1. Institute of Macromolecular Compounds,Russian Academy of Sciences,Bolshoy pr.31,Saint Petersburg 199004,Russia
折叠
Abstract
Green method for preparation of ion-conducting membranes(ICM)based on bacterial cellulose nanofibers(CNF)modified by a copolymer of sodium acrylate and 2-acrylamido-2-methylpropanesulfonic acid was elaborated.FTIR and NMR data confirmed grafting of poly-acrylate onto cellulose surface.Formation of porous structure of the ICM was controlled by SEM and AFM.The maximal ionic conductivity of the membranes reaches 1.5 and 3.1 mS·cm-1(60 ℃ and 98％relative humidity)when they are saturated with water or H2SO4(1 mol.L-1)electrolyte,respectively.Prepared ICM was tested as a separator in a symmetrical supercapacitor with electrodes based on polyaniline hydrogel.The assem-bled cell demonstrate ability to operate at high current density up to 100 A·g-1 maintaining specific capacitance 165 F·g-1.Maximal specific ca-pacitance of 289 F·g-1 was achieved at current density 1 A·g-1.Retaining of 90％of initial capacitance after 10000 of charge-discharge cycles proves high electrochemical stability of prepared ICM.
维普
万方数据