Study of the aging process of nanostructured porous carbon-based electrodes in electrochemical capacitors filled with aqueous or organic electrolytes

•Evaluation of electrode surface chemistry after aging in aqueous and organic electrolytes.•OperandoRaman analyses of the carbon-based electrodes after the aging process.•Contrasting the aging process in aqueous and organic electrolytes.•Reversible shift of the Raman peak position during polarization.•Changes in the electrical double-layer assessed by Raman spectroscopy.