Issue 6, 2018

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

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

Supplementary files

Article information

Article type
Paper
Submitted
27 Jun 2017
Accepted
08 Jan 2018
First published
22 Jan 2018

J. Mater. Chem. A, 2018,6, 2612-2624

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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