Synergistic catalytic effect of a composite (CoS/PEDOT:PSS) counter electrode on triiodide reduction in dye-sensitized solar cells

P. Sudhagar, S. Nagarajan, Yong Gun Lee, Donghoon Song, Taewook Son, Woohyung Cho, Miyoung Heo, Kyoungjun Lee, Jongok Won, Yong Soo Kang

Research output: Contribution to journalArticlepeer-review

128 Scopus citations

Abstract

Inorganic/organic nanocomposite counter electrodes comprised of sheetlike CoS nanoparticles dispersed in polystyrenesulfonate-doped poly(3,4- ethylenedioxythiophene (CoS/PEDOT:PSS) offer a synergistic effect on catalytic performance toward the reduction of triiodide for dye-sensitized solar cells (DSSCs), yielding 5.4% power conversion efficiency, which is comparable to that of the conventional platinum counter electrode (6.1%). The electrochemical impedance spectroscopy (EIS) and cyclic voltammetry measurements revealed that the composite counter electrodes exhibited better catalytic activity, fostering rate of triiodide reduction, than that of pristine PEDOT: PSS electrode. The simple preparation of composite (CoS/PEDOT:PSS) electrode at low temperature with improved electrocatalytic properties are feasible to apply in flexible substrates, which is at most urgency for developing novel counter electrodes for lightweight flexible solar cells.

Original languageEnglish (US)
Pages (from-to)1838-1843
Number of pages6
JournalACS Applied Materials and Interfaces
Volume3
Issue number6
DOIs
StatePublished - Jun 22 2011

Keywords

  • CoS
  • Counter electrode
  • Dye-sensitized solar cells
  • Impedance spectroscopy
  • PEDOT:PSS

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