Photoelectrochemical (PEC) water splitting is an ideal approach for converting solar energy into green hydrogen, and the controllable preparation and easy scalability of efficient photoanodes are crucial for practical application. Monoclinic phase bismuth vanadate (BiVO4) is a promising photoanode due to wide visible light utilization and good photoelectrochemical stability.
photoanode prepared by metal–organic decomposition was first unraveled to mainly result from the phase impurity caused by the relatively easy vanadium volatilization. Consequently, a BiVOcocatalyst was fabricated to exhibit a benchmark photocurrent density. Credit:Photoelectrochemical water splitting is an ideal approach for converting solar energy into green hydrogen, and the controllable preparation and easy scalability of efficient photoanodes are crucial for practical application.
Compared to popular two-step preparation methods, the one-step pyrolysis method has many advantages such as simplicity, low cost, and applicability for the fabrication of uniform large-area BiVOelectrodes by the one-step method is not satisfied. Recently, a research team led by Prof. Zhang Fuxiang from the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences has revealed key factors constraining water oxidation performance of BiVOphotoanodes prepared by one-step pyrolysis method: the loss of vanadium elements and the formation of tetragonal phase impurities.
To address this issue, they optimized the precursor consistent, and achieved the performance of 4.2 mA/cmelectrode by two-step method. Additionally, the optimized one-step pyrolysis method is available for the controlled preparation of reliable large-area BiVO
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