Photoelectrochemical Studies of Nanocrystalline TiO2 Film Electrodes

24Citations
Citations of this article
48Readers
Mendeley users who have this article in their library.

Abstract

Nanocrystalline semiconductor film electrodes have been prepared by sintering three different sizes of TiO2 nanoparticle sols on conducting indium-tin-oxide (ITO) glass substrate. The electrochemical and photoelectrochemical properties of the prepared electrodes were comparatively investigated. The particle sizes, surface morphologies and crystallinities of the films were studied by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. Cyclic voltammetry and capacitance measurements in the dark implies the formation of depletion layer in the semiconductor films which was usually neglected in the previous studies and shows that flat band potential (Efb) of TiO2 films depends on the size of the composing particles. The band gap excitation of the film electrodes in aqueous electrolyte solution generated the anodic photocurrents from the oxidation of water. The photocurrent quantum yield of these TiO2 films at the wavelength where all photocurrents are saturated increased as the particle size decreased. The photocapacitance measurements show that band edges of all three electrodes herein investigated were unpinned and shifted anodically under illumination. The pH dependence on band edge shift under illumination was different from that, which followed normal Helmholtz potential shift, in the dark.

Cite

CITATION STYLE

APA

Lee, M. S., Cheon, I. C., & Kim, Y. I. (2003). Photoelectrochemical Studies of Nanocrystalline TiO2 Film Electrodes. Bulletin of the Korean Chemical Society, 24(8), 1155–1162. https://doi.org/10.5012/bkcs.2003.24.8.1155

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free