Effect of CuO/rGO and ZnO/rGO Hybrid Additional Layers on Supercapacitor Performance

Increasing the specific electrical capacitance of supercapacitors has been received great attention from both researchers and industry. Herein, how to achieve this by coating surface reduced graphene oxide (rGO) with copper(II) (CuO) zinc (ZnO) is reported. The CuO/rGO ZnO/rGO hybrid layers were prepared via chemical reactions between (GO) salts copper zinc, respectively. crystallographic structures morphologies composite materials studied using X-ray diffraction (XRD) scanning electron microscopy (SEM), Cyclic voltammetry (CV) measurements used analyze electrochemical properties composites. results show that CuO ZnO increased rGO, while have good stability a higher capacity (465.73 F×g−1) than (167.52 F×g−1), (185.48 rGO (113.50 annealed graphite (53.12 F×g−1). mechanism increasing depending on whether act as pseudocapacitor and/or an double-layer capacitor elucidated.
 HIGHLIGHTS
 
 One challenging problem for supercapacitor improvement its capacitance
 salts
 better CuO/rGO, ZnO/rGO, graphite
 GRAPHICAL ABSTRACT