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Issue 6, 2018
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γ-FeOOH and amorphous Ni–Mn hydroxide on carbon nanofoam paper electrodes for hybrid supercapacitors

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Abstract

This work reports the preparation of γ-FeOOH and amorphous Ni–Mn hydroxide on carbon nanofoam paper (CNFP) by galvanostatic electrodeposition for application in hybrid FeOOH-CNFP∥Ni–Mn hydroxide-CNFP supercapacitors working in alkaline electrolytes. The γ-FeOOH on CNFP displayed a porous morphology composed of fluffy nanoflakes. It showed an enhanced redox response in the negative working potential range of −1.5–0 V vs. SCE with a storage capacity of 3.48 C cm−2 at 10 mA cm−2 and a response rate of 71% when the current densities increased from 10 mA cm−2 to 50 mA cm−2. The amorphous Ni–Mn hydroxide on CNFP displayed a porous morphology composed of fine nanoflakes. It showed an enhanced redox response in the positive working potential range of 0–0.5 V vs. SCE with a storage capacity of 1.54 C cm−2 at 10 mA cm−2 and a response rate of 73% when the current densities increased from 10 mA cm−2 to 50 mA cm−2. The hybrid FeOOH-CNFP∥Ni–Mn hydroxide-CNFP supercapacitor delivered a high energy density of 1515 mW h cm−2, at a power density of 9 mW cm−2 at a working voltage of 1.8 V and a long cycle life with a capacity retention of 95% after 10 000 charge–discharge cycles. Self-discharge studies revealed the main contribution of the FeOOH-CNFP electrode to the voltage drop of the supercapacitor cell. Activation-controlled processes governed the self-discharge of the FeOOH-CNFP electrode, while mixed activation-controlled and diffusion-controlled processes governed the self-discharge of the Ni–Mn hydroxide-CNFP electrode.

Graphical abstract: γ-FeOOH and amorphous Ni–Mn hydroxide on carbon nanofoam paper electrodes for hybrid supercapacitors

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Publication details

The article was received on 27 Jun 2017, accepted on 08 Jan 2018 and first published on 22 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA05582J
Citation: J. Mater. Chem. A, 2018,6, 2612-2624
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    γ-FeOOH and amorphous Ni–Mn hydroxide on carbon nanofoam paper electrodes for hybrid supercapacitors

    T. Nguyen and M. Fátima Montemor, J. Mater. Chem. A, 2018, 6, 2612
    DOI: 10.1039/C7TA05582J

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