MnO2-Embedded-in-Mesoporous-Carbon-Wall Structure for Use as Electrochemical Capacitors
- 1 March 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 110 (12), 6015-6019
- https://doi.org/10.1021/jp056754n
Abstract
We present an in situ reduction method to synthesize a novel structured MnO2/mesoporous carbon (MnC) composite. MnO2 nanoparticles have been synthesized and embedded into the mesoporous carbon wall of CMK-3 materials by the redox reaction between permanganate ions and carbons. Thermogravimetric analysis (TG), X-ray photoelectron spectrum (XPS), X-ray diffraction (XRD), nitrogen sorption, transmission electron microscopy (TEM), and cyclic voltammetry were employed to characterize these composite materials. The results show that different MnO2 contents could be introduced into the pores of CMK-3 treated with different concentrations of potassium permanganate aqueous solution, while retaining the ordered mesostructure and larger surface area. Increasing the MnO2 content did not result in a decrease in pore size from the data of nitrogen sorption isotherms, indicating that MnO2 nanoparticles are embedded in the pore wall, as evidenced by TEM observation. We obtained a large specific capacitance over 200 F/g for the MnC composite and 600 F/g for the MnO2, and these materials have high electrochemical stability and high reversibility.Keywords
This publication has 16 references indexed in Scilit:
- Cap Closing of Thin Carbon NanotubesAdvanced Materials, 2005
- Performance of Manganese Oxide/CNTs Composites as Electrode Materials for Electrochemical CapacitorsJournal of the Electrochemical Society, 2005
- Potentiodynamically deposited nanostructured manganese dioxide as electrode material for electrochemical redox supercapacitorsJournal of Power Sources, 2004
- Size‐Dependent Periodically Twinned ZnSe NanowiresAdvanced Materials, 2004
- Formation of Europium Chelate Complexes by Vacuum Co‐Deposition and Their Application in Organic Light‐Emitting DiodesAdvanced Materials, 2004
- Control of mesoporous structure of carbons synthesised using a mesostructured silica as templateMicroporous and Mesoporous Materials, 2003
- New trends in electrochemical supercapacitorsJournal of Power Sources, 2001
- Electrodeposition of Nickel‐Aluminum Alloys from the Aluminum Chloride‐1‐methyl‐3‐ethylimidazolium Chloride Room Temperature Molten SaltJournal of the Electrochemical Society, 1996
- Synthetic Diamond Electrodes: Photoelectrochemical Investigation of Undoped and Boron‐Doped Polycrystalline Thin FilmsJournal of the Electrochemical Society, 1995
- The Effect of the Hydrostatic Pressure on the Ionic Conductivity in a Perovskite Lanthanum Lithium TitanateJournal of the Electrochemical Society, 1995