Rheological and electrochemical properties of nanoclay added electrolyte for dye sensitized solar cells

Bo Ding, Youngsoo Jung, Dong Hoe Kim, Won Mo Seong, Sun Dong Kim, Sang Kuk Woo, Jung Kun Lee

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We explored quasi-solid electrolyte containing nanoclay and iodide/triiodide (I-/I3-) redox mediator in dye sensitized solar cells (DSSCs). Compared with traditional iodine based liquid electrolyte, nanoclay-based quasi-solid electrolyte provided similar conversion efficiency and carrier diffusivity. In addition, the nanoclay in the electrolyte increases thermal stability and suppresses aging behavior. The rheology measurement showed that the enhancement was attributed to the gelation of the quasi-solid electrolyte. The addition of nanoclay increased the optimum amount of iodine in the electrolyte, since a partial adsorption of iodide ions on the positive surface of the nanoclay reduces ion concentration in the electrolyte and changes the carrier transfer path. This adsorption increased in the quantity of the iodide to optimize the performance of the quasi-solid electrolyte. We have found that the charge transport in the electrolyte occurs via two parallel processes: normal physical diffusion and grotthus-type bond exchange.

Original languageEnglish
Pages (from-to)275-281
Number of pages7
JournalElectrochimica Acta
Volume144
DOIs
Publication statusPublished - 2014 Oct 20
Externally publishedYes

Keywords

  • Dye sensitized solar cells
  • Electrolyte
  • Nanoclay

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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