Surface-area-tuned, quantum-dot-sensitized heterostructured nanoarchitectures for highly efficient photoelectrodes  

作　　者：Sangbaek Park Donghoe Kim Chan Woo Lee Seong-Deok Seo Hae Jin Kim Hyun Soo Han Kug Sun Hong Dong-Wan Kim 

机构地区：[1]Department of Materials Science and Engineering, Seoul National University, Seou1151-744, Republic of Korea [2]Department of Energy Systems Research and Department of Materials Science and Engineering, Ajou University, Suwon 443-749, Republic of Korea

出　　处：《Nano Research》2014年第1期144-153,共10页纳米研究（英文版）

摘　　要：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.

关 键 词：PHOTOELECTROCHEMICAL hydrogen evolution antimony-doped tinoxide TiO2 quantum dot 

分 类 号：TN304.21[电子电信—物理电子学] TQ424.1[化学工程]