In-situ facile synthesis of flower shaped NiS2@regenerative graphene oxide derived from waste dry battery nano-composites for high-performance supercapacitors. (October 2020)

• Record Type: Journal Article
• Authors: Zhang, Longwen; Guo, Hao; Xue, Rui; Yue, Liguo; Li, Qi; Liu, Hui; Yang, Wenhu; Wang, Xiaoqiong; Yang, Wu
• Is Part Of: Journal of energy storage. Volume 31(2020)
• Publication Date: 2020-10
• Subjects: Supercapacitors -- Dry battery -- NiS2 -- Regenerative GO -- High performances; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2020.101630
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: The material derived from used dry batteries saves the waste of resources. The in-situ grown nanoflower Re-GO@NiS2 has ultrahigh specific capacitance. Assembled ASC shows high energy and power density and superior cycling stability. Abstract: Regenerative graphene oxide (Re-GO) with two-dimensional loose structure is obtained from carbon rods of waste dry batteries by freeze-drying post-processing method. This not only reduces resource waste but also generates a new device for energy storage. Transition metal sulfides are in-situ grown on Re-GO surface as high-performance electrode material for supercapacitors. Facile synthesis of the three-dimensional nanoflower structure Re-GO@NiS2 shows many excellent electrochemical properties, combining the stability of the carbon material and high specific capacitance of transition metal sulfides. The maximum specific capacitance is 1932.5 Fg −1 at a current density of 1 Ag −1 in a three-electrode system. Furthermore, as-assembled Re-GO@NiS2 //Re-GO assymmetric supercapacitor (ASC) exhibits the specific energy of 28.31 Whkg −1 at specific power of 800 Wkg −1 . As a result, this work provides an effective route to dispose of waste dry battery and regenerate it for supercapacitor applications. Graphical abstract: Image, graphical abstract