Abstract
We report the effect of chemical reduction of bismuth vanadate (BiVO4) photoelectrdoe by lithium-based strongly basic solution. Lithium dissolved in ethylenediamine anhydrous rapidly reduces the bismuth vanadate films with momentary immersion in the solution. This chemical reduction could form oxygen vacancies and these defects act as shallow donors for bismuth vanadate and increase the donor densities without trapping. Electrochemical impedance measurements showed that the donor densities of bismuth vanadate films were significantly enhanced. Photoelectrochemical water splitting performance was improved as well with photocurrent increase. The enhanced photoactivities were attributed to increased donor densities of reduced bismuth vanadate, which have effects on the charge transport.
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