Mesoporous graphene nanoflakes for high performance supercapacitors with ionic liquid electrolyteстатьяИсследовательская статья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 28 февраля 2020 г.
Аннотация:Mesoporous graphene nanoflakes (GNFs) of different thickness with a specific surface area of 660–1720 m2/g were produced by the template synthesis via hexane pyrolysis over MgO. The structure and morphology of GNFs were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy and low-temperature N2 physisorption. The electrochemical performance of GNF-based
supercapacitors was tested in ionic liquid electrolyte (1.2 M NþEt4TFSI in CH3CN) by cyclic voltammetry and galvanostatic charge – discharge measurements.The assembled symmetric supercapacitors with a wide voltage window of 3 V delivered specific capacitance of 112 F/g at 5 mV/s and 105 F/g at 0.5 A/g with a high rate capability of ~81% at a current density of 15 A/g. The energy density reached 32.8 Wh/kg corresponding to the power density of 0.7 kW/kg. Furthermore,even at a high power density of 19.9 kW/kg, GNFs still showed an energy density of 24.3 Wh/kg, which made them promising for application in supercapacitors.