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Oleic acid-assisted exfoliated few layer graphene films as counter electrode in dye-sensitized solar cell

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
545
Identifiers
DOI: 10.1016/j.jallcom.2012.08.050
Keywords
  • Graphene
  • Liquid Exfoliation
  • Oleic Acid
  • Counter Electrode
  • Dye-Sensitized Solar Cell

Abstract

Abstract We have demonstrated a facile sonication method to exfoliate graphite into few layer graphene with a high concentration of 1.3mg/mL in oleic acid (OLA). The exfoliations of natural graphite in oleylamine (OA) and trioctylphosphine (TOP) are investigated as a comparison. The few layer graphene dispersion in OLA and the graphite nanoparticles in OA are confirmed by transmission electron microscopy (TEM) observation. The exfoliated graphene dispersion in OLA (OLA-G) and graphite dispersion in OA (OA-G) are fabricated into a film on the FTO substrate by the doctor-blading method. The morphology and catalytic activity in the redox couple regeneration of all the graphite films are examined by field emission scanning electron microscopy and cyclic voltammograms. The OLA-G films on FTO glass with few layer graphene flakes shows better catalytic activity than the OA-G films. The energy conversion efficiency of the cell with the OLA-G film as counter electrode reached 3.56%, which is 70% of dye-sensitized solar cell (DSSC) with the sputtering-Pt counter electrode under the same experimental condition.

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