Solid-state NMR Study of Ion Adsorption and Charge Storage in Graphene Film Supercapacitor Electrodes.

ABSTRACT: Graphene film has been demonstrated as promising active materials for electric double layer capacitors (EDLCs), mainly due to its excellent mechanical flexibility and freestanding morphology. In this work, the distribution and variation pattern of electrolyte ions in graphene-film based EDLC electrodes are investigated with a ¹¹B magic-angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy. For neutral graphene films soaked with different amounts of electrolytes (1 M TEABF₄/ACN), weakly and strongly adsorbed anions are identified based on the resonances at different ¹¹B chemical shifts. Unlike other porous carbonaceous materials, the strongly adsorbed anions are found as the major electrolyte anions components in graphene films. Further measuremen

SUBMITTER: Li K 

PROVIDER: S-EPMC5175154 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature