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Issue 20, 2015
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Morphological changes and electrochemical response of mixed nickel manganese oxides as charge storage electrodes

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Abstract

Nickel manganese (Ni–Mn) oxide films were prepared by potentiostatic electrodeposition over stainless steel and post-thermal annealing at 250 °C. Morphological and structural changes were observed depending on the Ni to Mn ratio in the electrolyte. Single-phase Ni1−xMnxO oxide was formed at low Mn content, whereas two phases composed of Ni1−xMnxO and NixMn3−xO4 were formed at high Mn content. Electrochemical studies revealed an increase of the specific capacitance of the mixed Ni–Mn oxide electrodes compared to the single metal oxides, thus pin-pointing a synergistic effect. The Ni–Mn oxide film displayed a specific capacitance of about 300 F g−1 in a potential window of 0.5 V at an applied current density of 1 A g−1. The rate capability of the oxides was 58% when the applied current was increased from 1 A g−1 to 10 A g−1. The Ni–Mn oxide film exhibits excellent cycling stability with 100% capacitance retention after 1500 cycles.

Graphical abstract: Morphological changes and electrochemical response of mixed nickel manganese oxides as charge storage electrodes

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Publication details

The article was received on 24 Feb 2015, accepted on 02 Apr 2015 and first published on 27 Apr 2015


Article type: Paper
DOI: 10.1039/C5TA01453K
Citation: J. Mater. Chem. A, 2015,3, 10875-10882
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    Morphological changes and electrochemical response of mixed nickel manganese oxides as charge storage electrodes

    T. Nguyen, M. Boudard, L. Rapenne, M. J. Carmezim and M. F. Montemor, J. Mater. Chem. A, 2015, 3, 10875
    DOI: 10.1039/C5TA01453K

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