Thermochemical water-splitting by a carbon-bearing Ni(II) ferrite at 300 $deg;C

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A tailor made carbon-bearing Ni(II) ferrite (CBNF) represented by Ni0.382Fe2.618O4 − δCτ was studied for two-step water-splitting at 300 °C. It was activated in Ar gas with low O2-content (< 50 ppm) to give a CBNF with a larger δ value. The activated CBNF was reacted with water to form H2 gas. The water-splitting reactivity depends on the δ and τ values, longer activation time being required for larger δ values. The rate of water splitting was dependent on the activation time and mode. Typically it was 5.4 cm3 H2 g−1 h−1 under conditions of 5 min cyclic activation mode on a CBNF with τ 0.280. This is much larger than that of a typical photochemical water-splitting, 0.016 cm3 H2 cm−3 h−1. Mossbauer spectroscopy revealed that iron rearrangement in the CBNF occurred at the first water-splitting cycle and was retained through the subsequent water-splitting cycles, and that the water-splitting occurs through the CIO layer represented by (Ni0.632+Fe2.372+O3−2)xCt.

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