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Thermodynamic analysis of mixed-metal ferrites for hydrogen production by two-step water splitting

Allendorf, Mark D.; Diver, Richard B.; Miller, James E.; Siegel, Nathan P.

A thermodynamic analysis of the two-step water splitting process for the production of hydrogen is reported in this paper. Calculations simulating the preparation of ferrite samples, their thermal reduction to form a mixture of metal oxides, and subsequent reoxidation with steam to produce hydrogen were performed. Mixed-metal spinel ferrites of the general form MFe2O 4, where M = Co, Ni, or Zn, are compared with iron spinel, Fe 3O4. The results indicate that of the four ferrites examined, nickel spinel has the most favorable combination of properties for use in two-step water splitting. Copyright © 2006 by ASME.