Graphene-modified polyaniline as the catalyst material for the counter electrode of a dye-sensitized solar cell

Chen Yu Liu, Kuan Chieh Huang, Ping Hsien Chung, Chun Chieh Wang, Chia Yuan Chen, R. Vittal, Chun Guey Wu, Wen Yen Chiu, Kuo Chuan Ho

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

A nanocomposite thin film, consisting of graphene (GN) and polyaniline (PANI) (designated as GN/PANI) is coated as a catalytic layer on an FTO glass by electro-polymerization from a solution containing aniline (ANI) monomers and GNs; the thus coated electrode is used as a counter electrode (CE) for a dye-sensitized solar cell (DSSC). Modification of the surface of GNs by the ANI monomers is confirmed by thermo-gravimetric analysis (TGA). Fourier transform spectroscopy (FTIR) and UV/Vis absorption spectra are used to demonstrate the non-covalent interactions between ANI and GN in the GN/ANI particles. The effect of the refluxing process on the dispersibility of GN/ANI particles in an aqueous solution is studied. The high electro-catalytic ability of GN/PANI-CE is established through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The short-circuit current density (J SC) and power-conversion efficiency (η) of the DSSC with the GN/PANI-CE are measured to be 16.28 mA cm -2 and 7.17%, respectively, while the corresponding values are 15.01 mA cm -2 and 7.24% for a DSSC with a CE having Pt as the catalytic material (Pt-CE). The composite film of GN/PANI is thus established to be a potential catalyst for replacing the expensive, conventional Pt in a DSSC.

Original languageEnglish
Pages (from-to)152-157
Number of pages6
JournalJournal of Power Sources
Volume217
DOIs
StatePublished - 1 Nov 2012

Keywords

  • Counter electrode
  • Dye-sensitized solar cell
  • Electro-polymerization
  • Graphene
  • Polyaniline

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