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제125회 대한화학회 학술발표회 및 총회 Morphology Effect of Metal Cocatalysts for Efficient Photocatalytic Hydrogen Evolution

2020년 2월 4일 16시 44분 01초
INOR.P-87 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
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Inorganic Chemistry
저자 및
Bumjin Park, Hyunjoon Song*
Department of Chemistry, Korea Advanced Institute of Science and Technology, Korea
The semiconductor-metal hybrid nanostructure is one of the ideal structures for efficient photocatalytic hydrogen evolution because photo-induced charge separation occurs at the semiconductor, and the subsequent electron transfer to metal improves the efficiency of hydrogen evolution. Although hybrid nanocatalysts have simple two components, there is sophisticated photophysical kinetics during the photocatalytic reaction. Therefore, the rational design of each component is essential to demonstrate the photocatalytic mechanism and enhances catalytic efficiency. In general, water reduction on the metal surface is a slow process compared to electron transfer, or electron-hole recombination. Therefore, the lifetime of electrons in metal domains is the key factor for increasing the efficiency of photocatalytic hydrogen evolution. In the present work, we controlled the lifetime of electrons by using defect control of the Pt tipped CdSe nanorods system and compared the photocatalytic efficiency. We synthesized three morphologies of Pt tips that are sphere, cube, and rough structures. Using transient absorption spectroscopy, we found the rough metal tips showed the longest lifetime that results in enhancement of the catalytic performance among the three samples. This work showed the correlation between the electron lifetime on the metal surface and photocatalytic efficiency and demonstrated that the rational design of metal cocatalyst can additionally improve the photocatalytic efficiency.