Functionalized graphene as a catalytic counter electrode in dye-sensitized solar cells

Joseph D. Roy-Mayhew, David J. Bozym, Christian Punckt, Ilhan A. Aksay

Research output: Contribution to journalArticlepeer-review

904 Scopus citations

Abstract

When applied on the counter electrode of a dye-sensitized solar cell, functionalized graphene sheets with oxygen-containing sites perform comparably to platinum (conversion efficiencies of 5.0 and 5.5%, respectively, at 100 mW cm-2 AM1.5G simulated light). To interpret the catalytic activity of functionalized graphene sheets toward the reduction of triiodide, we propose a new electrochemical impedance spectroscopy equivalent circuit that matches the observed spectra features to the appropriate phenomena. Using cyclic voltammetry, we also show that tuning our material by increasing the amount of oxygen-containing functional groups can improve its apparent catalytic activity. Furthermore, we demonstrate that a functionalized graphene sheet based ink can serve as a catalytic, flexible, electrically conductive counter electrode material.

Original languageEnglish (US)
Pages (from-to)6203-6211
Number of pages9
JournalACS Nano
Volume4
Issue number10
DOIs
StatePublished - Oct 26 2010

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Keywords

  • charge-transfer resistance
  • counter electrode
  • dye-sensitized solar cell
  • flexible
  • graphene
  • iodide/triiodide catalyst

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