Journal of Applied Electrochemistry

, Volume 44, Issue 3, pp 427–436 | Cite as

Dependence of the electrocatalytic performance of platinized counter electrodes on the redox mediator employed in dye-sensitized solar cells

  • Seon Hee SeoEmail author
  • Sung Hwan Yoon
  • Mi Hyung Kim
  • Eun Ji Jeong
  • Hyon Chol Kang
  • Seung I. Cha
  • Dong Yoon Lee
Research Article


The electrocatalytic properties of platinized counter electrodes (Pt CEs) prepared by various coating methods were investigated with respect to the redox mediator, including the widely used iodide/tri-iodide (I/I 3 ) and the more recently introduced cobalt(II/III)tris(2,2′-bipyridine) (Co(bpy) 3 2+/3+ ), for application in dye-sensitized solar cells (DSCs). The coating methods controlled Pt loading and the surface morphology of the Pt CEs. For a high-performance DSC with a fill factor >0.7, the charge-transfer resistance at the Pt CE/electrolyte interface should be <4.5 Ω cm2 for both redox mediators. The I/I 3 -mediated DSCs were insensitive to Pt loading as low as 0.001 mg cm−2, while the Co(bpy) 3 2+/3+ -mediated DSCs required relatively large Pt loadings of > 0.005 mg cm−2. Our results indicated that care should be taken in the preparation of Pt CEs with high transparency and low loading to obtain high-performance DSCs employing cobalt–ligand redox electrolyte.


Electrocatalyst Counter electrode Dye-sensitized solar cell 



This work was supported by a grant from Korea Electrotechnology Research Institute (KERI) and the “New & Renewable Energy Core Technology Program” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 2011T100100678).

Supplementary material

10800_2014_659_MOESM1_ESM.docx (1.8 mb)
Supplementary material 1 (DOCX 1827 kb)


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Seon Hee Seo
    • 1
    Email author
  • Sung Hwan Yoon
    • 1
  • Mi Hyung Kim
    • 1
  • Eun Ji Jeong
    • 1
    • 2
  • Hyon Chol Kang
    • 2
  • Seung I. Cha
    • 1
  • Dong Yoon Lee
    • 1
  1. 1.Nano Hydrid Technology Research CenterKorea Electrotechnology Research InstituteChangwonKorea
  2. 2.Department of Advanced Materials Engineering, College of EngineeringChosun UniversityGwangjuKorea

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