Solvothermal synthesis of NiAl double hydroxide microspheres on a nickel foam-graphene as an electrode material for pseudo-capacitors

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Authors

Momodu, Damilola Y.
Bello, Abdulhakeem
Dangbegnon, Julien K.
Barzegar, Farshad
Taghizadeh, Fatemeh
Fabiane, Mopeli
Johnson, Alan T. Charlie
Manyala, Ncholu I.

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American Institute of Physics

Abstract

In this paper, we demonstrate excellent pseudo-capacitance behavior of nickelaluminum double hydroxide microspheres (NiAl DHM) synthesized by a facile solvothermal technique using tertbutanol as a structure-directing agent on nickel foam-graphene (NF-G) current collector as compared to use of nickel foam current collector alone. The structure and surface morphology were studied by X-ray diffraction analysis, Raman spectroscopy and scanning and transmission electron microscopies respectively. NF-G current collector was fabricated by chemical vapor deposition followed by an ex situ coatingmethod of NiAlDHMactivematerial which forms a composite electrode. The pseudocapacitive performance of the composite electrode was investigated by cyclic voltammetry, constant charge–discharge and electrochemical impedance spectroscopy measurements. The composite electrode with the NF-G current collector exhibits an enhanced electrochemical performance due to the presence of the conductive graphene layer on the nickel foam and gives a specific capacitance of 1252 F g−1 at a current density of 1 A g−1 and a capacitive retention of about 97% after 1000 charge–discharge cycles. This shows that these composites are promising electrode materials for energy storage devices.

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Keywords

Nickelaluminum double hydroxide microspheres (NiAl DHM), Nickel foam-graphene (NF-G), Solvothermal synthesis, Pseudo-capacitors

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Citation

Momodu, D, Bello, A, Dangbegnon, J, Barzeger, F, Taghizadeh, F, Fabiane, M, Johnson, ATC & Manyala, N 2014, 'Solvothermal synthesis of NiAl double hydroxide microspheres on a nickel foam-graphene as an electrode material for pseudo-capacitors', AIP Advances, vol. 4, no. 9, pp. 097122-1-097122-14.