Surface-area-tuned, quantum-dot-sensitized heterostructured nanoarchitectures for highly efficient photoelectrodes
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- 作者：Sangbaek Park (1)
Donghoe Kim (1)
Chan Woo Lee (1)
Seong-Deok Seo (2)
Hae Jin Kim (1)
Hyun Soo Han (1)
Kug Sun Hong (1)
Dong-Wan Kim (2) - 关键词：photoelectrochemical ; hydrogen evolution ; antimony ; doped tin oxide ; TiO2 ; quantum dot
- 刊名：Nano Research
- 出版年：2014
- 出版时间：January 2014
- 年：2014
- 卷：7
- 期：1
- 页码：144-153
- 全文大小：1,396 KB
- 作者单位：Sangbaek Park (1)
Donghoe Kim (1)
Chan Woo Lee (1)
Seong-Deok Seo (2)
Hae Jin Kim (1)
Hyun Soo Han (1)
Kug Sun Hong (1)
Dong-Wan Kim (2)
1. Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, R. O. Korea
2. Department of Energy Systems Research and Department of Materials Science and Engineering, Ajou University, Suwon, 443-749, R. O. Korea - ISSN：1998-0000
文摘
Harvesting solar energy to produce clean hydrogen from photoelectrolysis of water presents a valuable opportunity to find alternatives for fossil fuels. Three-dimensional nanoarchitecturing techniques can afford enhanced photoelectrochemical properties by improving geometrical and structural effects. Here, we report quantum-dot sensitized TiO2-Sb:SnO2 heterostructures as a model electrode to enable the optimization of the structural effects through the creation of a highly conductive pathway using a transparent conducting oxide (TCO), coupled with a high surface area, by introducing branching and low interfacial resistance via an epitaxial relationship. An examination of various morphologies (dot, rod, and lamella shape) of TiO2 reveals that the rod-shaped TiO2-Sb:SnO2 is a more effective structure than the others. A photoelectrode fabricated using optimized CdS-TiO2-Sb:SnO2 produces a photocurrent density of 7.75 mA/cm2 at 0.4 V versus a reversible hydrogen electrode. These results demonstrate that constructing a branched heterostructure based on TCO can realize highperformance photoelectrochemical devices.