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Photoelectrochemical glycerol oxidation on Mo-BiVO4 photoanodes shows high photocharging current density and enhanced H2 evolution† † Electronic supplementary information (ESI) available: Various optimization studies related to photocurrent densities and post ex situ results concerning XRD and FESEM EDX. See DOI: https://doi.org/10.1039/d2ya00077f

ABSTRACT: Mo-doped BiVO4's lower efficiency can be attributed in part to exciton recombination losses. Recombination losses during photoelectrochemical water oxidation can be eliminated by using glycerol as a hole acceptor. This results in an enhanced photocurrent density. In this research, we present the synthesis of a Mo-doped BiVO4 photoelectrode with a greater photocurrent density than a traditional pristine photoanode system. Increased photon exposure duration in the presence of glycerol leads to 8 mA cm−2 increase in photocurrent density due to the creation of a capacitance layer and a decrease in charge transfer resistance on the photoelectrode in a neutral-phosphate buffer solution thus confirming the photo charging effect. Glycerol photooxidation improves the photoelectrode's rate of hydrogen evolution. Research into the effects of electrolyte and electrode potential on photoelectrodes has revealed that when the applied potential increases, the light absorbance behaviour changes following its absorption distribution over the applied potential. Under a transmission electron microscope (TEM), a unique dynamical crystal fringe pattern is found in the nanoparticles scratched from the photoelectrode. For enhancing hydrogen evolution, solution-processed Mo-BiVO4 exhibits a distinct atomic phenomenon with a high photocharging current density.

SUBMITTER: Bora D

PROVIDER: S-EPMC9558240 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature

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