Enhanced rate capability of pseudocapacitive CuO by incorporation of Li for excellent composite electrode

Publication date: Available online 19 March 2019Source: Journal of Electroanalytical ChemistryAuthor(s): Ruey-Chi Wang, Po-Hsiang Huang, Ping-Chang Chuang, Yu-Cheng LinAbstractPseudocapacitive materials are promising to increase specific capacity of carbon-based electrodes, but suffer from poor rate capability. In the work, novel Li:CuO/reduced graphene oxide flexible electrodes demonstrate enhanced electrical conductivity and specific capacitance obtained via the incorporation of Li into CuO particles. The degree of capacitance enhancement increases with scan rate, reaching a maximum value of 40% at a high scan rate of 500 mV/s. Galvanostatic charge/discharge measurements show high volumetric capacitance, energy density, and power density. Cyclic life tests show excellent stability over 10,000 cycles, with a capacitance retention of 93.2% at a scan rate of 100 mV/s.Graphical abstractHigh-performance Li:CuO/RGO flexible electrodes for supercapacitors are demonstrated for the first time. Li doping enhances electrical conductivity, energy density, and rate capability of CuO/RGO electrodes, opening up the opportunity to fabricate low-cost and excellent supercapacitor electrodes.

Source: Journal of Electroanalytical Chemistry - March 21, 2019 Category: Chemistry Source Type: research