Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (2): 219-226.DOI: 10.1016/S1872-2067(12)60737-2

• Research papers • Previous Articles     Next Articles

Screen-printed Pt counter electrodes exhibiting high catalytic activity

Chunyu Zhaoa, Yantao Shia, Zhiyong Zhongb, Tingli Maa,b   

  1. a State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, China;
    b Yingkou Opvtech New Energy Co. Ltd., Yingkou 113003, Liaoning, China
  • Received:2013-07-05 Revised:2013-10-23 Online:2014-01-16 Published:2014-01-17
  • Contact: Yantao Shi,Tingli Ma
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51273032), the National High Technology Research and Development Program of China (2009AA03Z220), and the Fundamental Research Funds for the Central Universities (DUT12RC(3)57).

Abstract:

Counter electrodes (CEs) for dye-sensitized solar cells (DSCs) are important for collecting electrons and catalyzing the iodide/tri-iodide reaction. Pt CEs are commonly prepared by magnetron sputtering, which is expensive and requires vacuum conditions. Incorporating the low cost surfactant Span-85 improved the adhesion between the Pt particles and conductive substrate, and allowed Pt-based CEs to be screen-printed. The screen-printed CE was compared with those prepared by dip-coating and spin-coating. Photoelectric conversion efficiencies of 7.30%, 6.96% and 7.03% were achieved for DSCs containing screen-printed, dip-coated and spin-coated CEs, respectively. Optical transmittance measurements, scanning electron microscopy, and film adhesion tests results showed that the surfactant improved film adhesion and increased transmittance, and the screen-printed CEs exhibited comparable transmittance to the dip-coated CEs. Screen-printing resulted in Pt particles being more uniformly distributed on the substrate, when compared with dip-coating or spin-coating. Cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel-polarization curves showed that the catalytic activity of the screen-printed Pt-based CEs were higher than that of the other CEs. Screen-printing is suitable for realizing the low-cost large-scale production of large Pt-based CEs.

Key words: Counter electrode, Adhesion uniformity, Controllable, Dye-sensitized solar cell