Manipulating the surface states of BiVO₄through electrochemical reduction for enhanced PEC water oxidation

Abstract

Bismuth vanadate (BiVO4) is a prospective candidate for photoelectrochemical (PEC) water oxidation, but its commercial application is limited due to the serious surface charge recombination. In this work, we propose...

Rational Design of CoOOH/α-Fe2O3/SnO2 for Boosted Photoelectrochemical Water Oxidation: The Roles of Underneath SnO2 and Surface CoOOH

“…0.65, 0.54, and 0.50 V vs RHE for α-Fe 2 O 3 /SnO 2 , CoOOH/α-Fe 2 O 3 , and CoOOH/α-Fe 2 O 3 /SnO 2 , respectively. This result might be attributed to the reduction of the Fermi level pinning effect caused by the reduced SS of α-Fe 2 O 3 after the decoration of SnO 2 and CoOOH . Furthermore, the N d is calculated to be 6.10 × 10 19 , 9.83 × 10 19 , 1.54 × 10 20 , and 1.92 × 10 20 cm –3 for α-Fe 2 O 3 , α-Fe 2 O 3 /SnO 2 , CoOOH/α-Fe 2 O 3 , and CoOOH/α-Fe 2 O 3 /SnO 2 , respectively, indicating that SnO 2 and CoOOH have a great synergistic effect to stimulate the charge separation of the α-Fe 2 O 3 photoanode, thus enhancing PEC water oxidation.…”

Surface States of Mo-Doped BiVO4 Nanoparticle-Based Photoanodes for Photoelectrochemical Degradation of Chloramphenicol

“…In these measurements, the photoanodes were held at 2 V Ag/AgCl under illumination for 120 s and then following CV measurements in the dark using a cathodic scan of four cycles. 33 The cathodic peaks observed during the first cycle correspond to the reduction of SS, which signifies the recombination of electrons in the conduction band with surface-trapped holes. 53 As can be seen in the typical CV results (Figure 6a−d), two reduction peaks appear at around 0.6 V Ag/AgCl (peak 1) and 1.0 V Ag/AgCl (peak 2) in the first cycle.…”

“…It is widely known that the presence of surface states (SS) at the SEI plays a significant role in the migration of charge carriers and surface catalytic reactions. , The SS behavior can shed light on the mechanism of interfacial charge transfer during the reactions, and their regulation can lead to improvements in the interfacial charge transfer efficiency of the target reaction. One approach to enhance charge separation and inhibit surface recombination is the deposition of the TiO 2 layer onto the BiVO 4 nanoparticle-based photoanode .…”

Optical and Electrical Modulation Strategies of Photoelectrodes for Photoelectrochemical Water Splitting

“…[ 167 ] Due to the atomic ratio disparity, the surface electronic state of certain materials is significantly different from the bulk, resulting in a polar surface with a surface polarization field. [ 162 ] Although the surface polarization field is limited, it remains an essential factor in carrier separation. To optimize the performance of the photoelectrodes used in solar fuel production, it is essential to design a polarized photoelectrode surface.…”