Charge transport in nonstoichiometric 2-fluoropyridinium triflate protic ionic liquids

摘要: Pyridinium triflate protic ionic liquids have been demonstrated to be highly dissociated, and nonstoichiometric compositions used in energy devices such as the all-organic proton battery. Herein, we use a combination of pulsed field gradient NMR spectroscopy electrochemical impedance investigate charge transport properties liquid 2-fluoropyridinium variation with acid doping level. While all diffusion coefficients decreased amount doping, room temperature conductivity increased due concurrent increase carrier concentration. The maximum was 7.33 mS/cm, obtained when 14% pyridine protonated triflic acid, while higher levels lead liquid/solid mixtures low conductivity. PEDOT supercapacitor cells this electrolyte very high capacitance (83.9 F/g) storage capacity (23.3 mAh/g). In addition predict that using lower level than previously will result superior performance batteries improvements conductivity, processability stability. (Less)