Optimization of a metal-organic decomposition process for high-performance photoelectrochemical oxidation of BiVO4
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변세기 KIER BiVO4 is a promising photoanode for solar-driven water splitting because of its narrow band gap and suitable band edges for oxygen evolution reaction (OER). Among various fabrication methods, a metal-organic decomposition process is commonly used to create solution processed-BiVO4 photoanode, due to its easy fabrication. However, reproducible problem has been occurred during the process, which came from unscalable deposition process of spin-coating. In this talk, we propose that the poor reproducibility is originated from an alteration of BiVO4 composition. We found that a slight change of the composition (Bi/V ratio) and solution aging effect of a vanadium precursor can impact on the material and photoelectrochemical properties of the BiVO4 photoanode. We will discuss in detail how the solution processed BiVO4 can be optimized and what important parameters should be considered for a highly efficient and reproducible BiVO4 photoanodes. |