Abstract
Abstract Nickel ferrite (NiFe 2 O 4 ) and pure cerium oxide (CeO 2 ) supported on monoclinic zirconia (NiFe 2 O 4 / m -ZrO 2 ) are proposed as promising redox materials for the production of hydrogen from water via a thermochemical two-step water splitting cycle. Ceramic foam devices coated with NiFe 2 O 4 / m -ZrO 2 or pure CeO 2 particles are prepared as a receiver/reactor operating a thermochemical water splitting cycle to produce hydrogen. The foam devices are examined in a directly irradiated receiver/reactor by a sun simulator on a laboratory scale. The purpose of this study is to examine the evolution of oxygen and hydrogen during the cyclization reaction different thermal-reduction (T-R) temperatures of 1450 and 1550 °C, and to compare the reproducible and stoichiometric oxygen/hydrogen production for both foam devices through a repeatable two-step reaction. In this study, a zirconia ceramic foam was used as a matrix for the reacting materials of NiFe 2 O 4 / m -ZrO 2 or CeO 2 particles. The zirconia ceramic foam has a diameter of 60 mm, a thickness of 15 mm, and a porosity of 10 cpi (cell number per linear inch). The loading amounts of reacting materials are 5 wt% for NiFe 2 O 4 / m -ZrO 2 and 40 wt% for CeO 2 particles. A concentrated Xe-beam is radiated to the foam device in a N 2 stream for the T-R step and in a N 2 /steam gas mixture for the subsequent water- decomposition (W-D) step.
Published Version
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