Graphite with Different Structures as Catalysts for Counter Electrodes in Dye-sensitized Solar Cells

Yu Yan Li, Chun Ting Li, Min Hsin Yeh, Kuan Chieh Huang, Ping Wei Chen, R. Vittal, Kuo Chuan Ho*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Three graphite materials with different structures, including graphite nanofiber (GNF), graphite nanosheet (GNS), and graphite nanoball (GNB), were used as the catalytic films on the counter electrodes (CEs) of dye-sensitized solar cells (DSSCs). Compared to GNF and GNS, GNB not only provides a higher degree of defects in the sp2 plane structure but also possesses aboundant hydroxyl functional groups as the electro-catalytic active sites for I3- reduction; thereby, the intrinsic heterogeneous rate constant (k0) and effective electro-catalytic surface area (Ae) of GNB-based CE are both higher than the values of GNF-based and GNS-based CEs. The GNB-based DSSC with showed the power conversion efficiency (η) of 7.88%, while those GNF-based and GNS-based DSSCs showed η's of 3.60% and 2.99%, respectively. Moreover, it is also observed that the η of the GNB-based DSSC (7.88%) is quite close to that of a Pt-based DSSC (η=8.38%); this implies that the GNB can become a potential candidate to replace the expensive Pt, owing to its low-cost.

Original languageEnglish
Pages (from-to)211-219
Number of pages9
JournalElectrochimica Acta
Volume179
DOIs
Publication statusPublished - 2015 Oct 10
Externally publishedYes

Keywords

  • Counter electrode
  • Dye-sensitized solar cell
  • Graphite
  • Rotating disk electrode

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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