Capacitance response of carbons in solvent-free ionic liquid electrolytes |
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| Institution: | 1. Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan;2. Central Geological Survey, P.O. Box 968, New Taipei City 235, Taiwan;1. Materials Science and Engineering Department, Institute of Space Technology, 44000 Islamabad, Pakistan;2. Advance Polymer Laboratory, Pakistan Institute of Engineering and Applied Sciences, 45650 Islamabad, Pakistan;3. University of Engineering and Technology, 47050 Taxila, Pakistan;1. Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum Univerità di Bologna, Via Selmi 2, 41026 Bologna, Italy;2. BETTERY s.r.l., Via Pisacane 56, 74016 Massafra (TA), Italy;1. Department of Chemical and Biological Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju-si, Chungbuk 380-702, Republic of Korea;2. Climate Change Research Division, Korea Institute of Energy Research, Daejeon 305-343, Republic of Korea;3. Department of Chemical Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Republic of Korea;4. Graduate School of Transportation, Korea National University of Transportation, Uiwang-si, Gyeonggi-do 437-763, Republic of Korea;5. Department of IT Convergence, Korea National University of Transportation, Chungju-si, Chungbuk 380-702, Republic of Korea |
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| Abstract: | Ionic liquids (IL) are very promising “solvent-free” electrolytes for high-voltage double-layer supercapacitors (EDLCs) and to this purpose they are generally selected on the basis of their bulk properties, such as electrochemical stability and ion conductivity, without taking into account those of the electrified electrode-IL interface. This interface, which has yet to be well characterized, has features that notably affect electrode capacitance, and our paper for the first time highlights the importance of the molecular chemistry and structure of the ions for the double-layer capacitive response of carbonaceous electrodes in IL. The double-layer capacitive responses of negatively charged electrodes based on activated carbons and aero/cryo/xerogel carbons in two ILs featuring the same anion and different cations of almost the same size, i.e. the N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI) and 1-ethyl-3-methyl-imidazolium bis(trifluoromethanesulfonyl)imide (EMITFSI) are reported. The porosity, structure and surface chemistry of the carbons are compared to their capacitive response to evince the role played by these carbon properties and by the chemistry and structure of the IL ions in the electric double-layer. |
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