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Issue 14, 2015
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Investigations into the origin of pseudocapacitive behavior of Mn3O4 electrodes using in operando Raman spectroscopy

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Abstract

A detailed understanding of the phase changes of manganese oxides in a pseudocapacitor during cycling is vital to reveal the mechanism by which they store energy and to achieve a rational design of improved electrode materials. Here we report the results of our probing the phase changes of a Mn3O4 electrode material in a pseudocapacitor during a charging/discharging process using in operando Raman spectroscopy. Along with enhancing performance, the spinel Mn3O4 was transformed to a layered birnessite-type MnO2 upon potential cycling and two types of processes were shown to contribute to the energy storage: intercalation/deintercalation of Na+ and oxidation/reduction of Mn2+. After charging and discharging for ∼10 000 cycles, the specific capacitance of manganese oxide increased almost 3-fold; and the maximum specific capacitance approached 230 F g−1 at a cycling rate of 0.5 A g−1.

Graphical abstract: Investigations into the origin of pseudocapacitive behavior of Mn3O4 electrodes using in operando Raman spectroscopy

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Publication details

The article was received on 11 Jan 2015, accepted on 17 Feb 2015 and first published on 18 Feb 2015


Article type: Paper
DOI: 10.1039/C5TA00223K
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Citation: J. Mater. Chem. A, 2015,3, 7338-7344
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    Investigations into the origin of pseudocapacitive behavior of Mn3O4 electrodes using in operando Raman spectroscopy

    L. Yang, S. Cheng, X. Ji, Y. Jiang, J. Zhou and M. Liu, J. Mater. Chem. A, 2015, 3, 7338
    DOI: 10.1039/C5TA00223K

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