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Journal of Materials Science

, Volume 43, Issue 9, pp 3153–3161 | Cite as

Cerium ion redox system in CeO2xFe2O3 solid solution at high temperatures (1,273–1,673 K) in the two-step water-splitting reaction for solar H2 generation

  • H. Kaneko
  • H. Ishihara
  • S. Taku
  • Y. Naganuma
  • N. Hasegawa
  • Y. TamauraEmail author
Article

Abstract

CeO2xFe2O3 (x = 0.026–0.214) solid solutions with different Ce:Fe mole ratios (Ce:Fe = 9.5:0.5–7.0:3.0) were prepared as reactive ceramics with the combustion method for solar hydrogen production. The prepared CeO2xFe2O3 solid solutions were characterized by X-ray diffractometry, ICP atomic emission spectrometry, and Mössbauer spectroscopy. Two-step water-splitting reaction with the CeO2xFe2O3 solid solution proceeded at 1,673 K for the O2-releasing reaction and at 1,273 K for the H2-generation reaction by irradiation of an infrared imaging lamp as a solar simulator. The amounts of H2 gas evolved in the H2-generation reaction with CeO2xFe2O3 solid solutions were 0.97–1.8 cm3/g, the evolved H2/O2 ratio was approximately equal to 2 of the stoichiometric value. The amounts of H2 and O2 gases were independent of the Ce:Fe mole ratio in the CeO2xFe2O3 solid solution. It was suggested that the O2-releasing and H2-generation reactions with the CeO2xFe2O3 solid solution were repeated with the reduction and oxidation of Ce4+–Ce3+ enhanced by the presence of Fe3+–Fe2+.

Keywords

CeO2 Isomer Shift Hyperfine Magnetic Field Fluorite Structure Quartz Tubular Reactor 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • H. Kaneko
    • 1
  • H. Ishihara
    • 1
  • S. Taku
    • 1
  • Y. Naganuma
    • 1
  • N. Hasegawa
    • 1
  • Y. Tamaura
    • 1
    Email author
  1. 1.Research Center for Carbon Recycling and EnergyTokyo Institute of TechnologyTokyoJapan

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