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Electrochemical investigation of Zr-doped ZnO nanostructured electrode material for high-performance supercapacitor

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Abstract

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.

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Acknowledgments

The authors thank the management of Bishop Heber College (Autonomous), Tiruchirappalli – 620017, Tamil Nadu, India, for the support and facilities provided through Material Chemistry Lab, PG and Research Department of Chemistry and DST-FIST Instrumentation Centre (HAIF) at Bishop Heber College.

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  1. PG & Research Department of Physics, Bishop Heber College (Autonomous), Affiliated to Bharathidasan University, Tiruchirappalli, Tamil Nadu, 620 017, India

    M. Dhivya Angelin

  2. PG & Research Department of Physics, National College (Autonomous), Affiliated to Bharathidasan University, Tiruchirappalli, Tamil Nadu, 620 001, India

    M. Dhivya Angelin, A. Robert Xavier & A. T. Ravichandran

  3. PG & Research Department of Chemistry, Bishop Heber College (Autonomous), Affiliated to Bharathidasan University, Tiruchirappalli, Tamil Nadu, 620 017, India

    S. Rajkumar & J. Princy Merlin

  4. Department of Mechanical Engineering, Alagappa Chettiar Government College of Engineering & Technology, Karaikudi, Tamil Nadu, 630 003, India

    M. Franklin

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Angelin, M.D., Rajkumar, S., Merlin, J.P. et al. Electrochemical investigation of Zr-doped ZnO nanostructured electrode material for high-performance supercapacitor. Ionics 26, 5757–5772 (2020). https://doi.org/10.1007/s11581-020-03681-8

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