Improved photocatalytic and photoelectrochemical performance of monoclinic bismuth vanadate by surface defect states (BiVO).

Title Improved photocatalytic and photoelectrochemical performance of monoclinic bismuth vanadate by surface defect states (BiVO).
Authors A. Tayyebi; T. Soltani; H. Hong; B.K. Lee
Journal J Colloid Interface Sci
DOI 10.1016/j.jcis.2017.12.067
Abstract

Due to visible light absorption and photochemical stability, Bismuth vanadate (BiVO), recognized to be a promising photoanodes for designing high efficiency semiconductor photoelectrochemical (PEC) devices. To improve the photocatalytic and PEC performance of BiVO, the porous monoclinic BiVOwith surface bismuth vacancy (BiVO(s-m)) was obtained after the calcination of tetrahedron bismuth vanadate (BiVO(s-t)). The photocatalytic experiments showed that despite the relatively lower adsorption capacity of BiVO(s-m) as compared with BiVO(s-t), its photocatalytic activity for the photodegradation of tetracyclines (TCs) was 15-fold greater. A four-layer thin films of BiVOwere deposited by spin coating with intermediate annealing treatment between layers and final calcination at 450?°C in air to shed light on carrier transport in BiVO(s-m). The PEC results indicated that BiVO(s-t) showed poor charge carrier mobility, while the BiVO(s-m) showed great improvement by transformation of the tetrahedron BiVO(s-t) into monoclinic phase, creation of new surface defect states and formation of a porous structure in BiVO(s-m). Furthermore, BiVO(s-m) showed enhanced and stable photocurrent density of 1.2?mA/cmat 1.0?V vs. Ag/AgCl which was achieved under visible light illumination using 0.1?M NaSOaqueous solution. The porous BiVO(s-m) showed the band gap narrowing of 0.08?eV, valence band up-shifting of 0.150?eV and 100?mV cathodic shift in onset potential relative to BiVO(s-t). This enhancement is assigned to the longer electron lifetime of BiVO(s-m), 10-fold compared to that of BiVO(s-t), resulting in a minimized electron-hole pairs recombination.

Citation A. Tayyebi; T. Soltani; H. Hong; B.K. Lee.Improved photocatalytic and photoelectrochemical performance of monoclinic bismuth vanadate by surface defect states (BiVO).. J Colloid Interface Sci. 2018;514:565575. doi:10.1016/j.jcis.2017.12.067

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