Abstract
Ca2Fe2O5 is a p-type oxide that has not been previously investigated as a photocathode for use in a water splitting photoelectrochemical cell. In this study, Ca2Fe2O5 was synthesized as a polycrystalline electrode, and its properties relevant to photoelectrochemical hydrogen production were investigated. Ca2Fe2O5 electrodes were prepared by thermally annealing electrodeposited FeOOH films with a solution of Ca(NO3)2 drop-casted onto the electrode surface. The bandgap energy, band edge positions, flatband potential, photocurrent generation, and chemical and photoelectrochemical stabilities of Ca2Fe2O5 were examined. The results showed that Ca2Fe2O5 has an ideal bandgap and band positions that can enable the utilization of visible light for overall solar water splitting. Photocurrent–time measurements were also performed and the changes in morphology, crystallinity, and composition of the Ca2Fe2O5 electrodes before and after the photocurrent measurement were investigated. This made it possible to examine th...
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