Synergistic Effect of AuPd and NiOOH Cocatalysts Promoting Photoctalytic H₂O₂ Production of BiVO₄ Photocatalyst

Abstract

BiVO₄ is an ideal photocatalysts for H₂O₂ generation due to its suitable band edge. In practice, however, the photocatalytic performance of BiVO₄ is substantially low owing to the slow kinetics of 2e⁻ O₂ reduction (2e⁻ ORR) and water oxidation (WOR) processes. To solve the problems, in this work, the AuPd alloy cocatalyst and the NiOOH cocatalys were modified on the electron (010) facets and the (110) hole facet of BiVO₄ by photodeposition method. The designed AuPd/BiVO₄/NiOOH(0.5%) photocatalyst showed prominent photocatalytic H₂O₂ production activity of 289.3 µmmol·L⁻¹ with an AQE value of 0.89% at 420 nm, which was increased by 40 times compared with the BiVO₄ sample (7.1 µmmolµL⁻¹). The outstanding photocatalytic activity of the AuPd/BiVO₄/NiOOH photocatalyst can be attributed to the synergistic effect of AuPd and NiOOH cocatalysts, which promoted the kinetics of oxygen reduction and water oxidation, and concurrently facilitated the charge separation. The present strategy of dual-cocatalyst rational assembly on different facets of BiVO₄ provides an insight into explore efficient BiVO₄-based materials for H₂O₂ production.

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Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature