Unveiling the role of tetragonal BiVO as a mediator for dual phase BiVO/g-CN composite photocatalysts enabling highly efficient water oxidation -scheme charge transfer

Monoclinic scheelite BiVO 4 (BVO-M) based materials are of great interest as photocatalysts for water oxidation essential to produce value-added chemical fuels, but their slow charge transfer and low activity are yet to be resolved. As a solution to overcome this challenge, we report Z -scheme photocatalyst fabricated by integrating the dual phase structure of monoclinic scheelite and tetragonal zircon-type BiVO 4 (BVO-T) moieties with graphitic carbon nitride (g-C 3 N 4 ) having π-conjugated two dimensional layers suited to visible light-induced charge transfer. Moreover, V K-edge and Bi L3-edge X-ray absorption near-edge structure (XANES) and Fourier transformed extended X-ray absorption fine structure (EXAFS) spectra demonstrate that the tetragonal zircon-type BiVO 4 structures in a Z -scheme catalyst form a bridge between BVO-M and g-C 3 N 4 structures so that it acts as an electron mediator to accelerate charge transfer, in agreement with the zeta-potential analysis and the band structure revealed by UV-vis spectroscopy and ultraviolet photoelectron spectroscopy analyses. Furthermore, a Z -scheme photocatalyst is exhibited to show a 3-fold longer charge carrier lifetime than BVO-M, thereby enabling the greater than three-fold enhancement in photocatalytic water oxidation activity. Additionally, isotope 18 O-labelling experiments reveal that evolved oxygen molecules result from water through photocatalytic water oxidation. We present the dual phase photocatalysts enabling 3-fold longer charge carrier lifetime and 3-fold enhanced photocatalytic water oxidation by integrating a tetragonal zircon-type BiVO 4 as an electron mediator for Z -scheme charge transfer.