Doping strategy to promote the charge separation in BiVO4 photoanodes

Co2+ substituted for Bi3+ in BiVO4 and its enhanced photocatalytic activity under visible LED light irradiation

“…Specically, Regmi and co-workers found that Co substituted for V in the crystal lattice, indicated by the shi in the symmetric V-O stretching mode to lower wavenumber, was conrmed by the Raman result. 32 To the contrary, another study showed that Co 2+ substituted for Bi 3+ in BiVO 4 , which was conrmed by Bo Zhang et al 33 On the other hand, it was suggested by Zhou et al that the incorporation of cobalt as an oxide on the surface of larger BiVO catalysts caused no change in the crystal structure of the composites. 34 Co-doped BiVO was also investigated by Geng et al, 35 but they did not identify the substitution of Co ions for Bi 3+ or V 3+ sites in BiVO 4 .…”

Dual Modification of a BiVO4 Photoanode for Enhanced Photoelectrochemical Performance

“…To date, researchers have conducted a variety of investigations to improve the PEC performance of BiVO 4 , such as doping, morphology tuning, and surface modification; the construction of a heterojunction has been a prevalent strategy . In particular, the type II heterojunction has attracted much attention, of which the VB and conduction band (CB) of the top layer are both higher than that of the bottom layer, and thus, electrons can diffuse to the bottom layer and holes can diffuse to the top layer.…”

High Photocatalytic Performance of Pd/PdO‐Supported BiVO4 Nanoparticles for Rhodamine B Degradation under Visible LED Light Irradiation

“…Figure 4B−E are the high‐resolution spectra of Bi4 f, V2p, O1s, and Pd3d, respectively. In the Bi4 f XPS spectrum (Figure 4B), splitting peaks centered at 159.04 and 163.29 eV, corresponding to the characteristic spin‐orbit split of Bi4f 5/2 and Bi 4f 7/2 signals . In Figure 4 C, the V2p orbital exhibited splitting peaks at 516.80 and 522.65 eV, corresponding to the characteristic spin‐orbit split of V2p 1/2 and V2p 3/2 signals .…”

“…These outcomes indicated that chemical states of Bi and V were 3+ and 5+, respectively . The O 1s spectra (Figure 4 C) of 0.5%‐Pd‐BVO samples at a binding energy (BE) of 529.7 eV could be deconvoluted into three pairs of individual components referring to the surface lattice oxygen (529.69 eV), the surface adsorbed oxygen species (530.62 eV), and water (531.96 eV) . The surface lattice oxygen was indexed to the O–Bi and V–O bonds in BiVO 4 crystal lattice or Pd–O in PdO crystal lattice.…”