文章基本信息

标题：Towards Visible Light Hydrogen Generation: Quantum Dot-Sensitization via Efficient Light Harvesting of Hybrid-TiO₂
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作者：Kwanghyun Kim ; Myeong-Jong Kim ; Sun-I Kim 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2013
卷号：3
DOI：10.1038/srep03330
出版社：Springer Nature
摘要：We report pronounced enhancement of photoelectrochemical hydrogen generation of a quantum dot-sensitized hybrid-TiO₂ (QD/H-TiO₂) electrode that is composed of a mesoporous TiO₂ layer sandwiched by a double sided energy harvesting layer consisting of a surface-textured TiO₂ inverse opals layer on the bottom and a patterned mesoporous TiO₂ layer on the top. CdSe/H-TiO₂ exhibits a maximum photocurrent density of ~16.2 mA/cm², which is 35% higher than that of the optimized control sample (CdSe/P25), achieved by matching of the bandgap of quantum dot-sensitization with the wavelength where light harvesting of H-TiO₂ is observed. Furthermore, CdSe/H-TiO₂ under filtered exposure conditions recorded current density of ~14.2 mA/cm², the greatest value in the visible range. The excellent performance of the quantum dot-sensitized H-TiO₂ suggests that alteration of the photoelectrodes to suitable nanostructures with excellent light absorption may offer optimal strategies for attaining maximum efficiency in a variety of photoconversion systems.