Preparation and enhanced capacitive behavior of Ni-ZnO nanocomposite as electrode for supercapacitor

• Published in: Materials today : proceedings Vol. 9; pp. 361 - 370
• Main Authors: Anandhi, P., Jawahar Senthil Kumar, V., Harikrishnan, S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2019
• Subjects: cycle stability; electrode material; Ni-ZnO; specific capacitance; specific capacitance; cycle stability; electrode material; Ni-ZnO
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2019.02.165

The objective of the present work is to evaluate the enhanced capacitive behavior of newly prepared Ni-ZnO nanocomposites as electrode materials for supercapacitor applications. Ni-ZnO nanocomposites have been prepared via sol-gel method. Morphology and structural properties of Ni-ZnO particles have been studied with the help of field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD), respectively. The electrochemical properties of the Ni-ZnO based electrode have been determined by cyclic voltammetry (CV) and galvanostatic charge-discharge tests. Test results obtained from CV test show that maximum specific capacitance for Ni-ZnO based electrodes has been evaluated as 392 F g-1 at the scan rate of 5 mV s-1 in 1M Na2SO4 electrolyte. The cycle stability of the Ni-ZnO based electrodes has been probed by using cyclic voltammetry and galvanostatic charge-discharge measurements. The cycle stability test reveals that after 5000 charge-discharge cycles, Ni-ZnO based electrode has lost only 18% capacitance value of that of the initial value. Hence, the as synthesized Ni-ZnO nanocomposites could be reckoned to be a potential candidate for electrode material of supercapacitor.