Effect of cobalt hydroxide deposition on the Diffusion-Controlled contribution of cobalt Sulfide-Manganese sulfide electrode for supercapattery

Abstract

The performance of supercapattery depends on the diffusion rate of the electrolyte ions on the electrode. Metal sulfides have low electrical conductivity and this will affect the active surface reacting with the electrolyte during the charge and discharge processes. In this work, cobalt sulfide-manganese sulfide (CMS) was synthesized via hydrothermal reaction. In order to enhance the channels for the diffusion of electrolyte ions, cobalt hydroxide (COH) was grown on the CMS layer. The structural and morphological of the samples were characterized and the final material was confirmed to be a petal-shaped CMS/COH nanocomposite. CMS/COH showed a higher specific capacity (777.5 C/g at 1 A/g) and a higher diffusion contribution than those of CMS, except for the rate capability. CMS/COH in supercapattery form was designed and the cycle stability was found to reach 72% after 6000 cycle repetitions.