Electrochemical synthesis of S-doped cobalt–copper layered double hydroxide for energy storage systems

Electrochemical capacitors, also called supercapacitors, have attracted increasing interest over the past few years due to their potential to deliver high power density in a very short time, their excellent cyclability [1], Recently, transition metal sulfides including binary cobalt sulfides, nickel sulfides, copper sulfides, and ternary copper cobalt sulfides have been investigated as novel supercapacitor electrode materials with improved electrochemical performance [2], In this study, two-layered copper-cobalt hydroxide and nanostructure of copper-cobalt-sulfide were synthesized on nickle foam: The electrochemical behavior of nanostructured compounds obtained as supercapacitor electrode materials were studied. In addition to the proper conductivity and durability of the nanoscale, the materials are fixed in the foam pores and provide a high effective surface, which leads to increased electrochemical reaction and the capacity. In this Synthesis 0.01 M of (Co(NO3)2.6H2O), 0.005 M of (Cu(NO3)2.3H2O) and 0.75 M Tu were solved in 30ml DI water and a potential of -0.1 V (Ag/AgCl) by simple method of electrochemical was done. The FESEM image explain the CuCo2S4 nanosheets (Fig. 1) In the next step, electrochemical performance of the synthesized compounds on nickle foam as the supercapacitor electrode material were investigated by using cyclic voltammetry (CV) and charge-discharge (CD) in a 1 M KOH. Finally, the maximum capacitance 255 and 1565 F g-1 were obtained at a current density of 1 A g-1 for the nanostructure of copper-cobalt and copper-cobalt-sulfide in a three electrode system, respectively. Also, the energy density 65.75 wh Kg-1 and power density 0.252 Kw kg-1 were obtained for copper-cobalt-sulfide nanostructure.