Nanoscale characterization of the site?specific degradation of electric double?layer capacitor using scanning electrochemical cell microscopy

Electric double-layer capacitors (EDLCs) that store electrical energy in the interface between an electrolyte and a solid electrode are favorable storage systems demonstrate high-power density, excellent cycle stability, low environmental impact. To increase operating voltage improve capacitance of EDLCs, it is essential to investigate relationship degradation process structural properties activated carbon. In current study, we used scanning electrochemical cell microscopy (SECCM) assess site-specific mechanisms caused by decomposition. simplify carbon, highly oriented pyrolytic graphite (HOPG) as model substrate distinguish edge basal planes The mobile nanoscale provides local cyclic voltammetry (CV) examine difference at HOPG. SECCM's can suppress impact capacitive therefore be clearly measure associated with CV measurements directly exposed reaction occurred plane positive potential range.