Effect of binder on electrochemical performances of MnO₂/CuS/rGO materials

Supercapacitors are at the forefront of the development of sustainable physical energy storage systems. This is due to their higher power, energy density, and longer life as compared to regular capacitors. In this paper, MnO₂/CuS/rGO was synthesized and characterized. We have synthesized MnO₂/ CuS/rGO nanocomposites by wet chemical method. To synthesize MnO₂/CuS/rGO nanocomposites, desired amount of rGO was dissolved in a water-ethanol solution and stirred for 15 minutes and then appropriate amount of CuS [synthesized earlier] was added to this solution. After stirring for 15 minutes, we added desired amount of KMnO₄ in this solution and then stirred for 1 hr. The resulting precipitate of as-synthesized nanocomposites was recovered using a centrifuge, washed with DI water, and dried in air for 24 hours. The slurry of the synthesized materials was prepared by mixing synthesized materials, carbon black and PVDF binder in a ratio of 80:10:10, and 80: 15:05 wt%, respectively, using N-methyl pyrrolidone as a solvent. The slurry was then coated onto precleaned Ni mesh and dried overnight. The electrochemical characterization was carried out in 1M Na₂SO₄ solution using fabricated electrode, platinum wire, and Ag/AgCl electrode as a working, counter, and reference electrodes, respectively. The physical and electrochemical results will be presented in detail at the conference.