High Specific Capacitance of Polyaniline/Mesoporous Manganese Dioxide Composite Using KI-H2SO4 Electrolyte

Abstract

Abstract:The PANI/Mesoporous MnO 2 composites were prepared through a simple one step method and we introduced the KI-H 2 SO 4 solution as the electrolyte of PANI/MnO 2 composites creatively. The characterization of structure, morphology, and composition are obtained by X-ray diffraction, Fourier transform infrared spectroscopy, thermal gravity analysis, Raman spectra, and scanning electron microscope. The electrochemical performances were investigated by constant-current charge-discharge, the voltammetry curve, and alternating current (AC) impedance technique. The specific capacitance of composites is 1405 F/g, which is almost 10 times larger than MnO 2 (158 F/g). We also find that the iodide concentration is closely related to the specific capacitance. Therefore, we explored the specific capacitance at different iodide concentration (0.05, 0.1, 0.2, 0.5, and 1 M), the results indicated that the specific capacitance reached a maximum value (1580 F/g) at 0.5 mol/L. Additionally, the PANI/Mesoporous MnO 2 composites not only exhibited a good ratio discharge property (857 F/g) at high current density, but also revealed an excellent cycling stability after 500 cycles, which retained 90% of the original specific capacitance.

Oil tea shell derived porous carbon with an extremely large specific surface area and modification with MnO2 for high-performance supercapacitor electrodes

“…The specific capacitance of the MnO 2 /AC composition is much higher than that of the pristine activated carbon (146 F/g @0.5A/g), and it is still slightly lower than a recent literature value (1405 F/g) on a polyaniline/mesoporous manganese dioxide composite. 47 The cycle stability (tested at 1A/g) shown in Figure 5a and its inset (normalized cycle stability), after 3000 cycles, AC and MnO 2 /AC remained 86% and 97% of the initial capacitances separately. Due to the low ion diffusion resistances, MnO 2 /AC showed a better cycle stability than AC.…”

Electrochemical synthesis of polyaniline in the micropores of activated carbon for high-performance electrochemical capacitors

“…The post-polymerization AC/ANI samples did not exhibit the characteristic peaks of bulk PANI at 14.4°, 19.6°, and 25.4°. 1 Instead, a broad peak at around 20-25° was observed, and the peak intensity increased with the amount of ANI in the sample.…”

Synthesis of Polyaniline coated Graphene Oxide @ SrTiO3 Nanocube Nanocomposites for Enhanced Removal of Carcinogenic Dyes from Aqueous Solution

“…Unique electrical and optoelectronic properties due to extended πconjugated electron systems make conductive polymers extensively explored materials. Conducting polymers such as polythiophene, polyacetylene, polypyrrole, polyphenylene, and polyaniline have been widely studied in multidisciplinary research areas comprising environmental, electronics, electromagnetic, thermoelectric, sensors, batteries, electro-luminescence, and electromechanical applications [23][24][25][26][27][28]. Among the conducting polymer family, polyaniline (PANI), owing to its unique electrochemical properties, higher environmental stability, easy synthetic methodologies, costeffectiveness, efficient thermal stability, and wide varieties of application, has been most intensively investigated by the scientific community [29].…”