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Effect of processing parameters on the charge storage properties of MgCo2O4 electrodes

Krishnan, Syam G. and Harilal, Midhun and Izan Izwan, Misnon and Reddy, M. Venkatashamy and Adams, Stefan and Rajan, Jose (2017) Effect of processing parameters on the charge storage properties of MgCo2O4 electrodes. Ceramics International, 43 (15). pp. 12270-12279. ISSN 0272-8842

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Abstract

Three morphologies of magnesium cobaltite (MgCo2O4), viz. cuboidal microcrystals, nanoflowers, and nanospheres, were synthesized using hydrothermal and molten salt methods and evaluated their electrochemical energy storage properties. Among them cuboidal microcrystal and nanoflowers were obtained by a facile hydrothermal route – the former with ethylene glycol and the latter with hexadecyltrimethylammonium bromide as surfactants. The cuboidal microcrystals showed layered flake microstructure with an appreciable space between the layers (~ 100 nm), which would facilitate ion movement between the flakes. The electrochemical studies of the materials revealed the superiority of MgCo2O4 cuboidal microcrystals as a charge storage medium over the nanoflowers and nanospheres, the reasons for this is deeply investigated and reported herewith. The specific charge stored in the MgCo2O4 cuboidal microcrystal electrode was ~ 345 C g−1 at a specific current of 1 A g−1 which was superior to nanoflowers (~ 178 C g−1) and nanospheres (~ 139 C g−1) at the similar current density in 3 M LiOH electrolyte. The MgCo2O4 cuboidal microcrystals also demonstrated superior charge retention (~ 110%) after 3000 cycles over the other electrodes demonstrating its practical utility as a charge storage material.

Item Type: Article
Additional Information: Indexes in Scopus.
Uncontrolled Keywords: Electrodes; Renewable energy; Energy storage materials; Electrochemical studies
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: 06 Sep 2017 04:15
Last Modified: 04 Apr 2018 07:12
URI: http://umpir.ump.edu.my/id/eprint/18398
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