284207 Synthesis of Ferrite/ZrO2/YSZ Core-Shell Nanoparticles for H2 Generation From Thermochemical Water-Splitting Reaction

Wednesday, October 31, 2012: 9:45 AM
305 (Convention Center )
Sowmya Yelakanti and Rajesh V. Shende, Department of Chemical and Biological Engineering, South Dakota School of Mines and Technology, Rapid City, SD

H2 is a green fuel with maximum energy density as compared with the fossil fuels. Thermochemical water-splitting reaction was performed using sol-gel derived Ni-ferrite materials at water-splitting and regeneration temperatures of 700o-1100oC. After water-splitting reaction, the ferrite material was recovered and characterized using x-ray diffraction, scanning electron microscopy (SEM) and BET surface area analyzer. Although no change in phase composition was observed, a significant increase in grain size and decrease in specific surface area was noticed. When ferrite materials were subjected to thermochemical water-splitting, significant sintering and grain growth was observed that led to decrease in H2 volume generation during multiple thermochemical cycling operation. To address this issue, thermal stabilization of ferrite material was investigated by performing the synthesis of core-shell nanoparticles where sol-gel derived Ni-ferrite formed a core within ZrO2/YSZ (Yttria-stabilized Zirconia) shell. The synthesis of ferrite/ZrO2/YSZ was accomplished using micro-emulsion technique involving the use of two surfactants. In addition, Ni-ferrite/ZrO2/YSZ powdered material was also prepared using a vortex mixer. These materials were analyzed using SEM, XRD and BET surface area analyzer. The H2 generation ability of these ferrite nanomaterials was investigated by performing five consecutive thermochemical cycles in the Inconel packed-bed reactor where water-splitting and regeneration were carried out at 700-900oC and 1100oC, respectively. The use of ZrO2/YSZ as grain growth inhibitor or as a shell material in core-shell nanoparticles was affected the H2 volume generation. The results obtained on grain growth mitigation, core-shell nanostructures and H2 volume generation from thermochemical water-splitting reaction will be presented in detail.

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See more of this Session: Advances In Thermochemical Hydrogen Production
See more of this Group/Topical: 2012 International Congress on Energy (ICE)