α-Manganese Dioxide (α-MnO2) Coated with Polyaniline (PANI) and Reduced Graphene Oxide (rGO)-Based Nanocomposite for Supercapacitor Application

Abstract

This work reports the preparation and testing of a composite material composed of α-Manganese dioxide (α-MnO2) coated with polyaniline (PANI) and reduced graphene oxide (rGO) for supercapacitor application. The structure and morphology of the materials were characterized by using X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Raman spectroscopy. The electrochemical performances of the materials were investigated by using cyclic voltammetry (CV), Galvanostatic charge–discharge (GCD), cyclic stability and electrochemical impedance spectroscopy (EIS). The α-MnO2-coated PANI/rGO nanocomposite exhibited a specific capacitance of 261 F g−1 at the scan rate of 5 mV s−1 with 75% capacitance retention after 2000 cycles at 5 A g−1. It showed a specific energy of 11 W h kg−1 and specific power of 1250 W kg−1.

Investigation of Hybrid Electrodes of Polyaniline and Reduced Graphene Oxide with Bio-Waste-Derived Activated Carbon for Supercapacitor Applications

“…Also, the specific capacitance retention was found to be 90.07% and 71.02% for 3000 consecutive cycles at 0.5 A•g −1 for the PAni@OS−rGO (1:1) and PAni@OS−rGO (2:1) electrodes, respectively (Figure 9d). The electrodes in this research are comparable to those in other previous reports [7,13,[40][41][42][43][44][45][46][47][48][49]; these results suggest the superiority of PAni@OS−rGO materials over those of other rGObased electrodes (see Table 1). The specific capacitance values of the two electrodes gradually increase from 0.1 A•g −1 to 7.0 A•g −1 (Figure 10a), exhibiting good rate performance, which is assigned to their unique interbonded structures and rationalistic hierarchal porous structures.…”

Enhancing supercapacitive performance: integration of bio-mass-derived carbon into a CaMn3O6 nanocomposite

“…14 A combination of rGO and conductive polymer PANI is used along with MnO 2 as reported by Patil et al . 15 A MnO 2 nanocomposite with bamboo shoot-derived rGO was reported by Ruti et al . 16 A ternary nanocomposite with rGO and multiwalled carbon tubes was reported by Nakhodchari et al .…”

Challenges and Opportunities: Conducting Polymer‐Graphene based Nanocomposites of Metal Oxides and Metal Sulfides for Supercapacitors

“…In short, the study provides practical insights into the development and improvement of highly reliable electrode materials. [91] The ternary composite (CoFe 2 O 4 -rGO-Ppy) is synthesized to enhance the energy density of supercapacitor electrodes. Urea is used to synthesize a binary material based on CoFe 2 O 4 (cobalt-iron oxide) and rGO in a single step.…”