Journal of the Korean Physical Society

, Volume 72, Issue 2, pp 260–269 | Cite as

Dual roles of a flouride-doped SnO2/TiO2 bilayer based on inverse opal/nanoparticle structure for water oxidation

  • Gun Yun
  • Maheswari Balamurugan
  • Kwang-Soon Ahn
  • Sang-Kwon Lee
  • Soon Hyung Kang
  • Dong-Ha Lim
Article

Abstract

Fluorine-doped tin dioxide (FTO) inverse opals (IOs) were fabricated on a template of polystyrene (PS) beads (diameter = 400 nm (±20 nm)) by using a spin-coating method. The concentration of the FTO precursor, in particular, the 1.0 M FTO concentration solution significantly influenced the morphology of the IO film. The FTO nanoparticles upon the FTO IO film were sparsely formed relative to these formed from the 0.5 M FTO solution. To compensate for the large band gap (E g = 3.8 eV) of FTO in the photoelectrochemical (PEC) reaction, we deposited a photoactive TiO2 shell on the FTO IO film by using the sol-gel method. The morphological change and the crystalline properties of the FTO IO and TiO2-coated FTO IO (hereafter referred to as FTO IO/TiO2) films, were investigated with field emission scanning electron microscopy and X-ray diffraction, respectively. The PEC behaviors of the samples were tested in a 0.1 M KOH solution under one sun illumination (100 mW/cm2 with an AM 1.5 filter). The highest PEC performance was obtained with the 1.0 M FTO IO/TiO2 film, which produced a photocurrent density (Jsc) of 3.28 mA/cm2 at 1.23 V (vs. normal hydrogen electrode (NHE), as briefly expressed to 1.23 VNHE) compared to 2.42 mA/cm2 at 1.23 VNHE with the 0.5 M FTO IO/TiO2 film. The approximately 30% enhanced performance of the 1.0 M FTO IO/TiO2 film was mainly attributed to the peculiar structure comprised of the FTO nanoparticle layer and IO films to form a bilayer structure, providing a much larger surface area, as well as complete coverage of the photoactive TiO2 nanoparticles through the FTO IO skeleton in the proper band alignment to boost the charge separation/transfer phenomenon, finally resulting in the enhanced PEC activity.

Keywords

Photoelectrochemical water splitting Fluorine-doped SnO2 Inverse opals TiO2 

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Copyright information

© The Korean Physical Society 2018

Authors and Affiliations

  • Gun Yun
    • 1
  • Maheswari Balamurugan
    • 2
  • Kwang-Soon Ahn
    • 3
  • Sang-Kwon Lee
    • 4
  • Soon Hyung Kang
    • 4
  • Dong-Ha Lim
    • 5
  1. 1.Department of Advanced Chemical Materials EngineeringChonnam National UniversityGwangjuKorea
  2. 2.Department of ChemistryChonnam National UniversityGwangjuKorea
  3. 3.School of Chemical EngineeringYeungnam UniversityGyeongsanKorea
  4. 4.Department of Chemistry Education and Optoelectronics Convergence Research CenterChonnam National UniversityGwangjuKorea
  5. 5.Korea Institute of Industrial TechnologyBusanKorea

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