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Graphene/ β‐ MnO 2 composites—synthesis and its electroanalytical properties study in the Mg storage battery
Author(s) -
Venkateswarlu Gundu,
Madhu Devarapaga,
Vatsala Rani Jetti
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5644
Subject(s) - graphene , materials science , cyclic voltammetry , dielectric spectroscopy , composite number , calcination , battery (electricity) , x ray photoelectron spectroscopy , electrochemistry , chemical engineering , magnesium , composite material , nanotechnology , electrode , metallurgy , catalysis , chemistry , organic chemistry , quantum mechanics , engineering , power (physics) , physics
Summary Graphene/ β ‐MnO 2 composites were synthesized via ultrasonication method, followed by calcination at 400°C for 4 hours. The structural properties of synthesized graphene and graphene/ β‐ MnO 2 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‐ MnO 2 ‐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‐ MnO 2 ‐20% composite materials as cathode for magnesium storage system due to the synergetic interaction between a pure β‐ MnO 2 particle and graphene sheet.