Electrochemical investigation of ionic liquid-derived porous carbon materials for supercapacitors: pseudocapacitance versus electrical double layer
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Rocha, Raquel P.
Krstić, Jugoslav B.
Trtić-Petrović, Tatjana M.
Figueiredo, Jose L.
Article (Published version)
© 2018 Elsevier Ltd
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This work shows the potential application of carbon materials prepared by three different ionic liquid-based methods, using 1-butyl-3-methylimidazolium methanesulfonate [bmim][MeSO3], for electrochemical supercapacitors. The effects of [bmim][MeSO3] on morphology, texture and surface chemistry of prepared materials has been explored by SEM/TEM, N2/CO2 adsorption measurements and XPS. The results indicate the possibility of synthesis of carbon materials with tunable physicochemical properties using ionic liquid based methods. The charge storage behavior of all materials was studied in three different pH aqueous electrolytes. The pseudocapacitive and double layer contributions were estimated and discussed from the aspect of the textural changes and the changes of the chemical composition of surface functional groups containing heteroatoms. C[dbnd]O type functional groups, with the contribution of COOH groups, were found to be responsible for a different amount of charge, which could be s...tored in alkaline and acidic electrolytic solution. The material prepared by direct carbonization of [bmim][MeSO3], showed the best electrochemical performance in alkaline electrolyte with a capacitance of 187 F g−1 at 5 mV s−1 (or 148 F g−1 at 1 A g−1), due to the contribution of both electric-double layer capacitance and pseudocapacitance which arises from oxygen, nitrogen and sulfur functional groups. © 2018 Elsevier Ltd
Keywords:Supercapacitors / Charge storage / Pseudocapacitance / Ionic liquids / Carbon materials
Source:Electrochimica Acta, 2019, 298, 541-551
- Physics and Chemistry with Ion Beams (RS-45006)
- Lithium-ion batteries and fuel cells - research and development (RS-45014)
- Nanostructured Functional and Composite Materials in Catalytic and Sorption Processes (RS-45001)
- Project "AIProc-Mat@N2020-Advanced Industrial Processes and Materials for a Sustainable Northern Region of Portugal 2020" - Norte Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund (ERDF) (NORTE-01-0145-FEDER-000006)
- Project POCI-01-0145-FEDER-006984 - Associate Laboratory LSRE-LCM funded by ERDF through COMPETE2020-Programa Operacional Competitividade e Internacionalizacao (POCI)
ISSN: 0013-4686 (print); 1873-3859 (electronic)