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Issue 2, 2010
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Hybrid MnO2–disordered mesoporous carbon nanocomposites: synthesis and characterization as electrochemical pseudocapacitor electrodes

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Abstract

MnO2–mesoporous carbon hybrid nanocomposites were synthesized to achieve high values of redox pseudocapacitance at scan rates of 100 mV s−1. High-resolution transmission electron microscopy (HRTEM) along with energy dispersive X-ray spectroscopy (EDX) demonstrated that ∼1 nm thick MnO2 nanodomains, resembling a conformal coating, were uniformly distributed throughout the mesoporous carbon structure. HRTEM and X-ray diffraction (XRD) showed formation of MnO2 nanocrystals with lattice planes corresponding to birnessite. The electrochemical redox pseudocapacitance of these composite materials in aqueous 1 M Na2SO4 electrolyte containing as little as 2 wt% MnO2 exhibited a high gravimetric MnO2 pseudocapacitance (CMnO2) of 560 F gMnO2−1. Even for 30 wt% MnO2, a high CMnO2 of 137 F gMnO2−1 was observed at 100 mV s−1. Sodium ion diffusion coefficients on the order of 10−9 to 10−10 cm2 s−1 were measured using chronoamperometry. The controlled growth and conformal coating of redox-active MnO2–mesoporous carbon composites offer the potential for achieving high power energy storage with low cost materials.

Graphical abstract: Hybrid MnO2–disordered mesoporous carbon nanocomposites: synthesis and characterization as electrochemical pseudocapacitor electrodes

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Publication details

The article was received on 31 Jul 2009, accepted on 08 Oct 2009 and first published on 11 Nov 2009


Article type: Paper
DOI: 10.1039/B915370E
Citation: J. Mater. Chem., 2010,20, 390-398
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    Hybrid MnO2–disordered mesoporous carbon nanocomposites: synthesis and characterization as electrochemical pseudocapacitor electrodes

    M. N. Patel, X. Wang, B. Wilson, D. A. Ferrer, S. Dai, K. J. Stevenson and K. P. Johnston, J. Mater. Chem., 2010, 20, 390
    DOI: 10.1039/B915370E

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