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Issue 37, 2014
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Low viscosity highly conductive ionic liquid blends for redox active electrolytes in efficient dye-sensitized solar cells

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Abstract

Mixtures of ionic liquids were prepared and used for the development of composite redox electrolytes by blending a standard low viscosity ionic liquid solvent (EMimDCA, 1-ethyl-3-methylimidazolium dicyanamide) with various iodide-based ionic liquids based on the methylimidazolium cation (DMII, EMII, PMII, BMII and HMII). The novel electrolytes based on the [CnC1im]I–EMimDCA double salt ILs show interesting physicochemical properties including low viscosity (10–110 MPa s) and high diffusion coefficient of triiodides Image ID:c4ta02529f-t1.gif, respectively, characteristics that promise increased performance in DSC devices. Their electrochemical properties along with the conductivity were also tuned and optimized; values as high as 2–4 mS cm−1 were estimated for the conductivity. Solar cells based on these composite electrolytes attained efficiencies over 4% under 1 sun with the highest being 5.5%, attained by the EMimDCA–DMII mixture. Quite notably, these efficiencies further increased up to 6.5%, when the cells were illuminated by 0.1 sun.

Graphical abstract: Low viscosity highly conductive ionic liquid blends for redox active electrolytes in efficient dye-sensitized solar cells

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Article information


Submitted
20 May 2014
Accepted
18 Jul 2014
First published
21 Jul 2014

J. Mater. Chem. A, 2014,2, 15326-15336
Article type
Paper
Author version available

Low viscosity highly conductive ionic liquid blends for redox active electrolytes in efficient dye-sensitized solar cells

M. Bidikoudi, L. F. Zubeir and P. Falaras, J. Mater. Chem. A, 2014, 2, 15326
DOI: 10.1039/C4TA02529F

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