Preparation and Characterization of Nanostructured Manganese Oxide for Supercapacitors

Abstract

Nanostructured manganese oxides were synthesized by a sol-gel method using manganese acetate (MnAc2) and citric acid (C6H8O7,) as precursors, and characterized by Brunauer-Emmett-Teller (BET) analysis, Barrett-Joyner-Halenda (BJH), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The nano-rod structure of MnO2 developed gradually when the calcination temperature varied from 380 to 580 degrees C. As the pH increased, the pore size increased, while the specific surface area decreased. The effects of the pH and calcination temperature on the electrochemical properties of the nano-MnO2 electrode, including the supercapacitive behavior, were investigated by cyclic voltammetry (CV) tests. The tests were performed between 0 and 0.8 V versus Ag/AgCl in 1 M Na2SO4 electrolyte at various scan rates (10-200 mVs(-1)). The specific capacitance of the SP-380 sample, prepared at pH 6, was equal to 269.3 Fg(-1). After 300 cycles, approximately a 3.4% increase of the specific capacitance was measured, confirming the excellent cyclability.

Dispersed MnO2 nanoparticles/sugarcane bagasse-derived carbon composite as an anode material for lithium-ion batteries

“…20 Pure MnO 2 synthesized from the hydrothermal reaction had XRD diffraction peaks at 2q of 12.8, 18.1, 28.9, 37.5, 42, 49.9, 60.3 and 65.4°, representing the (110), ( 200), (310), ( 211), (301), ( 411), ( 600) and (002) planes of hollanditetype a-MnO 2 , respectively (JCPDS 44-0141). [21][22][23] Compared to BGC and NBGC, the MnO 2 /NBGC composite products at all MnO 2 loading concentrations showed common XRD peaks at 2q of approximately 38°and 67°, consistent with the main characteristic crystalline planes of a-MnO 2 . All the diffraction peaks obtained from the deposited MnO 2 nanoparticles were quite weak and broad, denoting their nanocrystalline nature.…”

Manganese Oxide Nanoparticles: An Insight into Structure, Synthesis and Applications

“…Perazolli et al [83] synthesized TiO 2 /CuO films by citrate technique to study their photocatalytic properties. Jang et al [84] synthesized manganese oxide nanostructures using citric acid with manganese acetate as precursors and investigated their electrochemical properties. They obtained a specific capacitance of 269.3 Fg -1 and showed admirable cyclability.…”

“…In the present scenario, the materials with promising properties for high power electrochemical energy storage are in high Cocoon-like and nanorod-like morphology Homogeneity, enhanced cyclability [84] demand for applications varying from electric vehicles to smart grids. Electrochemical capacitors provide a very significant response for these applications, owing to the energy and power densities in between that of dielectric capacitors and batteries.…”