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Iodide‐Free Ionic Liquid with Dual Redox Couples for Dye‐Sensitized Solar Cells with High Open‐Circuit Voltage
Author(s) -
Li ChunTing,
Lee ChuanPei,
Lee ChiTa,
Li SieRong,
Sun ShihSheng,
Ho KuoChuan
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201403204
Subject(s) - dye sensitized solar cell , redox , iodide , chemistry , ionic liquid , electrochemistry , electrolyte , inorganic chemistry , open circuit voltage , auxiliary electrode , photochemistry , electrode , catalysis , organic chemistry , physics , quantum mechanics , voltage
A novel ionic‐liquid mediator, 1‐butyl‐3‐{2‐oxo‐2‐[(2,2,6,6‐tetramethylpiperidin‐4‐yl)amino]ethyl}‐1 H ‐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 ( V OC ) of 854.3 mV, and this V OC 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.