Deep Eutectic Solvent (DES) Based on Choline Chloride and Mono-, Di-, Poly-Ethylene Glycol as KI/I2 Electrolyte Solvents on DSSC Devices

https://doi.org/10.22146/ijc.82754

Adhitya Adhitya(1), Winda Rahmalia(2*), Intan Syahbanu(3), Gusrizal Gusrizal(4), Adhitiyawarman Adhitiyawarman(5)

(1) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tanjungpura University, Jl. Prof. Dr. Hadari Nawawi, Pontianak 78124, Indonesia
(2) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tanjungpura University, Jl. Prof. Dr. Hadari Nawawi, Pontianak 78124, Indonesia
(3) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tanjungpura University, Jl. Prof. Dr. Hadari Nawawi, Pontianak 78124, Indonesia
(4) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tanjungpura University, Jl. Prof. Dr. Hadari Nawawi, Pontianak 78124, Indonesia
(5) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tanjungpura University, Jl. Prof. Dr. Hadari Nawawi, Pontianak 78124, Indonesia
(*) Corresponding Author

Abstract


Deep eutectic solvent (DES) has high viscosity and electrical conductivity values, so it can be used as an electrolyte solvent in dye-sensitized solar cells (DSSCs). This research was conducted to produce DES based on choline chloride (ChCl) and ethylene glycol (EG), diethylene glycol, and polyethylene glycol-400, which were then used as KI/I2 couple redox electrolyte solvent to improve the DSSC performance. The synthesis was carried out by mixing each component in several variations of the mole fraction of ChCl (xCHCl) at 80 °C for 15 min, and then was characterized by their pH, freezing point, density, viscosity, and electrical conductivity. A mixture that meets the criteria as a eutectic solvent and has a freezing point of less than −18 °C with the highest electrical conductivity value is DES ChCl:EG with xChCl 0.3 and xChCl 0.4. Both DESs were then used as a solvent for KI/I2, combined with acetonitrile in various compositions. The electrolyte with the highest electrical conductivity value was KI/I2 dissolved in ChCl:EG with xChCl 0.3 solvent 6:4 v/v, and then employed in DSSC device. The best performance of DSSC (Isc= 0.155 mA/cm2; Voc=0.465 V; Pmax= 0.719 W; ηmax= 0.072%) was produced under a light intensity of 0.1 W/cm2.

Keywords


deep eutectic solvent; dye-sensitized solar cell; electrolyte; viscosity; electrical conductivity

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DOI: https://doi.org/10.22146/ijc.82754

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