121st General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ELEC.P-631
Subject Dual roles of a Flouride-Doped SnO2/TiO2 Bilayered based on inverse opal/Nanoparticle structure for Water Splitting
Authors Gun Yun, Soon Hyung Kang1,*
Department of Advanced Chemicals & Engineering, Chonnam National University, Korea
1Department of Chemical Education, Chonnam National University, Korea
Abstract Fluorine-doped tin dioxide (FTO) inverse opals (IOs) were fabricated on polystyrene (PS) beads (diameter = 400 nm( 20 nm)) template by a spin-coating method. The concentration of the FTO precursor solution significantly influenced the morphology of the IOs film and, in particular, in the 1.0 M FTO solution. The FTO nanoparticles upon the FTO IO film was sparsely formed, relative to that formed from 0.5 M FTO solution. To compensate for the large band gap (Eg = 3.8 eV) of FTO in the photoelectrochemical(PEC) reaction, a photoactive TiO2 shell was deposited on the FTO IO film by the sol-gel method. The morphological change and 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 of 0.5 M FTO IO/TiO2 film. Approximately 30 % enhanced performance of 1.0 M FTO IO/TiO2 film was mainly attributed from the peculiar structure comprised of the FTO nanoparticle layer and IOs films to form the bilayer structure, providing much larger surface area as well as the complete coverage of photoactive TiO2 nanoparticles through the FTO IOs skeleton in the proper band alignment to boost the charge separation/transfer phenomenon, finally resulting in the enhanced PEC activity.
E-mail yungun7@naver.com