Volume 44, Issue 13 pp. 10238-10250
RESEARCH ARTICLE

Graphene/β-MnO2 composites—synthesis and its electroanalytical properties study in the Mg storage battery

Gundu Venkateswarlu

Gundu Venkateswarlu

Polymers and Functional Materials Division, Indian Institute of Chemical Technology, Hyderabad, India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India

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Devarapaga Madhu

Devarapaga Madhu

Centre for Lipid Science and Technology Division, Indian Institute of Chemical Technology, Hyderabad, India

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Jetti Vatsala Rani

Corresponding Author

Jetti Vatsala Rani

Polymers and Functional Materials Division, Indian Institute of Chemical Technology, Hyderabad, India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India

Correspondence

Jetti Vatsala Rani, Principal Scientist, Polymer & Functional Materials Division, Indian Institute of Chemical Technology, Hyderabad 500007, Telangana, India.

Email: [email protected]

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First published: 12 July 2020
Citations: 8

Funding information: DST/TMD/MESSP/2017/07; CSIR – IICT, Grant/Award Number: Communication number. IICT/Pubs./2019/136; UGC, New Delhi-India

Summary

Graphene/β-MnO2 composites were synthesized via ultrasonication method, followed by calcination at 400°C for 4 hours. The structural properties of synthesized graphene and graphene/β-MnO2 composites were systematically studied using different instruments, such as XRD, FESEM, TEM, EDX, XPS and FT-IR spectroscopy. Furthermore, magnesium storage performance was scientifically studied using various electroanalytical characterizations like galvanostatic charge/discharge, electrochemical impedance spectra and cyclic voltammetry. The GNS/β-MnO2-20% composite displays the discharge capacity of 110 mAh/g within 60 cycles at a current density of 25 mA/g, which is an excellent rate capability, and magnesium storage performance around 100 cycles. There is a significant improvement in electrochemical properties of GNS/β-MnO2-20% composite materials as cathode for magnesium storage system due to the synergetic interaction between a pure β-MnO2 particle and graphene sheet.

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