Abstract
The composite electrodes are sustainable way of generating high-performance supercapacitor materials, and are easily synthesized via cost effective methods. Here, we state the synthesis of CuO, Ag2Se, CuO/Ag2Se (COAS) nanocomposites via a hydrothermal method specifically for energy conversion devices. The structural, morphological and textural properties of fabricated material are evaluated with scanning electron microscopy (SEM), x-ray diffraction (XRD), Brunauer Teller Emmett analyses (BET). The electrochemical efficiency of the generated materials is further determined using galvanostatic charge discharge (GCD), electrochemical imped-ance spectroscopy (EIS), cyclic voltammetry (CV), electrochemical active surface area (ECSA), electrochemical impedance spectroscopy (EIS), and chronoamperometry (CA) using Ni foam as conductive substrate under 2.0 M KOH electrolyte. Electrochemical results revealed about CuO/Ag2Se heterostructure displays specific capacitance (Cs) of 1543.42 F g(-1) at 1 A g(-1). COAS electrode has higher cycle stability, along with the capacitance of 97 % retained up to 2000 cycles at 1.5 A g(-1). In addition, COAS pseudocapacitor exhibited an energy density (Ed) of 34.81 Wh Kg(-1) and a power density (Pd) of 201.5 W Kg(-1). This study not only highlighted huge potential related to electrode material CuO/Ag2Se, as well as revolutionary approach for manufacturing affordable, multi element composite materials with high performance that may be applicable in an inclusive variety of applications in future era.