Combining electrochemical, molecular simulation and operando techniques to investigate the stability of electrodes and organic electrolytes used in EDLCs

•Identifying and analyzing residual gasses in EDLCs filled with organic electrolytes.•Understanding the energy storage mechanism in organic-based supercapacitors.•Raman & FT-IR operando, Mass Spectrometry, and Electrochemical methods to investigate electrode and electrolyte stabilities.•Ions adsorbed at the electrode/electrolyte interface affect local potential and the electrode Fermi level.