スプレー熱分解を用いたp 型CuBi2O4 の開発と光電気化学特性評価

DOI 機関リポジトリ 機関リポジトリ (HANDLE) オープンアクセス

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  • Photoelectrochemical properties of p-type CuBi2O4 prepared by spray pyrolysis

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Solar-to-chemical energy conversion using semiconductor-based photoelectrodes for photoelectrochemical water splitting is a promising technology contributing to an environmentally friendly society. CuBi2O4 is a p-type semiconductor material that can be used in visible-light-responsive photocathodes. The fabrication of CuBi2O4 has been examined using wet processes such as spray pyrolysis of precursor solutions containing organic solvents and organic additives. Spray pyrolysis causes problems such as CO2 emission during the decomposition of the precursor solution. In this study, we established a carbon-free method for the fabrication of CuBi2O4 using a precursor solution comprising Cu(NO3)2 and Bi(NO3)3 dissolved in a diluted nitric acid aqueous solution. The impact of surface modification with Pt cocatalyst for hydrogen evolution reaction was investigated. This study provides rational guidelines for visible-light-absorbing photoelectrodes utilizing a carbon-free preparation process.

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