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제125회 대한화학회 학술발표회 및 총회 Improvement photo-induced electrochemical water splitting performance through heterojunction formation of WO3/BiVO4/TiO2

2020년 5월 18일 12시 34분 06초
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Environmental Energy
저자 및
Eunoak Park, Jiyoung Kim, Kiyoung Lee*
School of Nano & Materials Science and Engineering, Kyungpook National University, Korea
Photoelectrochemical (PEC) water oxidation is attracting attention as a part of sustainable eco-friendly energy. In PEC water oxidation, WO3 has been considered one of the most promising materials due to their suitable band position, relatively higher photocorrosion resistance, and low cost. WO3 provides pathway for photogenerated electrons to the current collector through the conduction band, which can greatly reduce the recombination of electron/hole pairs and thus promote H2 generation. The BiVO4 on WO3 can attract hole from WO3 which leads to enhance oxygen evolution reaction can improve. Nevertheless, BiVO4 was still challenge in a view of stability. In this reason, modification of the WO3/BiVO4 needed with blocking layer. Among several candidate, TiO2 has fundamental role in PEC performance as a passivation layer and blocks solution-mediated recombination at surface of WO3/BiVO4 core-shell heterojunction. In the present work, we show simple approach to modify WO3/BiVO4 with TiO2. As a result, the photoelectrochemical current density is 0.59 mA cm-2 at 1.23 V vs. reversible hydrogen electrode (RHE) under AM 1.5 G illumination. This result which leads 78.8µL cm-2 of H2 evolution is almost 1.5 times higher than the WO3/BiVO4 core-shell heterojunction.