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

Seung Hyun Anna Lee, Yixin Zhao, Emil A. Hernandez-Pagan, Landy Blasdel, W. Justin Youngblood, Thomas E. Mallouk

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

Photoelectrochemical water splitting occurs in a dye-sensitized solar cell when a [Ru(bpy) 3] 2+-based dye covalently links a porous TiO 2 anode film to IrO 2·nH 2O nanoparticles. The quantum yield for oxygen evolution is low because of rapid back electron transfer between TiO 2 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 TiO 2 film is coated with a 1-2 nm thick layer of ZrO 2 or Nb 2O 5, 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.

Original languageEnglish (US)
Pages (from-to)165-176
Number of pages12
JournalFaraday Discussions
Volume155
DOIs
StatePublished - Feb 21 2012

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Electron transfer kinetics in water splitting dye-sensitized solar cells based on core-shell oxide electrodes'. Together they form a unique fingerprint.

  • Cite this

    Lee, S. H. A., Zhao, Y., Hernandez-Pagan, E. A., Blasdel, L., Youngblood, W. J., & Mallouk, T. E. (2012). Electron transfer kinetics in water splitting dye-sensitized solar cells based on core-shell oxide electrodes. Faraday Discussions, 155, 165-176. https://doi.org/10.1039/c1fd00083g