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

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

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

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. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)144-153
Number of pages10
JournalNano Research
Volume7
Issue number1
DOIs
Publication statusPublished - 2014 Jan

Keywords

  • TiO
  • antimony-doped tin oxide
  • hydrogen evolution
  • photoelectrochemical
  • quantum dot

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering

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