Supercapacitor performance of MnO2/NiCo2O4@N-MWCNT hybrid nanocomposite electrodes

• Published in: Journal of sol-gel science and technology 2019-07, Vol.91 (1), p.154-164
• Main Authors: Kathalingam, A., Ramesh, Sivalingam, Sivasamy, Arumugam, Kim, Heung-Soo, Kim, Hyun-Seok
• Format: Article
• Language: English
• Subjects: Ammonia; Capacitance; Ceramics; Chemistry and Materials Science; Composite materials; Composites; Electrochemical analysis; environment and building applications; Glass; Hybrid composites; Inorganic Chemistry; Manganese dioxide; Materials Science; Morphology; Nanocomposites; Nanotechnology; Natural Materials; Nickel compounds; Optical and Electronic Materials; Original Paper: Sol–gel and hybrid materials for energy; Properties (attributes); Supercapacitors; X ray photoelectron spectroscopy
• ISSN: 0928-0707; 1573-4846
• DOI: 10.1007/s10971-019-05032-0

MnO 2 /NiCo 2 O 4 @N-MWCNT hybrid nanocomposite was synthesized by the hydrothermal route using ammonia and urea as catalysts. The structural, morphological and compositional properties of the hybrid composites were analyzed using XRD, SEM, HR-TEM SEM-EDAX, XPS, FTIR, and Raman measurements. The electrochemical properties of the prepared hybrid composite were studied by cyclic voltammetry analysis. The outcome of the electrochemical studies revealed a specific capacitance of ~543 Fg −1 at 0.5 A g −1 current density in the KOH (6 M) electrolyte, with a stability of ~88% up to 5000 cycles. The obtained results clearly demonstrated the significance of the nanostructured MnO 2 /NiCo 2 O 4 @N-MWCNT hybrid composite in supercapacitor applications. Hydrothermal prepared well-defined nanocrystalline MnO 2 @NiCo 2 O 4 /N-doped multiwalled carbon nanotubes (N-MWCNTs) composite was successfully employed in supercapacitor application. Highlights Controlled synthesis of MnO 2 @NiCo 2 O 4 /N-MWCNT hybrid composite by hydrothermal process is reported. MnO 2 @NiCo 2 O 4 /N-MWCNT hybrid composite showed specific capacitance ~543 Fg −1 at 0.5 A.g −1 . Nanocrystalline morphology of the composite material enhanced the electrochemical properties. The hybrid composite shows the excellent capacitance retention ~88% up to 5000 cycles.