Insight into the PEC and interfacial charge transfer kinetics at the Mo doped BiVO₄photoanodes

Abstract

BiVO4 is a promising photoanode material for the photoelectrochemical (PEC) oxidation of water; however, its poor charge transfer, transport, and slow surface catalytic activity limit the expected theoretical efficiency.

{040/110} Facet Isotype Heterojunctions with Monoclinic Scheelite BiVO4

“…The results were observed to follow the trend of BiVO 4 -C < BiVO 4 -H < BiVO 4 -R for each consecutive on−off cycle, suggesting an improved exciton pair separation tendency and surface charge antirecombination process over BiVO 4 -R in comparison to the other pristine materials. 51 The result is in good agreement with PL, impedance, carrier density, and transient photocurrent analysis (Figure 8a).…”

“…Moreover, the photoelectrochemical transient measurements illustrated an enhanced transient photocurrent intensity of BiVO 4 -R (Figure d). The results were observed to follow the trend of BiVO 4 -C < BiVO 4 -H < BiVO 4 -R for each consecutive on–off cycle, suggesting an improved exciton pair separation tendency and surface charge antirecombination process over BiVO 4 -R in comparison to the other pristine materials. ,, …”

“…Moreover, linear sweep voltammograms (LSV) exposing a higher photocurrent density of BiVO 4 -R (145.6 μA/cm 2 ) relative to BiVO 4 -C (75.5 μA/cm 2 ) and BiVO 4 -H (113.1 μA/cm 2 ) validates the sturdy charge carrier separation occurring over BiVO 4 -R. Nevertheless, a drastic reduction in charge carrier recombination was validated by a notable negative shift in onset potential for BiVO 4 -R (−0.33 V) in comparison to the fabricated BiVO 4 -C (−0.013 V) and BiVO 4 -H (−0.11 V) . The result is in good agreement with PL, impedance, carrier density, and transient photocurrent analysis (Figure a).…”

Effect of Mn2+ incorporation on the photoelectrochemical properties of BiVO4

“…Among widely researched topics in sustainable energy and the environment, the enhancement of the efficiency of the overall water splitting process has been vigorously pursued. [1][2][3] Research has focused on the availability of suitable semiconductors that have a low-cost, high stability, a narrow band gap, and a high quantum efficiency. 4 Monoclinic BiVO 4 has emerged as a promising photoanode material due to its non-toxicity, suitable band gap, i.e., 2.4-2.5 eV, its stability in aqueous medium, resistance to corrosion, and favorable band edge positions for water redox reactions.…”

Highly efficient hamburger-like nanostructure of a triadic Ag/Co3O4/BiVO4 photoanode for enhanced photoelectrochemical water oxidation

“…Therefore, it is important to develop an efficient and practical anode system for construction of high-performance PEC cells. [2][3][4] BiVO 4 is a highly promising photoanode, which exhibits proper band gap ($2.4 eV) for solar light absorption and favorable valence band very near the thermodynamic oxygen evolution potential. [5][6][7] However, poor charge transport, excessive electron-hole recombination, slow hole kinetics of oxygen evolution reaction and limited quantum efficiency are major challenges with the BiVO 4 photoanodes.…”