| Autor: |
Angelin, M. Dhivya, Rajkumar, S., Merlin, J. Princy, Xavier, A. Robert, Franklin, M., Ravichandran, A. T. |
| Zdroj: |
Ionics; Nov2020, Vol. 26 Issue 11, p5757-5772, 16p |
| Abstrakt: |
Simple electrochemical capacitors are promising energy storage devices because of their power capability, charge/discharge rates and life cycle. Zinc oxide is an inexpensive and eco-friendly material which can be used as a supercapacitor electrode relative to other materials with great features. With a view to enhance the electrochemical performance of ZnO (Csp of 324), the present work is focused to synthesize modified ZnO nanostructures by the dopant Zr in three different compositions (3, 6 and 9 wt% Zr-doped ZnO) via chemical coprecipitation method. The synthesized materials were characterized by physio-chemical methods. The significant capacitive behaviour of ZnO and modified ZnO and 9 wt%Zr-doped ZnO nanostructure were investigated by cyclic voltammetric (CV) studies, galvanostatic charge-discharge (GCD) analysis and electrochemical impedance spectroscopic (EIS) methods in aqueous 1 M KOH. The newly fabricated 9 wt% Zr-doped ZnO electrode exhibited excellent specific capacitance of 518 Fg−1 at a current density of 1 Ag−1. Additionally, it depicted the capacitance retention of 94% even after 5000 successive GCD cycles. Moreover, the as-prepared materials demonstrated electrochemical reversible nature. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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