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2-Step Thermochemical Water Splitting on a Active Material Washcoated Monolith Using a Solar Simulator as Heat Source  

Kang, Kyoung-Soo (Hydrogen Energy Research Croup, Korea Institute of Energy Research)
Kim, Chang-Hee (Hydrogen Energy Research Croup, Korea Institute of Energy Research)
Park, Chu-Sik (Hydrogen Energy Research Croup, Korea Institute of Energy Research)
Publication Information
Journal of Hydrogen and New Energy / v.18, no.2, 2007 , pp. 109-115 More about this Journal
Abstract
Solar energy conversion to hydrogen was carried out via a two-step thermochemical water splitting using metal oxide redox pair. To simulate the solar radiation, a 7 kW short arc Xe-lamp was used. Partially reduced iron oxide and cerium oxide have the water splitting ability, respectively. So, $Fe_3O_4$ supported on $CeO_2$ was selected as the active material. $Fe_3O_4/CeO_2$(20 wt/80 wt%) was prepared by impregnation method, then the active material was washcoated on the ceramic honeycomb monolith made of mullite and cordierite. Oxygen was released at the reduction step($1673{\sim}1823\;K$) and hydrogen was produced from water at lower temperature($873{\sim}1273\;K$). The result demonstrate the possibility of the 2-step thermochemical water splitting hydrogen production by the active material washcoated monolith. And hydrogen and oxygen was produced separately without any separation process in a monolith installed reactor. But the SEM and EDX analysis results revealed that the support used in this experiment is not suitable due to the thermal instability and coating material migration.
Keywords
hydrogen; thermochemical; monolith; water splitting; solar simulator;
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