Oxygen and hydrogen productivities and repeatable reactivity of 30-mol%-Fe-, Co-, Ni-, Mn-doped CeO2−δ for thermochemical two-step water-splitting cycle

Nobuyuki Gokon, Toshinori Suda and Tatsuya Kodama

Energy, 2015, vol. 90, issue P2, 1280-1289

Abstract: The characteristics of oxygen/hydrogen productivity using 30-mol%-M (M = Fe, Co, Ni, Mn)-doped CeO2−δ (30-mol%-M-CeO2−δ) were studied for the thermochemical two-step water splitting cycle comprising TR (thermal reduction) at 1500 °C and WD (water decomposition) at 1150 °C. The reproducibility of oxygen evolution was evaluated using 30-mol%-M-CeO2−δ and the effects of different M dopants were compared in the TR temperature range of 1200–1500 °C. Two solid phases detected in the 30-mol%-M- CeO2−δ powders were involved in the redox reaction of the thermochemical two-step water splitting cycle. Among the M-CeO2−δ samples evaluated, Mn-doped CeO2−δ provided the most stable and reproducible results and the highest reactivity for oxygen evolution at all temperatures employed for the TR step of the thermochemical two-step water-splitting cycle.

Keywords: Solar heat; Energy conversion; Hydrogen production; Thermochemical water splitting; Cerium-based oxide; Redox cycle (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:90:y:2015:i:p2:p:1280-1289

DOI: 10.1016/j.energy.2015.06.085

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