a b s t r a c t Single-walled carbon nanotubes (SWCNTs)were investigated by cyclic voltammetry and electrochemical impedance spectroscopy in a non-aqueous electrolyte, 1M Et4NBF4 in acetonitrile, suitable for supercapacitors. Further, in situ dilatometry and in situ conductance measurements were performed on single electrodes and the resultscompared to an activated carbon, YP17. Both material…