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Issue 7, 2012
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High pseudocapacitance of MnO2 nanoparticles in graphitic disordered mesoporous carbon at high scan rates

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Abstract

Nanocomposites composed of MnO2 and graphitic disordered mesoporous carbon (MnO2/C) were synthesized for high total specific capacitance and redox pseudocapacitance (CMnO2) at high scan rates up to 200 mV s−1. High resolution transmission electron microscopy (HRTEM) with energy dispersive X-ray spectroscopy (EDX) demonstrated that MnO2 nanodomains were highly dispersed throughout the mesoporous carbon structure. According to HRTEM and X-ray diffraction (XRD), the MnO2 domains are shown to be primarily amorphous and less than 5 nm in size. For these composites in aqueous 1 M Na2SO4 electrolyte, CMnO2 reached 500 F/gMnO2 at 2 mV s−1 for 8.8 wt% MnO2. A capacitance fade of only 20% over a 100-fold change in scan rate was observed for a high loading of 35 wt% MnO2 with a CMnO2 of 310 F/gMnO2 at the highest scan rate of 200 mV s−1. The high electronic conductivity of the graphitic 3D disordered mesoporous carbon support in conjunction with the thin MnO2 nanodomains facilitate rapid electron and ion transport offering the potential of improved high power density energy storage pseudocapacitors.

Graphical abstract: High pseudocapacitance of MnO2 nanoparticles in graphitic disordered mesoporous carbon at high scan rates

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Publication details

The article was received on 12 Sep 2011, accepted on 15 Nov 2011 and first published on 09 Jan 2012


Article type: Paper
DOI: 10.1039/C1JM14513D
Citation: J. Mater. Chem., 2012,22, 3160-3169
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    High pseudocapacitance of MnO2 nanoparticles in graphitic disordered mesoporous carbon at high scan rates

    M. N. Patel, X. Wang, D. A. Slanac, D. A. Ferrer, S. Dai, K. P. Johnston and K. J. Stevenson, J. Mater. Chem., 2012, 22, 3160
    DOI: 10.1039/C1JM14513D

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