Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6609530 | Electrochimica Acta | 2016 | 48 Pages |
Abstract
NiCo2O4/NiO nanocomposite is successfully synthesized by rapid microwave assisted reflux method at various reaction times. XRD analysis is performed to reveal the crystalline nature and the compound formation. Further, the chemical environment of the surface composition of NiCo2O4/NiO is identified by X-ray Photoelectron spectroscopy. The morphological analysis (FESEM and TEM) of the composite showed that the formation of bundle like irregular large aggregates, which consists of nearly spherical particles. The maximum specific capacitance of 1924 F gâ1 at 1 mV sâ1 in 1 M KOH electrolyte with an excellent energy density of 75 Wh Kgâ1 at a power density of 103 W kgâ1 is revealed for the NiCo2O4/NiO electrode. An asymmetric supercapacitor (ASC) is constructed using optimized NiCo2O4/NiO as positive and synthesized Fe2O3 as negative electrodes. This novel NiCo2O4/NiOÇFe2O3 architecture provides superior capacitive performance with a specific capacitance of 417 F gâ1 at 1 mV sâ1. Subsequently the charge-discharge analysis exhibits the specific capacitance of 79 F gâ1 at 1 mA cmâ2. The fabricated asymmetric supercapacitor (ASC) delivers an energy density of 19 Wh kgâ1 at 157 W kgâ1. Moreover, it provides an excellent cycle stability of about 97% capacitance retention over 5000 cycles.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
A. Shanmugavani, R. Kalai Selvan,