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Supercapacitors (aka electrostatic double-layer capacitors -- EDLCs) offerexcellent power storage capacity and kinetics, but suffer under rapidself-discharge. We introduced a zeolite framework into the active capacitorelectrode, with the goal to tailor the free desorption energy and thus theself-discharge rate of supercapacitors. Low-cost carbonaceous materials andbenchtop production methods were used to create supercapacitor electrodes witha measured specific capacitance of 17.25 F g$^{-1}$, a coulombic efficiency of100%, and charge retention of over 25% over 24 hours determined bygalvanostatic charge/discharge curve measurements. This charge retention was anenhancement of $\sim$350% compared with electrodes without zeolite coating.

Suppressed self-discharge of an aqueous supercapacitor using Earth-abundant materials