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 1
Externally publishedYes

Fingerprint

Oxides
Semiconductor quantum dots
Heterojunctions
Hydrogen
Electrodes
Photocurrents
Fossil fuels
Solar energy
Water

Keywords

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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Materials Science(all)

Cite this

Surface-area-tuned, quantum-dot-sensitized heterostructured nanoarchitectures for highly efficient photoelectrodes. / Park, Sangbaek; Kim, Donghoe; Lee, Chan Woo; Seo, Seong Deok; Kim, Hae Jin; Han, Hyun Soo; Hong, Kug Sun; Kim, Dong-Wan.

In: Nano Research, Vol. 7, No. 1, 01.01.2014, p. 144-153.

Research output: Contribution to journalArticle

Park, Sangbaek ; Kim, Donghoe ; Lee, Chan Woo ; Seo, Seong Deok ; Kim, Hae Jin ; Han, Hyun Soo ; Hong, Kug Sun ; Kim, Dong-Wan. / Surface-area-tuned, quantum-dot-sensitized heterostructured nanoarchitectures for highly efficient photoelectrodes. In: Nano Research. 2014 ; Vol. 7, No. 1. pp. 144-153.
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