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Two-Step Thermochemical Cycle with Supported $NiFe_2O_4$ for Hydrogen Production  

Kim, Woo-Jin (Department of Chemical Engineering, Chungnam National Univ.)
Kang, Kyoung-Soo (Hydrogen Energy Research Group, Korea Institute of Energy Research)
Kim, Chang-Hee (Hydrogen Energy Research Group, Korea Institute of Energy Research)
Choi, Won-Chul (Hydrogen Energy Research Group, Korea Institute of Energy Research)
Kang, Yong (Department of Chemical Engineering, Chungnam National Univ.)
Park, Chu-Sik (Hydrogen Energy Research Group, Korea Institute of Energy Research)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.19, no.6, 2008 , pp. 505-513 More about this Journal
Abstract
The two-step thermochemical cycle was examined on the $CeO_2$, YSZ, and $ZrO_2$-supported $NiFe_2O_4$ to investigate the effects of support material addition. The supported $NiFe_2O_4$ was prepared by the aerial oxidation method. Thermal reduction was conducted at 1573K and 1523K while water-splitting was carried out at 1073K. Supporting $NiFe_2O_4$ on $CeO_2$, YSZ and $ZrO_2$ alleviated the high-temperature sintering of iron-oxide. As a result, the supported $NiFe_2O_4$ exhibited greater reactivity and repeatability in the water-splitting cycle as compared to the unsupported $NiFe_2O_4$. Especially, $ZrO_2$-supported $NiFe_2O_4$ showed better sintering inhibition effect than other supporting materials, but hydrogen production amount was decreased as cycle repeated. In case of $CeO_2$-supported $NiFe_2O_4$, improvement of hydrogen production was found when the thermal reduction was conducted at 1573K. It was deduced that redox reaction of $CeO_2$ activated above 1573K.
Keywords
Thermal reduction; Water-splitting; Hydorgen production; $NiFe_2O_4$; Sintering; Support material;
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Times Cited By KSCI : 2  (Citation Analysis)
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