Abstract
A detrimental effect of a secondary ZnO phase in Zn-modified ceria on its activity for thermochemical H2O and CO2 splitting is elucidated.
Highlights
The storage of solar energy in the form of chemical bonds in so-called solar fuels is arguably one of the most attractive approaches
To verify whether the H2 evolution with the Zn-modified ceria samples truly stabilizes after four cycles, and to gain information on the evolution of O2, the experiment was repeated for 6 H2O-splitting cycles, and the ion currents were recorded directly
Zn-modified ceria has been evaluated as a redox material for H2O splitting and CO2 splitting by solar-driven thermochemical cycles (STCs)
Summary
The storage of solar energy in the form of chemical bonds in so-called solar fuels is arguably one of the most attractive approaches. These values are generally in agreement with the results obtained in an earlier study.[36] Interestingly, while the H2O-splitting activity seems to start stabilizing in cycle #4 for both 20Zn and 10Zn, the amounts of H2 produced are consistently higher than the average value of native ceria.
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