The photocurrent density of BiVO 4 prepared under optimized condition is over 5 mA cm −2 at 1.25 V RHE for sulfite oxidation this represents an improvement of almost 2.5 times compared to that of non-optimized BiVO 4. The decrease in particle size and increase in porosity and active facet exposure under optimized conditions are responsible for the improved photoelectrochemical performance.
Specifically, the morphology, particle size, porosity, and facet exposure of BiVO 4 are changed according to the applied potential and temperature during the electrodeposition of Bi. This affects the structure and morphology of Bi as well as the properties of the resultant BiVO 4 after the chemical reaction. The nucleation and growth kinetics of Bi dendrites are varied by changing the applied potential and temperature during electrodeposition. In this study, BiVO 4 photoanode is prepared via the chemical reaction of electrodeposited Bi metal electrode with a vanadium precursor, and the electrodeposition conditions for the Bi electrode are modified to optimize the resultant BiVO 4's photoelectrochemical performance.
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