Dynamic semiconductor-electrolyte interface for sustainable solar water splitting over 600 hours under neutral conditions

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Abstract

Photoelectrochemical (PEC) water splitting that functions in pH-neutral electrolyte attracts increasing attention to energy demand sustainability. Here, we propose a strategy to in situ form a NiB layer by tuning the composition of the neutral electrolyte with the additions of nickel and borate species, which improves the PEC performance of the BiVO4 photoanode. The NiB/BiVO4 exhibits a photocurrent density of 6.0 mA cm−2 at 1.23 VRHE with an onset potential of 0.2 VRHE under 1 sun illumination. The photoanode displays a photostability of over 600 hours in a neutral electrolyte. The additive of Ni2+ in the electrolyte, which efficiently inhibits the dissolution of NiB, can accelerate the photogenerated charge transfer and enhance the water oxidation kinetics. The borate species with BO bonds act as a promoter of catalyst activity by accelerating proton-coupled electron transfer. The synergy effect of both species suppresses the surface charge recombination and inhibits the photocorrosion of BiVO4.

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Gao, R. T., Nguyen, N. T., Nakajima, T., He, J., Liu, X., Zhang, X., … Wu, L. (2023). Dynamic semiconductor-electrolyte interface for sustainable solar water splitting over 600 hours under neutral conditions. Science Advances, 9(1). https://doi.org/10.1126/sciadv.ade4589

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