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• W2045836481 endingPage "1191" @default.
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• W2045836481 abstract "Water-splitting potential by cation-excessive (Ni, Mn) Ferrite, Ni0.5(1+ε)Mn0.50(1+ε)Fe1.99(1+ε)O4 was evaluated using the standard Gibbs free energy change (ΔG°) for the cation-excessive ferrite formation in different O2 partial pressures. The cation-excessive degree ε ranged from 0.026 to 0.16 in pO2 values of 7.9×10−7 to 1.0×10−1. From the relation between ε value of (Ni, Mn) ferrite and oxygen partial pressure, equilibrium constant K(th) was determined. Furthermore ΔH°s for O2 releasing and water-splitting reactions with cation-excessive (Ni, Mn) ferrite were evaluated from the vant Hoff plot and compared with that for magnetite-wüstite system; where ΔH°s were assumed to be the same values for both (Ni, Mn) ferrite and magnetite–wüstite system: +300 kJ for O2 releasing and −35 ∼ −63 kJ for water-splitting. ΔG°s evaluated for water-splitting with cation-excessive (Ni, Mn) ferrite and wüstite were −38 kJ and −35 kJ, respectively, at 298K. It suggests that water splitting with cation-excessive (Ni, Mn) ferrite proceed easily compared with that with wüstite. ΔS°s for water-splitting are −0.93 kJ K−1 for the former and −0.83 kJ K−1 for the latter. H2 generation rates by reaction with H2O for (Ni, Mn) ferrite were studied at temperatures of 573 K–1073 K. It reached the maximum at 1000 K while it proceeds preferentially below 830 K from thermodynamics." @default.
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• W2045836481 date "1998-12-01" @default.
• W2045836481 modified "2023-10-16" @default.
• W2045836481 title "Thermodynamic evaluation of water splitting by a cation-excessive (Ni, Mn) ferrite" @default.
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• W2045836481 doi "https://doi.org/10.1016/s0360-3199(98)00007-x" @default.
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