NDLI: Hydrogen Production Through Two-Step Water Splitting Using YSZ (Ni,Fe) System for Solar Hydrogen Production

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ishihara, Hideyuki Kaneko, Hiroshi Yokoyama, Tsutomu Fuse, Akinori Hasegawa, Noriko Tamaura, Yutaka
Copyright Year	2005
Abstract	The two-step water splitting with the solid solution of YSZ (Yttrium stabilized Zirconia) and Ni-ferrite (NiFe2O4) was studied for solar hydrogen production. The sample of YSZ/Ni-ferrite solid solution was prepared by calcination of the mixture of the YSZ balls and Ni-ferrite (NiFe2O4) powder. The two-step water splitting process composed of O2-releasing reaction (T = 1773K) in Ar gas flow and H2-generation reaction (T = 1473K) in Ar gas and steam flow with the YSZ/Ni-ferrite solid solution were repeated ten times, and the molar ratio of the released O2 gas and the generated H2 gas was nearly equal to 1:2 in each cycle, indicating that the two-step water splitting process proceeded stoichiometrically. The lattice constants of the YSZ/Ni-ferrite solid solution products after each step of the water splitting process were varied, therefore it was assumed that the oxidation and reduction of the iron ions proceeded in the YSZ phase. It is confirmed that the YSZ/Ni-ferrite was the solid solution and reactive ceramics of high thermal stability. The contents of iron ions determined by the atomic absorption spectroscopy indicated that the YSZ/Ni-ferrite solid solution heated at 1773K contained the only 36% of iron loaded initially. The generated O2 gas was 42% of the theoretical yield. These suggest that YSZ/Ni-ferrite solid solution is more effective reactive ceramics which has the ability to split water with concentrated solar heat than Ni-ferrite.
Sponsorship	Solar Energy Division
Starting Page	687
Ending Page	689
Page Count	3
File Format	PDF
ISBN	0791847373
DOI	10.1115/ISEC2005-76151
e-ISBN	0791837653
Volume Number	Solar Energy
Conference Proceedings	ASME 2005 International Solar Energy Conference
Language	English
Publisher Date	2005-08-06
Publisher Place	Orlando, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Solar hydrogen production Concentrated solar energy Ysz Two-step water splitting process Water Hydrogen production Solar energy
Content Type	Text
Resource Type	Article

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