High energy and power density of self-grown CuS@Cu2O core-shell supercapattery positrode

A self-grown copper sulfide@copper oxide (CuS@Cu2O) positrode synthsis by a hydrothermal method followed by 2 h of air annealing method (at 300 degrees C) from copper-foam (Cu-F) is envisaged as supercapattery electrode material in 0.1 M KOH electrolyte solution where remarkable capacities of 145, 134, 125, and 112 mA h g(-1) at current densities of 1, 2, 3, and 4 A g(-1), respectively, with about 80% retention ability after 2000 redox cycles, are obtained. The electrochemical performance obtained for self-grown CuS@Cu2O positrode is better than those reported previously for self-gown CuS, Cu(OH)(2), and CuO electrode materials. An asymmetric supercapattery device fabricate using CuS@Cu2O as a positrode with Bi2O3 as negatrode, i.e., CuS@Cu2O//Bi2O3, demonstrates an energy density of 52 Wh kg(-1) at a power density of 750 W kg(-1) at 0.5 A g(-1) which, when connected in series with another similar device, lightens a LED with its full-bright intensity, confirming a commercial potential of designed electrochemical supercapattery device.