Correlation between capacitances of porous carbons in acidic and aprotic EDLC electrolytes |
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| Institution: | 1. Instituto Nacional del Carbón-C.S.I.C., Apartado 73, 33080 Oviedo, Spain;2. Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland;3. IMT-Chimie des Surfaces, Université de Neuchâtel. Rue Emile, Argand 11, CH-2009 Neuchâtel, Switzerland;1. College of Material Science and Engineering, Chongqing University, Chongqing, 400044, PR China;2. National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing, 400044, PR China;3. School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea;4. Institute of Chemical and Engineering Sciences, A*STAR, 1 Pesek Road, Jurong Island, 627833, Singapore;1. Shenzhen Key Laboratory of Advanced Materials, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;2. Center for Biofluid and Biomimic Research, Pohang University of Science and Technology (POSTECH), Pohang 790-784, South Korea;3. Research Institute of Tsinghua University in Shenzhen, Shenzhen 518055, China;1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Advanced Research Center, Saga University, 1341 Yoga-machi, Saga 840-0047, Japan |
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| Abstract: | A study based on a total of 41 nanoporous carbons shows that there exists a good correlation between the limiting gravimetric capacitances Co at low current densities j (1 mA cm−2) measured in aprotic (1 M (C2H5)4NBF4 in acetonitrile) and in acidic (2 M aqueous H2SO4) electrolytes. The comparison of the surface-related capacitances (F m−2) of well characterized samples with the amount of thermodesorbed CO suggests a strong contribution of CO generating surface groups to charge storage in the acidic electrolyte, but a negligible contribution in the aprotic medium. It also appears that the decrease of the capacitance with current density is similar in both electrolytes. This confirms that the average micropore width and the CO2 generating surface groups are the main factors which limit the ionic mobility in both electrolytes. |
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