Enhanced capacitive behaviour of graphene based electrochemical double layer capacitors by etheric substitution on ionic liquids

In this study, we report the effect of etheric substituents in imidazolium and ammonium based ionic liquids (IL) on the performance of electrochemical double layer capacitors (EDLC) consisted of gel polymer electrolyte (GPE) and reduced graphene oxide (RGO) electrode. GPEs contain poly (vinylidene f...

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Bibliographic Details
Published in:Journal of power sources 2020-08, Vol.467, p.228353, Article 228353
Main Authors: Siyahjani, Shirin, Oner, Saliha, Diker, Halide, Gultekin, Burak, Varlikli, Canan
Format: Article
Language:English
Subjects:
EDLC
Energy density
Gel polymer electrolyte
Specific capacitance
Viscosity
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Summary:In this study, we report the effect of etheric substituents in imidazolium and ammonium based ionic liquids (IL) on the performance of electrochemical double layer capacitors (EDLC) consisted of gel polymer electrolyte (GPE) and reduced graphene oxide (RGO) electrode. GPEs contain poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) and the ILs. Ammonium and imidazolium based ionic liquids (ILs) differ by their length of etheric groups and etheric group contents, respectively. According to the cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy measurements, longer etheric group substituted {N-methyl-2-(2-methoxyethoxy)-N,N-bis[2- (2-methoxyethoxy)ethyl] ethan-1-aminium bis(trifluoromethanesulfonyl)imide (AMEt-TFSI) and ether substituted {3-allyl-1-[2-(2-methoxyethoxy)ethyl]-1H-imidazole-3-ium bis(trifluoromethanesulfonyl)imide (AL3IL-TFSI), tender specific capacitances of 250 Fg-1 and 238 Fg-1 and energy density values of 61.36 wh kg−1 and 61.56 wh kg−1, respectively. [Display omitted]
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2020.228353