Increasing the surface area of electrodeposited-Pt through adding surfactant for dye-sensitized solar cell application

Yi-Hsuan Lai 1,2Chia-Yu Lin 1Chii-Wann Lin 2,3Kuo-Chuan Ho 1,4

1. Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei city 10617, Taiwan
2. Institute of Biomedical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei city 10617, Taiwan
3. Institute of Electrical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei city 10617, Taiwan
4. Institute of Polymer Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei city 10617, Taiwan

Abstract

Counter electrodes, as one of important components in dye-sensitized solar cells (DSSCs), play a role of transferring electrons arriving from external circuit back to the iodide (I-)/triiodide (I3-) redox electrolyte and to catalyze the reduction of the redox couple [1]. Although sputtered-platinum (SP-Pt) on conducting glass, such as ITO or FTO, was generally used as the counter electrode in DSSCs for I3- reduction, less attention has been paid to increase the active surface area for I3 reduction as well as the cell efficiency by controlling the morphology of Pt through adding the surfactant in the electrodeposition bath.   .          

In this study, a Pt counter electrode for ZnO-based DSSCs was prepared by electrochemical deposition of H2PtCl6 on ITO substrate in the presence of nonionic surfactant, t-octylphenoxypolyethoxyethanol (Triton® X-100). Triton® X-100 was selected to achieve an ordered structure for the electrochemically deposited Pt, which is based on the fact that a nonionic surfactant forms liquid crystalline phase that can be used as a template for the production of a well-defined mesoporous Pt [2]. Cyclic voltammetry (CV) was utilized here to compare the I/I3 redox behavior between the SP-Pt electrode and the electrodeposited-Pt (ED-Pt) electrode. Both the peak current density and the charge capacity for the ED-Pt film are larger than those of the SP-Pt film. This can be interpreted in terms of increased active surface area of this film. The ZnO-based cells fabricated with an ED-Pt counter electrode showed a higher conversion efficiency of 1.69% compared with cell fabricated with a SP-Pt (1.21%) counter electrode under the illumination of 100 mW/cm2. The enhancement was attributed to the increase in the effective surface area of Pt for I3 reduction.

References:

[1] N. Papageorgiou, W.F. Maier, M. Grätzel, J. Electrochem. Soc. 114 (1997) 876.

[2] G. S. Attard, P. N. Bartlett, N. R. B. Coleman, J. M. Elliott, J. R. Owen, J. H. Wang, Science 278 (1997) 838.

 

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Presentation: Short communication at SMCBS'2009 International Workshop, by Yi-Hsuan Lai
See On-line Journal of SMCBS'2009 International Workshop

Submitted: 2009-08-31 14:07
Revised:   2009-08-31 14:07