Evaluation of the operating potential window of electrochemical capacitors

摘要: Abstract Widening of the operating potential window is a straightforward route towards increasing specific energy electrochemical capacitors. Usually, assessment viable range committed to thermodynamic considerations over electrolyte and experimental probing stability both electrode materials through cyclic voltammetry. However, while former approach too conservative, latter prone failure. In present work, we consider quantitative approaches for monitoring influence on dissipative behaviour aqueous For proving concept underlying this analyse as case study an asymmetric cell with reduced graphene oxide/MnO2 positive carbon nanotube based negative electrode, well nominally symmetric cells assembled either electrode. We apply compare different procedures define safe these systems: usual opening technique, applied single electrodes or packed cells; non-conventional methods, analysis efficiency impedance function potential. Precisely, trend efficiency, derived from galvanostatic charge/discharge experiments, that real component vs. window, discriminate onset irreversible processes leading losses. The viability proposed methods reliability attendant criteria are finally checked in light results cycling performance cell.