Three-dimensional microsphere-like cobalt-glycerolate strutted nickel hydroxidenitrate nanoflakes grown by hydrothermal method for asymmetric hybrid supercapacitors. (1st August 2022)

• Record Type: Journal Article
• Authors: Cui, Tao; Wu, Shang; Zhou, Sheng; Feng, Qiaoliang; Xu, Xin; Zhao, Huanlei; Su, Qiong; Wang, Yanbin; Zhao, Xiangfei; Yang, Quanlu
• Is Part Of: Journal of energy storage. Volume 52:Part A(2022)
• Publication Date: 2022-08-01
• Subjects: Asymmetric supercapacitors -- Core-shell structure -- Alkoxides -- Bismuth selenide -- High-energy; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.104730
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: The core-shell structure is always a greatly effective structure in asymmetric hybrid supercapacitor, duo to a high specific surface area and porosity that can accommodate partial expansion during the redox reaction. Herein, a cobalt-glycerolate@nickel hydroxidenitrate microsphere (CoG@Ni3 (NO3 )2 ·(OH)4 ) with core-shell structure is prepared by a simple two-step hydrothermal method. The as-produced CoG@Ni3 (NO3 )2 ·(OH)4 possesses extremely high specific capacity (265.9 mA h g −1 at 1 A g −1 ) and an excellent rate capability (with 75.5% of initial capacity at 10 A g −1 ). In addition, as an cathode material, flower-sphere-like Bi-Bi2 Se3 materials is selected to match a new CoG@Ni3 (NO3 )2 ·(OH)4 //Bi-Bi2 Se3 asymmetric supercapacitor. It exhibits a specific capacity (125.1 mA h g −1 at 1 A g −1 ) and an impressive rate property (with 77.6% of initial capacity at 10 A g −1 ). Satisfactorily, the asymmetric supercapacitor device, which cleverly assembles by the above two electrode materials, achieves impressive specific energy of 54 Wh kg −1 at 760 W kg −1, and a capacitance retention rate of 80% after 4000 cycles. The excellent performance of the asymmetric supercapacitor proves that the materials possess great potential in the energy storage field. Graphic abstract: Unlabelled Image Highlights: The CoG@Ni3 (NO3 )2 ·(OH)4 is prepared by a simple two-step method. The CoG@Ni3 (NO3 )2 ·(OH)4 with a core-shell structure can enhance capacity. The flower-sphere-like Bi-Bi2 Se3 materials was synthesized via one-step solvothermal method. The ASCs device exhibits excellent electrochemical performance.