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. 2020 Dec 14;59(51):23094-23099.
doi: 10.1002/anie.202010908. Epub 2020 Oct 15.

Stable Cocatalyst-Free BiVO4 Photoanodes with Passivated Surface States for Photocorrosion Inhibition

Rui-Ting Gao  1 , Lei Wang  1   2
Affiliations

Stable Cocatalyst-Free BiVO4 Photoanodes with Passivated Surface States for Photocorrosion Inhibition

Rui-Ting Gao et al. Angew Chem Int Ed Engl. .

Abstract

Improving charge transport and reducing bulk/surface recombination can increase the activity and stability of BiVO4 for water oxidation. Herein we demonstrate that the photoelectrochemical (PEC) performance of BiVO4 can be significantly improved by potentiostatic photopolarization. The resulting cocatalyst-free BiVO4 photoanode exhibited a record-high photocurrent of 4.60 mA cm-2 at 1.23 VRHE with an outstanding onset potential of 0.23 VRHE in borate buffer without a sacrificial agent under AM 1.5G illumination. The most striking characteristic was a strong "self-healing" property of the photoanode, with photostability observed over 100 h under intermittent testing. The synergistic effects of the generated oxygen vacancies and the passivated surface states at the semiconductor-electrolyte interface as a result of potentiostatic photopolarization reduced the substantial carrier recombination and enhanced the water oxidation kinetics, further inhibiting photocorrosion.

Keywords: charge transfer; heterogeneous catalysis; photoelectrochemistry; photostability; surface recombination.

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