Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 821, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.153503
Keywords
NiCo2O4; 3D nanowires; Porous structure; Asymmetric supercapacitor device; Energy storage
Categories
Funding
- University Grants Commission (UGC) India
- Department of Science and Technology (DST)
- CSIR, Govt. of India
- Department of Science and Technology (DST), Government of India
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In the present work, hydrothermal and wet chemical methods are adopted to fabricate NiCo2O4 nanowires (NiCo-NW) and NiCo2O4 nanoparticles (NiCo-NP) respectively. Owing to the mesoporous nature of these subunits, fast and convenient electron-ion transport and redox reaction, NiCo-NW achieves excellent electrochemical performance. Structure and microstructural characterizations of these samples are carried out by analyzing X-ray diffraction data employing the Rietveld method of structure refinement method and analyzing HRTEM, FESEM images and FTIR spectra. The low dimensional NiCo-NP is found to provide superior electrochemical performance than the NiCo-NW (similar to 13 nm) due to its smaller particle size (similar to 9 nm). This porous structure effectively helps in better transport of ions in the electrolyte. It manifests high specific capacitance 1066.03 F g(-1) and enormous areal capacitance up to 5.96 F cm(-2) whereas NiCo-NW exhibits specific capacitance up to 880.72 F g(-1) and high areal capacitance of 4.93 F cm(-2). An asymmetric supercapacitor (ASC) has been fabricated with NiCo-NP and activated carbon as positive and negative electrodes respectively in 1 M Na2SO4 electrolyte medium. This device offers maximum specific energy 59.56 Wh Kg(-1) and maximum power density 3403 W kg(-1) with a high energy density of 4.197 Wh Kg(-1) and shows excellent cyclic stability. (C) 2019 Elsevier B.V. All rights reserved.
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