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Zinc–zinc oxide cycle
About: Zinc–zinc oxide cycle is a research topic. Over the lifetime, 167 publications have been published within this topic receiving 10505 citations.
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TL;DR: By using a solar cavity-receiver reactor, the oxygen uptake and release capacity of cerium oxide and facile catalysis at elevated temperatures to thermochemically dissociate CO2 and H2O, yielding CO andH2, respectively were combined and stable and rapid generation of fuel was demonstrated over 500 cycles.
Abstract: Because solar energy is available in large excess relative to current rates of energy consumption,
effective conversion of this renewable yet intermittent resource into a transportable and
dispatchable chemical fuel may ensure the goal of a sustainable energy future. However, low
conversion efficiencies, particularly with CO_2 reduction, as well as utilization of precious
materials have limited the practical generation of solar fuels. By using a solar cavity-receiver
reactor, we combined the oxygen uptake and release capacity of cerium oxide and facile catalysis
at elevated temperatures to thermochemically dissociate CO_2 and H_2O, yielding CO and H_2,
respectively. Stable and rapid generation of fuel was demonstrated over 500 cycles. Solar-to-fuel
efficiencies of 0.7 to 0.8% were achieved and shown to be largely limited by the system scale
and design rather than by chemistry.
1,257 citations
TL;DR: In this paper, the authors review the underlying science and describes the technological advances in the field of solar thermochemical production of hydrogen that uses concentrated solar radiation as the energy source of high-temperature process heat.
1,170 citations
TL;DR: In this article, a 2nd-law analysis performed on the closed cyclic process indicates a maximum exergy conversion efficiency of 29% (ratio of Δ G 298 K °| H 2 + 0.5 O 2 → H 2 O for the H 2 produced to the solar power input), when using a solar cavity-receiver operated at 2300 K and subjected to a solar flux concentration ratio of 5000.
669 citations
TL;DR: In this paper, a two-stage thermochemical cycle for H2 production based on CeO2/Ce2O3 oxides has been successfully demonstrated, which consists of two chemical steps: (1) reduction, 2CeO2→Ce 2O3++ 0.5O2; (2) hydrolysis, Ce2O 3+H2O→2Ce O 2+H 2
525 citations
482 citations