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

Siyahjani S., Oner S., Diker H., GÜLTEKİN B., Varlikli C.

JOURNAL OF POWER SOURCES, vol.467, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 467
  • Publication Date: 2020
  • Doi Number: 10.1016/j.jpowsour.2020.228353
  • Journal Name: JOURNAL OF POWER SOURCES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Keywords: Gel polymer electrolyte, EDLC, Specific capacitance, Energy density, Viscosity, GEL POLYMER ELECTROLYTES, 4 V, SUPERCAPACITOR, ELECTRODES, REDUCTION, STABILITY, VISCOSITY, ANIONS
  • Middle East Technical University Affiliated: No

Abstract

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-hexafluompropylene) (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 chargedischarge 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(tri-fluoromethanesulfonyl)imide (AMEt-TFSI) and ether substituted (3-allyl-1-[2-(2-methoxyethoxy)ethyl]-1H-imidazole-3-ium bis(trifluommethanesulfonyeimide (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.