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Issue 5, 2014
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A one-pot route to prepare class II hybrid ionogel electrolytes

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A new system based on class II hybrid ionogels (Si-IL gels) has been developed for overcoming leaking problems associated with liquid electrolytes in dye-sensitized solar cells (DSSCs). We co-condensed a silica precursor with an alkoxysilane functionalized ionic liquid precursor, under acidic conditions, to obtain a hybrid ionogel where ionic liquid is covalently linked to silica domains. The morphology and the microstructure of the Si-IL xerogels were explored using NMR, SAXS and field emission scanning electron microscopy (FE-SEM). Cyclic voltammetry experiments were carried out to measure the apparent diffusion coefficient of the redox couple I/I3 into these Si-IL gels. The diffusion coefficient of triiodide in the gel is comparable to the one observed in a solvent-free based ionic liquid electrolyte. These Si-IL gels were evaluated as electrolytes in quasi-solid-state DSSCs. For this purpose, various DSSCs have been fabricated. The cells containing Si-IL ionogels with 50 wt% of a silica modified liquid ionic precursor exhibit a short-circuit photocurrent of 2.8 mA cm−2, an open circuit voltage of 680 mV, a fill factor of 0.65, and an overall efficiency of 1.25%. Accordingly, this work constitutes a proof of concept.

Graphical abstract: A one-pot route to prepare class II hybrid ionogel electrolytes

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Publication details

The article was received on 14 Oct 2013, accepted on 11 Nov 2013 and first published on 11 Nov 2013

Article type: Paper
DOI: 10.1039/C3NJ01272G
Citation: New J. Chem., 2014,38, 2008-2015

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    A one-pot route to prepare class II hybrid ionogel electrolytes

    O. Fontaine, A. Touidjine, M. Maréchal, C. Bonhomme, F. Ribot, B. Geffroy, B. Jousselme, C. Sanchez and C. Laberty-Robert, New J. Chem., 2014, 38, 2008
    DOI: 10.1039/C3NJ01272G

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