期刊
CHEMICAL PHYSICS LETTERS
卷 755, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.cplett.2020.137809
关键词
NiCo2O4; Nanoflakes; High surface area; Supercapacitor; Energy storage and conversion
资金
- Department of Science and Technology - Science and Engineering Research Board, New Delhi, India (DST-SERB-EMR) [EMR/2016/007280]
- Chikkaiah Naicker College (Affiliated to Bharathiar University), Erode, Tamilnadu, India
A facile, robust and low cost hydrothermal method has been used to fabricate spinel-type NiCo2O4 nanosheets (NCNs) and nanoflakes (NCFs) using NaOH and oxalic acid as a precipitate agents. The structural, morphological and porosity properties of the electrodes were examined by X-ray diffraction (XRD), Raman, Field emission scanning electron microscope (FESEM), N-2 adsorption-desorption and X-ray photoelectron spectra (XPS) analysis. The NiCo2O4 nanoflakes electrode exhibit outstanding electrochemical actions with a specific capacitance reaching 1366 Fg(-1) at 2 Ag-1, as well as high capacitance retention (86.7%) after 5000 cycles at 20 Ag-1. Besides, the asymmetric supercapacitor (ASC) was made-up using NiCo2O4 nanoflakes and activated carbon (AC) as the positive and negative, respectively. The ASC device distribute an ultrahigh energy density of 42.1 Whkg(-1) at the power density of 1193 Wkg(-1), representing its admirable application potential as an electrode material for supercapacitors.
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