CdS-sensitized 1-D single-crystalline anatase TiO2 nanowire arrays for photoelectrochemical hydrogen production

Dong Hoe Kim, Hyun Soo Han, In Sun Cho, Won Mo Seong, Ik Jae Park, Jong Hoon Park, Sun Shin, Gyeong Do Park, Sangbaek Park, Sangwook Lee, Kug Sun Hong

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

We report photoelectrochemical (PEC) properties of single crystalline anatase TiO2 nanowire (NW) arrays which are sensitized with CdS for visible light activity. Photocurrent varies largely with increasing the growth time (from 2 to 24 h) of the TiO2 NWs and also increasing the deposition cycles (from 7 to 13 cycles) of CdS, which are attributed to changes in morphology of the TiO2 NWs and CdS layer. TiO2 NW array grown for 3 h with 9-cycles of CdS deposition exhibits the maximum photocurrent of 3.6 mA/cm2 at 1.23 V vs. reversible hydrogen electrode (RHE) under the 1 SUN solar light. Morphological analysis combined with photoresponse analysis show that the 3 h-grown TiO2 NW array has the most suitable structure for PEC electrode because of large surface area for light absorption and chemical reaction, and that the 9-cycles deposited CdS layer provides the optimum light absorption and electron lifetime.

Original languageEnglish
Pages (from-to)863-869
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume40
Issue number1
DOIs
Publication statusPublished - 2015 Jan 5
Externally publishedYes

Keywords

  • Anatase TiO
  • CdS
  • Hydrogen production
  • Photoelectrochemical cell
  • Single crystalline anatase TiO
  • TiO nanowire

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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