Interconnected plate-like NiCo2O4 microstructures for supercapacitor application

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Vol. 287; p. 116072
• Main Authors: Yewale, M.A., Kadam, R.A., Kaushik, N.K., Koduru, J.R., Velhal, N.B., Nakate, Umesh T., Jadhavar, A.A., Sali, N.D., Shin, D.K.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.01.2023; Elsevier BV
• Subjects: Capacitance; Chemical synthesis; Crystallites; Electrode materials; Electrodes; Energy storage; Hydrothermal; Microstructure; Morphology; Nanomaterials; Nanostructured materials; Nickel compounds; NiCo2O4; Plates-like morphology; Porous materials; Specific capacitance; Supercapacitor; Supercapacitors; TEM; X-ray diffraction; Supercapacitor; Specific capacitance; Hydrothermal; TEM; NiCo2O4; Plates-like morphology
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2022.116072

Quantitative current distribution and possible mechanism for formation of 3D-Interconnected plate like microstructure of NiCo2O4 by hydrothermal process. [Display omitted] •A hydrothermal method has been used to synthesis interconnected plates like microstructure of NiCo2O4 as electrode materials.•NiCo2O4 electrode materials show the highest specific capacitance of 550 F/g and power density 789 W/kg.•The Asymmetric supercapacitor has energy density of 3.81 Wh/kg at power density of 789W/kg. The precise synthesis of interconnected and porous microstructured electrode materials for supercapacitor application is always challenging to obtain maximum surface area for electrode–electrolyte interaction. Herein, the interconnected microstructured morphology of NiCo2O4 is synthesized via an inexpensive chemical route viz hydrothermal method. Synthesized NiCo2O4 nanomaterial is characterized for structural, morphological, electrochemical characteristics by XRD, SEM, CV, GCD, and EIS measurements. The XRD pattern reveals that nanostructured material is polycrystalline with a cubic phase. The average crystallite size of NiCo2O4 is 10.85 nm. The SEM analysis confirms interconnected plates microstructures with surface aea of 34 m2g−1. The NiCo2O4 electrodes are fabricated and their specific capacitance was measured using CV and GCD data. The maximum specific capacitance of the NiCo2O4 electrode is 550 F/g. Furthermore, an as-fabricated asymmetric supercapacitor (ASC) has an energy density of 3.81 Wh/kg, a power density of 789 W/kg at 4 mAcm−2, and capacitance retention of 87% after 2,000 cycle. An interconnected plate-like microstructure of NiCo2O4 material is a potential candidate for energy storage application.