A template-free synthesis of the hierarchical hydroxymethyl PEDOT tube-coral array and its application in dye-sensitized solar cells

Yi Feng Lin, Chun Ting Li, Kuo Chuan Ho*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

A film of the hierarchical poly(hydroxymethyl 3,4-ethylenedioxythiophene) tube-coral array (PEDOT-MeOH TCA) was successfully synthesized via a template-free electro-polymerization technique. Via a four-stage growth mechanism, the PEDOT-MeOH TCA was designed to simultaneously possess (1) enhanced conjugation on the PEDOT main chain due to the electron-donating MeOH group, (2) a decreased energy band gap due to the elevated highest occupied molecular orbital level contributed by the electron-donating MeOH group, (3) tube-like fast one-dimensional (1D) charge transfer pathways, and (4) coral-like extended electro-active sites. For the application in dye-sensitized solar cells (DSSCs), the PEDOT-MeOH TCA worked as an outstanding electro-catalytic counter electrode (CE) for iodine/triiodine (I-/I3-) reduction. Thus, the DSSCs with the hierarchical PEDOT-MeOH TCA as the CE reached the highest solar-to-electricity conversion efficiency (η) of 9.13 ± 0.06%, which was even higher than that of the DSSC with a standard Pt CE (8.94 ± 0.07%). Via various electro-chemical analyses (including cyclic voltammetry (CV), rotating disk electrode (RDE), four-point probe, Tafel polarization plot, and electrochemical impedance spectroscopy (EIS) techniques), the newly synthesized PEDOT-MeOH TCA film was found to have a lower intrinsic heterogeneous charge-transfer rate constant (k0), extremely larger effective electro-catalytic surface area (Ae), and comparable sheet resistance (Rsh) to those of the standard Pt film. The PEDOT-MeOH TCA can be considered as a convincing replacement of the expensive Pt due to its high electro-catalytic ability, low cost, and simple fabrication process.

Original languageEnglish
Pages (from-to)384-394
Number of pages11
JournalJournal of Materials Chemistry A
Volume4
Issue number2
DOIs
Publication statusPublished - 2015
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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