Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 103, Issue -, Pages 119-127Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2012.04.021
Keywords
Dye sensitized solar cells; Thermal decomposition; Electrodeposition; Pt dissolution; Degradation mechanism
Funding
- European Union
- Greek national funds through the Operational Program Regional Operational Programme of the National Strategic Reference Framework (NSRF)
- Patras University
- Greek Government
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This work investigates the stability of platinum (Pt) electrodes prepared by electrodeposition and thermal decomposition of hexachloroplatinic acid (H2PtCl6) solutions. To this aim, the electrodes were stored in an electrolyte solution (0.5 M Kl, 0.05 M I-2 in 90%/10% PC/EG) or in air, within a closed vessel, for up to 70 days. A drop of up to 40% in the current density for triiodide reduction was caused by storage in the electrolyte solution and of about 15%-20% when the electrodes were stored in air. Electrolyte storage was found to cause a 40% increase in the activation energy of both kinds of electrodes. XPS measurements have shown that the main degradation mechanism in the case of electrolyte storage is the dissolution of Pt from the substrate. Regeneration of the electrodes by heat or acid treatment was not possible. The observed electrode degradation is expected to appear in dye sensitized solar cells using this kind of counter electrodes and thus affect their long term stability. (C) 2012 Elsevier B.V. All rights reserved.
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