Jump to main content
Jump to site search

Volume 155, 2012
Previous Article Next Article

Electron transfer kinetics in water splitting dye-sensitized solar cells based on core–shell oxide electrodes

Author affiliations

Abstract

Photoelectrochemical water splitting occurs in a dye-sensitized solar cell when a [Ru(bpy)3]2+-based dye covalently links a porous TiO2 anode film to IrO2·nH2O nanoparticles. The quantum yield for oxygen evolution is low because of rapid back electron transfer between TiO2 and the oxidized dye, which occurs on a timescale of hundreds of microseconds, When iodide is added as an electron donor, the photocurrent increases, confirming that the initial charge injection efficiency is high. When the porous TiO2 film is coated with a 1–2 nm thick layer of ZrO2 or Nb2O5, both the charge injection rate and back electron transfer rate decrease. The efficiency of the cell increases and then decreases with increasing film thickness, consistent with the trends in charge injection and recombination rates. The current efficiency for oxygen evolution, measured electrochemically in a generator-collector geometry, is close to 100%. The factors that lead to polarization of the photoanode and possible ways to re-design the system for higher efficiency are discussed.

Back to tab navigation

Supplementary files

Article information


Submitted
26 Apr 2011
Accepted
10 Jun 2011
First published
06 Jul 2011

Faraday Discuss., 2012,155, 165-176
Article type
Paper

Electron transfer kinetics in water splitting dye-sensitized solar cells based on core–shell oxide electrodes

S. A. Lee, Y. Zhao, E. A. Hernandez-Pagan, L. Blasdel, W. J. Youngblood and T. E. Mallouk, Faraday Discuss., 2012, 155, 165
DOI: 10.1039/C1FD00083G

Social activity

Search articles by author

Spotlight

Advertisements