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NiGa-LDH@NiWO4 nanocomposite as an electrode material for pseudocapacitors

Abstract

The NiGa-LDH@X-NiWO4 (X: 3, 5 or 10 wt.% NiWO4) nanocomposites were prepared at room temperature under mild conditions. The synthesized nanocomposites were characterized with Powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR) and field emission scanning electron microscopy (FESEM) techniques. Electrochemical tests of nanocomposites were considered by using cyclic voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) techniques. Application of the nanocomposites in three-electrode cell unraveled that the specific capacitance of NiGa-LDH@10-NiWO4 nanocomposite, i.e. 275 F g-1 at the 1 A g-1 current density in pseudocapacitors, is greater than that of the NiGa-LDH@3-NiWO4 and NiGa-LDH@5-NiWO4 nanocomposites and their pure NiGa-LDH and NiWO4 components. Moreover, NiGa-LDH@10-NiWO4 nanocomposite exhibited a low resistance against ion diffusion and an outstanding capacitive behavior by retainining about 92% of its initial capacitive after performing 1000 cycles at 2 A g-1 current density. The improvement observed in the performance of the fabricated pseudocapacitor can be attributed to the synergistic effect of the NiWO4 and NiGa-LDH materials. Evaluation of the the effect of electrolyte alkalinity and the presence of different cations indicated that highly alkaline electrolytes promote the electrochemical behaviour of nanocomposite coated electrodes. The application of the NiGa-LDH@10-NiWO4 electrode, along with an activated carbon electrode, to fabrication of an asymmetric cell leads to the provision of an excellent cycle life, 7.11 Wh kg-1 energy density and 12800 W kg-1 power density. Therefore, NiGa-LDH@10-NiWO4 can be considered as a new electrode material in fabrication of the portable electronics and electric vehicles that rely on high-performance asymmetric supercapacitors.

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Publication details

The article was received on 29 Aug 2018, accepted on 29 Sep 2018 and first published on 01 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ04402C
Citation: New J. Chem., 2018, Accepted Manuscript
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    NiGa-LDH@NiWO4 nanocomposite as an electrode material for pseudocapacitors

    S. Sanati, Z. Rezvani and B. Hbibi, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ04402C

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