Iodide-free ionic liquid with dual redox couples for dye-sensitized solar cells with high open-circuit voltage

ChemSusChem
Chun-Ting LiKuo-Chuan Ho

Abstract

A novel ionic-liquid mediator, 1-butyl-3-{2-oxo-2-[(2,2,6,6-tetramethylpiperidin-4-yl)amino]ethyl}-1H-imidazol-3-ium selenocyanate (ITSeCN), has been successfully synthesized for dye-sensitized solar cells (DSSCs). ITSeCN possesses dual redox channels, imidazolium-functionalized 2,2,6,6-tetramethylpiperidine N-oxyl (TEMPO) and selenocyanate, which can serve as the cationic redox mediator and the anionic redox mediator, respectively. Therefore, ITSeCN has a favorable redox nature, which results in a more positive standard potential, larger diffusivity, and better kinetic heterogeneous rate constant than those of iodide. The DSSC with the ITSeCN electrolyte shows an efficiency of 8.38 % with a high open-current voltage (VOC ) of 854.3 mV, and this VOC value is about 150 mV higher than that for the iodide-based DSSC. Moreover, different electrocatalytic materials were employed to trigger the redox reaction of ITSeCN. The ITSeCN-based DSSC with the CoSe counter electrode achieved the best performance of 9.01 %, which suggested that transition-metal compound-type materials would be suitable for our newly synthesized ITSeCN mediator.

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Citations

May 29, 2015·ACS Applied Materials & Interfaces·Jijeesh R NairClaudio Gerbaldi
Mar 27, 2018·Annual Review of Chemical and Biomolecular Engineering·Daniel A WilcoxBryan W Boudouris
Mar 11, 2017·Accounts of Chemical Research·Zhitong JinZhong-Sheng Wang

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