Elucidating the Iron-Based Ionic Liquid [C4py][FeCl4]: Structural Insights and Potential for Nonaqueous Redox Flow Batteries |
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| Authors: | Christian Balischewski Biswajit Bhattacharyya Josh J. Bailey Scott D. Place Peter Nockemann Jiyong Kim Armin Wedel Shashank Gahlaut Ilko Bald Weiyang Li Yann Garcia Eric Sperlich Christina Günter Alexandra Kelling Andreas Taubert |
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| Affiliation: | 1. Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24–25, D-14476 Potsdam, Germany;2. The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University Belfast, Stranmillis Road, Belfast, BT9 5AG UK;3. Functional Materials and Devices, Fraunhofer Institute of Applied Polymer Research (IAP), Geiselbergstraße 69, D-14476 Potsdam, Germany;4. Institute of Condensed Matter and Nanosciences, Molecular Chemistry, Materials and Catalysis (IMCN/MOST), Université Catholique de Louvain, Place L. Pasteur 1, Louvain-la-Neuve, 1348 Belgium;5. Institute of Geosciences, University of Potsdam, Karl-Liebknecht-Strasse 24–25, D-14476 Potsdam, Germany |
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| Abstract: | In this study, a low-melting organic-inorganic crystalline ionic liquid compound, N-butyl pyridinium tetrachlorido ferrate (III) is described. The material can easily be synthesized using a one-pot approach in an ionic liquid medium. Single-crystal X-ray diffraction confirms that the basic inorganic block is [FeCl4]−, which is counterbalanced by an N-butyl pyridinium cation. The compound exhibits a melting point of 37.6 °C by differential scanning calorimetry, which is among the lowest values for a pyridinium-based metal-containing ionic liquid. The material shows promising electrochemical behavior at room temperature in both aqueous and nonaqueous solvents, and at elevated temperatures in its pure liquid state. Given its appreciable solubility in both water and acetonitrile, the compound can act as a redox-active species in a supporting electrolyte for redox flow battery applications. These classes of low-melting ionic solids with long-range order and interesting electrochemical applications are potential candidates for a range of green energy storage and harvesting systems. |
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| Keywords: | chloridoferrate(III) Ionic liquids redox flow battery |
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