Publication date: 17th February 2025
When assembling a DSSC, two different electrolytes were applied and evaluated: Iodolyte AN50 (Solaronix, 50 mM 1,2-dimethyl-3-propylimidazolium iodide in acetonitrile) and one named "ACVAL" (LiI 0.8 M + I2 0.05 M in a mixture 85/15 acetonitrile/ valeronitrile).
We tested both electrolytes in DSSC containing anthocyanins (cyanidin 3-O-glucoside and delphinidin-3-glucoside) or carotenoids (myxo xanthophyll-like derivates, aphanizophyll and zeaxanthin).
The DSSC's efficiencies increased when using ACVAL, particularly for those cells sensitized with anthocyanins, but not consistently when using carotenoids. Other parameters of the DSSC, particularly the FF and reproducibility, were also highly affected when using this electrolyte.
Is the iodide concentration the cause of this different behavior? Is the solvent?
Different experimental routines were applied to answer these questions. In addition to the current density vs. potential profiles, electrochemical impedance spectroscopy measurements, spectroscopic techniques, and thermodynamic considerations arising from analyzing the involved redox couples were considered.
The iodide concentration and adsorption to the semiconductor used in the DSSC photoanode could affect the visible spectra of the pigments. Therefore, the overall efficiency of the assembled cell could also be affected. As assessed by EIS measurements, the balance between the recombination and the electron transport through the semiconductor changed when using ACVAL or Iodolyte AN50.
Thermodynamic calculations, considering the redox-measured potential for the iodine-based couples and the dyes, were also helpful in understanding the observed differences.
M.F.C. is a SNI-ANII (Sistema Nacional de Investigadores, Agencia Nacional de Investigación e Innovación) and
PEDECIBA (Programa de Desarrollo de las Ciencias Básicas) researcher.
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