期刊
JOURNAL OF POWER SOURCES
卷 287, 期 -, 页码 87-95出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.04.038
关键词
Dye Sensitized Solar Cells (DSSCs); Resonance Raman spectroscopy; Fluorescence spectroscopy; Reverse bias; Electrolyte long-term stability
资金
- Regione Lazio Polo Solare Organico Regione Lazio
- PRIN project DSSC X (MIUR-PRIN)
- FP7-PEOPLE-ITN Destiny project [316494]
In this work we investigate electrolyte degradation mechanisms in a Dye Sensitized Solar Cell (DSSC), when stressed under forced reverse bias (RB) conditions. During the stress test, we observe a gradual and visually evident cluster shaped browning of platinised counter-electrode in contact with electrolyte solution; Raman spectroscopy confirms that the observed phenomena is due to formation of polyiodide ions and reveals an arose marked fluorescence background, stemming from new chemical species induced by RB stress test. Raman and fluorescence measurements on RB stressed model electrolyte solutions reveal that photoluminescence emission is mainly related to degradation mechanisms involving the I-/I-3(-) redox couple. In fact, due to the RB stress, the redox couple is unbalanced and the formation of various associated structures between 1-methyl-3-propyl imidazolium iodide (PMII) ions is favored. This can be detected by observing the Red Edge Effect (REE) in fluorescence emission spectra of stressed solutions. Thus, polyiodides formation in RB stressed DSSCs could be added to the several depletion channels of triiodide anions and should be taken into account in designing new stable and efficient electrolytes. (C) 2015 Elsevier B.V. All rights reserved.
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