Advancing next-generation energy storage technologies requires electrode materials that provide high performance, sustainability, cost-effectiveness and excellent long-term cycling stability. This study aims to develop and evaluate a bimetallic MgAl2O4/reduced graphene oxide (rGO) composite to overcome the intrinsic limitations of bimetallic oxides, particularly low electronic conductivity and significant volume expansion during charge/discharge processes.
A MgAl2O4/rGO nanocomposite was synthesized and systematically optimized to enhance electrochemical performance. Structural, morphological and surface characteristics were examined using X-ray diffraction, X-ray photoelectron spectroscopy and Brunauer Emmett Teller analyses, while thermal stability was assessed via thermogravimetric analysis. Electrochemical performance was evaluated in a KOH electrolyte using cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy.
The composite displayed a well-defined phase structure, high surface area and good thermal stability. Cyclic voltammetry results demonstrated strong pseudocapacitive behavior, and galvanostatic charge/discharge measurements showed high energy and power densities with low internal resistance. Electrochemical impedance spectroscopy analysis confirmed improved charge transfer and reduced impedance. The electrode exhibited excellent cycling stability, indicating that the MgAl2O4/rGO composite successfully mitigates conductivity and volume-expansion issues commonly associated with bimetallic oxides.
This work presents a novel MgAl2O4/rGO bimetallic nanocomposite engineered to enhance conductivity, structural stability and overall electrochemical performance. This study highlights a promising, sustainable and cost-effective electrode material suitable for next-generation high-performance energy storage systems.
