CTAB-assisted solution combustion synthesis of defect-rich crumpled-sheet like magnesium aluminate for energy storage applications

Résumé fourni par la source

Supercapacitors have gained considerable focus for storage and utilization of renewable energy. The performance of supercapacitors is strongly dependent on the properties and design of electrode materials. The present research focuses on development of non-toxic, low-cost and environmentally-friendly magnesium aluminate (MAL) spinel compound-based electrode materials for supercapacitor applications. Three MAL samples were synthesized by solution combustion technique at different precursor salt to fuel (glycine) ratios (1:1, 1:3 and 1:6), and one sample was produced by incorporating cetyltrimethylammonium bromide (CTAB) surfactant in the precursor solution, labelled as MAL-3G-CT. XRD analysis showed the variation in salt to fuel ratio resulted in the formation of secondary phase, whereas the addition of CTAB resulted in a pure spinel phase. The morphology of MAL changes from chunks to crumpled-sheet-like due to CTAB as confirmed by SEM. Photoluminescence confirmed an increase in defect density for MAL-CTAB sample compared to other MAL samples. Due to the low crystallite size, increased defect density and distinct morphology, MAL-CTAB displayed the highest specific capacity of 1265 Cg -1 at 2 Ag -1 current density. The study widely explored the synthesis condition, especially the usefulness of surfactant addition during solution combustion synthesis of electrode materials for supercapacitor applications.

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