Abstract
In this paper, we demonstrate excellent pseudo-capacitance behavior of nickel-aluminum 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 coating method of NiAl DHM active material 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.
Highlights
The rapid development in the energy sector and the global economy has given rise to an urgent need for new technologies associated with the production and storage of energy
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 mechanism of the formation was explained to be due to the viscous nature and the spatial structure of the TBA solvent compared with other similar small molecule solvents
Summary
The rapid development in the energy sector and the global economy has given rise to an urgent need for new technologies associated with the production and storage of energy. The graphene/Co3O4 composite was used as a monolithic free-standing supercapacitor electrode and exhibited a high specific capacitance of ∼1100 F g−1 at a current density of 10 A g−1 with excellent cycling stability after 1000 cycles Despite these achievements, if the desire to store energy efficiently is to be met, the need to synthesize materials with higher specific capacitance, combined with an excellent rate performance and even better long-lasting stability, is still crucial. These results demonstrate that the NiAl DHMs are possible material for use in energy storage/conversion devices
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