Facile synthesis of novel sulfonated polyaniline functionalized graphene using m-aminobenzene sulfonic acid for asymmetric supercapacitor application

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2017-01, Vol.308, p.1174-1184
• Main Authors: Bandyopadhyay, Parthasarathi, Kuila, Tapas, Balamurugan, Jayaraman, Nguyen, Thanh Tuan, Kim, Nam Hoon, Lee, Joong Hee
• Format: Article
• Language: English
• Subjects: Asymmetric supercapacitor; Energy density; Pseudocapacitance; Reduced graphene oxide; Specific capacitance
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2016.10.015

[Display omitted] •Novel sulfonated polyaniline functionalized graphene composite was prepared.•An asymmetric supercapacitor (ASC) device was fabricated and tested.•ASC exhibited maximum specific capacitance of about 156Fg−1.•The device exhibited 94% retention in specific capacitance after 5000 cycles.•The device exhibited a superior energy-storage capacity. Sulfonated polyaniline (SPANI) functionalized reduced graphene oxide (SPANI/G-1) was prepared by aniline initiated polymerization of m-aminobenzene sulfonic acid in presence of graphene oxide (GO), followed by reduction with hydrazine hydrate. Fourier transform infrared, Raman, and X-ray photoelectron spectroscopy analyses confirmed successful surface modification of graphene using SPANI. The presence of sulfonic acid groups in SPANI accelerated the redox reaction and provided pseudocapacitance. SPANI/G-1 based electrode showed high specific capacitance of 1107Fg−1 at a current density of 1Ag−1 in a three electrode set up. An asymmetric supercapacitor (ASC) device was fabricated using SPANI/G-1 as positive electrode and chemically reduced GO (RGO) as a negative electrode. ASC showed specific capacitance of 157Fg−1 at a current density of 1.5Ag−1 and 94% retention in specific capacitance after 5000 charge-discharge cycles at a current density of 3.8Ag−1. The ASC exhibited maximum energy density of 31.4Whkg−1 and a large power density of 14,764Wkg−1. Nyquist data of the device was fitted with Z-view and different components (solution resistance, charge-transfer resistance and Warburg elements) were calculated from the fitted curve.