Effect of processing parameters on the charge storage properties of MgCo2O4 electrodes
| Autor: | M. V. Reddy, Stefan Adams, Midhun Harilal, Syam G. Krishnan, Izan Izwan Misnon, Rajan Jose |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Process Chemistry and Technology Nanotechnology 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure Electrochemistry 01 natural sciences Hydrothermal circulation 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Cobaltite chemistry.chemical_compound chemistry Chemical engineering Electrode Materials Chemistry Ceramics and Composites Molten salt 0210 nano-technology Ethylene glycol |
| Zdroj: | Ceramics International. 43:12270-12279 |
| ISSN: | 0272-8842 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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