Chemical route to the synthesis of novel ternary CuCr2S4 cathodes for asymmetric supercapacitors. (15th December 2022)

• Record Type: Journal Article
• Authors: Bulakhe, Ravindra N.; Ryu, Changyoung; Gunjakar, Jayavant L.; In, Jung Bin
• Is Part Of: Journal of energy storage. Volume 56:Part C(2022)
• Publication Date: 2022-12-15
• Subjects: Cu-Cr disulfide -- Asymmetric supercapacitor -- Specific capacity -- Porosity -- Specific energy; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.106175
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: Transition metal dichalcogenides (TMDs) are valuable for various energy-storage applications due to their layered structures. To date, while several physical methods have been employed for the preparation of TMDs, very few chemical synthesis reports are available. Herein, novel CuCr2 S4 (CCS) electrodes are chemically prepared using a simple and inexpensive hydrothermal method and investigated for supercapacitor applications for the first time. The CCS electrodes are highly porous with high specific surface areas (173–274 m 2 /g) and hence provide more electrochemically active sites, resulting in high capacities. The optimized CCS electrode exhibits a maximum specific capacity of 1807 C/g at a scan rate of 2 mV/s. Furthermore, when an asymmetric supercapacitor (ASC) is fabricated using the CCS and reduced graphene oxide electrodes, the ASC delivers a specific capacity of 210.6 C/g, a high specific energy of 65.83 Wh/kg, and a specific power of 750 W/kg at a current density of 1 A/g. Moreover, the ASC demonstrates an excellent cycling stability of 90 % over 10, 000 charge/discharge cycles. Results suggest that the chemically prepared CCS is an excellent electrode material for high-performance ASCs. This study will significantly expand the possibilities for the development of TMD-based novel electrodes for high-performance energy-storage devices. Highlights: Mesoporous CuCr2 S4 (CCS) is chemically synthesized by a facile hydrothermal method. The CCS electrode exhibits a high specific capacity of 1807 C/g at a scan rate of 2 mV/s. Asymmetric supercapacitors (ASC) are fabricated by combining CCS and reduced graphene oxide electrodes. The optimal ASC exhibits a high specific energy of 65.8 Wh/kg with 90 % cyclic stability over 10, 000 charge/discharge cycles.