291986 Thermochemical Hydrogen Production From Water-Splitting Process Using Core-Shell Ferrite Nanoparticles
Thermochemical Hydrogen Production from Water-Splitting Process Using Core-Shell Ferrite Nanoparticles
S. Yelakanti, J. A. Puszynski, R. V. Shende*
South Dakota School of Mines and Technology, SD, USA
Worldwide a majority of energy demand is currently fulfilled by the use of fossil fuels. As a result, consumption of fossil fuel is increasing day by day leading to depletion of fossil fuels and greenhouse gas emission. To address these issues, hydrogen can be utilized as a partial replacement of fossil fuels. Among several existing H2 production technologies, a two-step thermochemical water-splitting process, which utilizes redox materials is considered as one of the green H2 production technologies. In this investigation, we synthesized several redox materials using sol-gel approach and utilized for H2 generation in multiple thermochemical cycles. Among different materials prepared and tested, Ni-ferrite produced highest H2 volume at water-splitting and regeneration temperatures of 700o and 1100oC, respectively. Our group has recently performed 125 thermochemical cycles using sol-gel derived ferrites and achieved higher H2 volume as compared with that reported for ceria based redox materials at 800o-1600oC. We observed that when ferrite materials undergo thermochemical cycling process, grain growth and sintering occur that decrease surface area and generate less H2. We believe that if ferrite materials are thermally stabilized, less grain growth will occur leading to higher H2 generation. In this study, thermal stabilization of ferrite materials was also investigated by performing multiple thermochemical cycles using novel core-shell Ni-ferrite/ZrO2/YSZ nanoparticles, which were synthesized using sol-gel and microemulsion routes. Using these materials grain growth mitigation as well as increase in H2 volume generation was observed. Characterization of thermally stabilized ferrites and H2 volume generated will be presented in detail.
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