Abstract
Mesoporous MnO 2 has been synthesized by means of a novel, facile, and template-free method by virtue of a soft interface between CCl 4 and H 2O without any surfactants or organometallic precursors or ligands. X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy analysis, scanning electron microscopy, and an ASAP2010 autoadsorption analyzer were applied to investigate the composition and microstructure of the as-synthesized MnO 2. The structure characterizations indicated a good mesoporous structure for as-prepared MnO 2 with an adsorption average pore diameter of 9.7 nm, mesoporous volume of 0.58 cm 3 g −1, and Brunauer–Emmett–Teller specific surface area of 239 m 2 g −1. Electrochemical properties of the mesoporous MnO 2 were elucidated by cyclic voltammograms, galvanostatic charge–discharge, and electrochemical impedance spectroscopy in 1 M Na 2SO 4 electrolyte. Electrochemical data analysis demonstrated that as-synthesized MnO 2 had good capacitive behavior due to its unique mesoporous structure. A specific capacitance of ca. 220 F g −1 could still be delivered for the mesoporous MnO 2 even at a scan rate of 100 mV s −1.
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