Supercritical CO2 aided polyindole-graphene nanocomposites for high power density electrode
1Department of Chemistry, G. B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, 263145, India
2Department of Chemistry, Lovely Professional University, Phagwara, Punjab, 144411, India
Adv. Mater. Lett., 2017, 8 (3), pp 269-275
Publication Date (Web): Jan 28, 2017
Copyright © IAAM-VBRI Press
A series of Polyindole/Graphene nanocomposites (PGNCs) as electrochemical energy storage materials were fabricated at varying concentration (%, w/w) of graphene raging 3.0–9.0 in Polyindole (PIN) matrix in Supercritical CO2. The electrochemical behavior of PGNC prepared at different proportion of graphene was investigated. The PGNC@9% has rendered specific capacitance of 389.17 F/g, along with energy and power densities of 13.51 Wh/kg and 511.95 W/kg respectively, which is greater as compared to graphene prepared through thermal reduction of graphene oxide. However, PIN comprises low capacitance of 24.48 F/g. Successive scans of PGNCs electrode for 1000 cycles at the scan rate of 0.1 V/s in KOH (1.0 M) shows a capacitive retention of ~98.6% indicating the electrochemical stability of the electrodes, with successive charge-discharge behavior. PGNCs display all the major peaks in Fourier Transform-Infrared and X-Ray diffraction spectra. Scanning electron micrograph in permutation with XRD spectra indicates the exfoliation of graphene into the matrix of PIN. Simultaneous TG-DSC reveals increased thermal stability of PGNCs with fractions of graphene. The good capacitive and charge-discharge performance indicates that supercritically fabricated PGNCs may serve as potential electrode materials for electrochemical energy storage devices.
Graphene, nanocomposites, polyindole, scCO2, specific capacitance, sulphonated polysulphone.