Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1607726 | Journal of Alloys and Compounds | 2016 | 7 Pages |
Abstract
Manganese cobaltite (MnCo2O4) is currently under screening as a high performance supercapacitor electrode owing to its high theoretical capacitance, improved electrical conductivity and long term cyclic stability. Herein, we report synthesis of MnCo2O4 cuboidal microcrystals using hydrothermal method and compare its performance with its flakes prepared by solid combustion process. Crystal structure, surface properties, and electrochemical properties of the flakes are studied using X-ray diffraction, gas adsorption, field emission scanning electron microscopy, cyclic voltammetry, galvanostatic charge-discharge cycling, and electrochemical impedance spectroscopy. The electrochemical properties of MnCo2O4 flakes synthesized using hydrothermal synthesis are superior to that synthesized using the solid combustion process. Electrochemical properties of the cuboidal microcrystals (â¼specific capacitance, CS â¼600Â FÂ gâ1 @ 0.5Â AÂ gâ1) are superior to those synthesized by the combustion process (CS â¼128Â FÂ gâ1) due to improved faradic utilization of active surface area, layered cuboidal morphology, faster OHâ ion penetration owing to higher diffusion coefficient, and larger voltage range available for electrochemical reaction.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Syam G. Krishnan, Mohd Hasbi Ab Rahim, Rajan Jose,