The synergistic effect of carbon nanotubes and graphitic carbon nitride on the enhanced supercapacitor performance of cobalt diselenide-based composites. (2nd August 2021)

• Record Type: Journal Article
• Authors: Li, Mingjie; Zheng, Xuan; Xie, Lixiang; Yu, Youjun; Jiang, Jinlong
• Is Part Of: New journal of chemistry. Volume 45:Number 32(2021)
• Page Start: 14808
• Page End: 14814
• Publication Date: 2021-08-02
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d1nj02533c
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Carbon nanotubes and g-C3 N4 synergistically optimize the electrical conductivity and spatial structure of CoSe2, thus improving the performance of supercapacitors. Abstract : Recently, transition metal selenides have been investigated extensively as promising electrode materials for high-performance supercapacitors. Herein, multi-component CoSe2 /CNTs@g-C3 N4 composites are prepared using a two-step hydrothermal method by incorporating one-dimensional CNTs and two-dimensional g-C3 N4 nanosheets to form a network-like structure. The CoSe2 /CNTs@g-C3 N4 composite with a mass ratio of 1 : 3 (CNTs to g-C3 N4 ) shows an ultra-high specific capacity of 445.4 mA h g −1 (3563.0 F g −1 ) at 1 A g −1, which is more than 2 times that of pure CoSe2 . The assembled asymmetric supercapacitor based on CoSe2 /CNTs@g-C3 N4 delivers a high energy density of 77.1 W h kg −1 at 850 W kg −1 . The striking capacitive performance is ascribed to the multi-dimensional synergistic contribution of two kinds of carbon materials to the electric conductivity and spatial structure of the composites, involving the improved charge transfer due to connecting g-C3 N4 and the active CoSe2 by the high conductive CNT bridges, and the short ion diffusion pathways on the porous carbon framework constructed by g-C3 N4 nanosheets with the assistance of CNTs.