Enhancing long-term photostability of BiVO4 photoanodes for solar water splitting by tuning electrolyte composition

Title
Enhancing long-term photostability of BiVO4 photoanodes for solar water splitting by tuning electrolyte composition
Authors
이동기최경신
Issue Date
2018-01
Publisher
Nature energy
Citation
VOL 3, NO 1-60
Abstract
As the performance of photoelectrodes used for solar water splitting continues to improve, enhancing the long-term stability of the photoelectrodes becomes an increasingly crucial issue. In this study, we report that tuning the composition of the electrolyte can be used as a strategy to suppress photocorrosion during solar water splitting. Anodic photocorrosion of BiVO4 photoanodes involves the loss of V5+ from the BiVO4 lattice by dissolution. We demonstrate that the use of a V5+-saturated electrolyte, which inhibits the photooxidation-coupled dissolution of BiVO4, can serve as a simple yet effective method to suppress anodic photocorrosion of BiVO4. The V5+ species in the solution can also incorporate into the FeOOH/NiOOH oxygen-evolution catalyst layer present on the BiVO4 surface during water oxidation, further enhancing water-oxidation kinetics. The effect of the V5+ species in the electrolyte on both the long-term photostability of BiVO4 and the performance of the FeOOH/NiOOH oxygen-evolution catalyst layer is systematically elucidated.
URI
http://pubs.kist.re.kr/handle/201004/72556
ISSN
2058-7546
Appears in Collections:
KIST Publication > Article
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