Facile Synthesis and Optimization of CuO/Cu(OH)2 Nanostructures on Cu-Foil for an Energy Storage Application

Abstract

In the present work, an endeavor has been made to develop an effective and binder-free CuO/Cu(OH)2 nanostructure based electrode by facile one-step solution-immersion method. FESEM, XRD and Raman spectroscopy are utilized to identify structural and morphological character of the prepared CuO/Cu(OH)2 nanostructures on the Cu foil. The electrochemical analysis has shown that CuO/Cu(OH)2 nanostructures developed on the Cu foil upon immersion in 0.15 M ammonium persulfate based aqueous solution for 100 min, have displayed a very high specific capacity of 339.7 C g–1/303.7 C g–1 at scan rate 10m V s–1/current density 3.33 A g–1. After 1000 cycles of galvanostatic charge-discharge at a high current density of 10 A g–1, CuO/Cu(OH)2 nanostructures based binder-free electrode has shown no decrease of specific capacity, instead an increase in the value of specific capacity by ~26% is observed. The cyclic voltammetry, galvanostatic charge discharge as well as electrochemical impedance spectroscopic results are justifying the potential candidature of CuO/Cu(OH)2 nanostructures on copper foil as a high performance, binder-free, battery-type electrode for hybrid supercapacitor application.