Critical Influence of Reduced Graphene Oxide Mediated Binding of M (M = Mg, Mn) with Co ions, Chemical Stability and Charge Storability Enhancements of Spinal-Type Hierarchical MCo2O4 Nanostructures

Krishnan, Syam G. and Harilal, Midhun and Yar, Asfand and Vijayan, Bincy Lathakumary and Dennis, John Ojur and M. M., Yusoff and Rajan, Jose (2017) Critical Influence of Reduced Graphene Oxide Mediated Binding of M (M = Mg, Mn) with Co ions, Chemical Stability and Charge Storability Enhancements of Spinal-Type Hierarchical MCo2O4 Nanostructures. Electrochimica Acta, 243. pp. 119-128. (Published)

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DOI/Official URL: https://doi.org/10.1016/j.electacta.2017.05.064

Abstract

This paper reports that addition of reduced graphene oxide (rGO) in MgCo2O4 improves the binding of Mg with Co thereby minimizing magnesium dissolution in aqueous alkaline electrolytes and the resulting MgCo2O4/rGO electrodes offered impressive improvements in charge storage properties. An isostructural high performing material, MnCo2O4, is used as a benchmark material in this work. The Mg analogues stored >30% more charges than the Mn-analogues in the 3 M LiOH electrolyte despite the former's lower BET surface area; rGO modification further increased charge storage by >60% than the unmodified analogues. Electrochemical measurements show that a larger surface fraction of the Mg analogue is electrochemically active, irrespective of whether or not rGO is present, which arise from, typically for MgCo2O4/rGO, lower internal resistance, lower Warburg impedance, and lower charge transfer resistance than the other electrodes.

Item Type:	Article
Uncontrolled Keywords:	Renewable energy; Asymmetric supercapacitors; Batteries; Pseudocapacitors
Subjects:	Q Science > QC Physics Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering
Faculty/Division:	Faculty of Industrial Sciences And Technology
Depositing User:	Prof. Dr. Jose Rajan
Date Deposited:	03 Aug 2017 06:47
Last Modified:	27 Jul 2018 01:29
URI:	http://umpir.ump.edu.my/id/eprint/17865
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