Carbon foam@reduced graphene oxide scaffold grown with polyaniline nanofibers for high performance symmetric supercapacitor. (20th January 2019)

• Record Type: Journal Article
• Authors: Hong, Xiaodong; Lu, Yugang; Li, Shunli; Wang, Xuelei; Wang, Xiaowei; Liang, Ji
• Is Part Of: Electrochimica acta. Volume 294(2019)
• Page Start: 376
• Page End: 382
• Publication Date: 2019-01-20
• Subjects: Carbon foam -- Graphene oxide -- Polyaniline -- Supercapacitor -- Electrochemical performance; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.10.133
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: To overcome the low capacitance of carbon foam and achieve a high utilization of polyaniline (PANI) pseudocapacitance, graphene nanosheets are filled into carbon foam framework to form a scaffold, and subsequently growing PANI nanofibers to prepare a ternary composite. In this material, carbon foam provides three-dimensional macroporous conductive framework, graphene nanosheets on the carbon foam framework support the deposition of PANI and increase the PANI loading, while much PANI nanofibers contribute a high pseudocapacitance. Therefore, this rationally designed ternary composite not only achieves a high PANI loading of 85.5%, but also exhibits a high specific capacitance and a high utilization of PANI capacitance. As self-supporting electrodes in a symmetrical two-electrode supercapacitor, a high capacitance of 868.5 F g −1 is achieved, in which, the capacitance contributed by PANI reaches 1003 F g −1, more than a half of its theoretical value, furthermore, the capacitance retention is 94.1% after 2000 cycles at 10 A g −1 . The design principle of this ternary composite is simple and facile, which can be extended to prepare other nanocomposites containing metal oxides, sulfides, etc. for potential electrochemical applications. Graphical abstract: Highlights: Graphene nanosheets loading on the CF framework serving as a porous scaffold. CF@RGO/PANI ternary composite is designed for symmetric supercapacitors. Capacitance of CF@RGO/PANI-0.5 (85.5 wt% PANI) is 868.5 F g −1 at 1 A g −1 . Capacitance contributed by PANI nanofibers reaches 1003 F g −1 at 1 A g −1 .