Co-ferrite were synthesized using sol-gel technique. As-synthesized gels were aged for 24 h and heated rapidly in a muffle furnace upto 600–1000oC and quenched in air. The calcined powders thus obtained were characterized using powder X-ray diffraction, BET surface area analyzer, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Ferrite material was placed in a packed bed reactor and multiple thermochemical cycles were performed at various processing conditions. The sol-gel synthesis method, characterization of the synthesized ferrites using several characterization techniques, the transient H2 generation profiles obtained during multiple thermochemical cycles using sol-gel derived ferrites and effects of several operating parameters such as water-splitting temperature, regeneration temperature, regeneration time and concentration of water in the feed stream on H2 yield will be presented in detail. In addition, H2 generation performance of the nanosized ferrite materials will be compared with their micron size counterparts.
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