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Issue 29, 2012
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Electrochemical characterization of single-layer MnO2 nanosheets as a high-capacitance pseudocapacitor electrode

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Abstract

A MnO2/carbon composite comprised of single layer MnO2 nanosheets and acetylene black (AB) was assembled by simply mixing a MnO2 nanosheet colloidal suspension and AB suspension. MnO2 nanosheets were synthesized by a one-pot procedure and adsorbed onto AB aggregates as a single layer (monosheets) through electrostatic interactions. The one-pot synthesis ensures no unexfoliated material, unlike previous preparations. Galvanostatic charge–discharge measurements and cyclic voltammetry in organic electrolytes demonstrate that the MnO2/AB composite exhibits an excellent specific capacity and capacitance of 400 mA h g−1 and 739 F g−1, respectively, at a scan rate of 1 mV s−1. The obtained specific capacity considerably exceeds the theoretical capacity; this can be explained by the extremely high fraction of single layer sheets from the one-pot procedure.

Graphical abstract: Electrochemical characterization of single-layer MnO2 nanosheets as a high-capacitance pseudocapacitor electrode

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Publication details

The article was received on 21 Feb 2012, accepted on 01 Jun 2012 and first published on 22 Jun 2012


Article type: Paper
DOI: 10.1039/C2JM31080E
Citation: J. Mater. Chem., 2012,22, 14691-14695
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    Electrochemical characterization of single-layer MnO2 nanosheets as a high-capacitance pseudocapacitor electrode

    K. Kai, Y. Kobayashi, Y. Yamada, K. Miyazaki, T. Abe, Y. Uchimoto and H. Kageyama, J. Mater. Chem., 2012, 22, 14691
    DOI: 10.1039/C2JM31080E

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