Construction of three-dimensional graphene like carbon on carbon fibers and loading of polyaniline for high performance asymmetric supercapacitor. (1st March 2020)

• Record Type: Journal Article
• Authors: Ou, Dawei; Liu, Jiaqin; Yan, Jian; Qin, Qingqing; Xu, Jun; Wu, Yucheng
• Is Part Of: Electrochimica acta. Volume 335(2020)
• Publication Date: 2020-03-01
• Subjects: 3D graphene like carbon -- Hierarchical structure -- Carbon fiber -- Polyaniline -- Asymmetric supercapacitor; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.135679
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Integrated three-dimensional (3D) hierarchical carbons are of particular interest to supercapacitors since they are good matrix for supporting active materials. Hereby, we have developed a simple strategy to construct 3D graphene like thin carbon sheets on carbon fiber paper (3DGC-CFP) using a template method according to the presence of glucose at high temperature. The 3DGC-CFP exhibits high surface area, good conductivity and good mechanical property, and could bear compression, which could enhance the performance of active materials. After coating of polyaniline (PANI), 3DGC/PANI-CFP has been fabricated, which shows a high specific capacitance of 1013 F g −1 at 1 A g −1 and good cycling stability. Furthermore, an asymmetric supercapacitor has been assembled using 3DGC/PANI-CFP and activated carbons (AC). It exhibits a high cell specific capacitance of 151.8 F g −1 within 1.6 V according to a specific energy of 54 Wh kg −1 . A simple model has been developed to reveal the influence of mass ratio between negatvie and positive electrodes on the cell performance. In addition, the temperature effect on the cell performance has also been evaluated in view of practical applications. This work sheds light on constructing integrated 3DGC-CFP and loading of PANI for supercapacitor applications. Graphical abstract: Figure caption: FESEM images of the 3DGC-CFP (up left and up right), FESEM image of the 3DGC/PANI-CFP (down left), the specific capacitances of asymmetric device based on 3DGC/PANI-CFP and activated carbon obtained at various potential windows and current densities. Image 1 Highlights: 3D graphene like thin carbon sheets grown on carbon fiber paper have been synthesized. The 3DGC-CFP is porous, conductive and shows high mechanical stability. 3DGC/PANI-CFP shows a high specific capacitance of 1013 F g −1 at 1 A g −1 . Asymmetric device of 3DGC/PANI-CFP//AC exhibits a high specific energy of 54 Wh kg −1 . A model has been developed to reveal the influence of cell designing on the performance.