High Performance of NiMn2O4 Nanostructured Electrode for Supercapacitor Applications

Puratchimani, M.; Venkatachalam, V.; Rajapriya, M.; Thamizharasan, K.

High Performance of NiMn2O4 Nanostructured Electrode for Supercapacitor Applications

Document Type : Original Article

Authors

M. Puratchimani ¹

V. Venkatachalam ²

M. Rajapriya ³

K. Thamizharasan ²

¹ Department of Physics, As-Salam College of Engineering and Technology, Thirumangalakudi, Aduthurai-612 012, India

² Department of Physics, Sir Theagaraya College, Chennai-600 021, India

³ Department of Chemical Engineering, SSN College of Engineering, Chennai-600 123, India

Abstract

In this present work, NiMn₂O₄ nanostructures were prepared by using KOH/NaOH double hydroxide solution by hydrothermal method. The structure and chemical composition of the prepared material was confirmed by XRD and FT-IR, respectively. HR-TEM revealed the surface morphology of the NiMn₂O₄. The enhanced electrochemical properties of the NiMn₂O₄ material were examined by the CV, CP, and EIS analyses. The supercapacitor based on the nanostructured NiMn₂O₄ revealed the higher specific capacitance (854.7 F/g at 5mV/s in 2 M aqueous KOH electrolyte), better performance and cyclic stability (94.6% capacitive retention after 1000 cycles at 4 A/g). The hexagonal morphology plays an important role in enhancing the specific capacitance of the electrode. The electrochemical behaviors infer that the hexagonal-like NiMn₂O₄ nanostructured electrode can be potentially used in supercapacitors.

Keywords

NiMn2O4

Cubic-like structure

Electrochemical properties

Double hydroxide medium