Gd₃Fe₅O₁₂/MgAl-LDH nanocomposites: Sonochemical synthesis, optimization and electrochemical hydrogen storage studies

The development of an eco-friendly and pollution-free hydrogen storage cell power system has received considerable research attention in recent years. Several prominent developments in energy storage mechanisms have been made during the last decade, influencing innovation, exploration, and the probable path for improving energy storage knowledge. We propose a hydrogen energy storage system based on novel electrode materials and electrochemical methods. A series of nanocomposites based on MgAl-LDH and Gd₃Fe₅O₁₂ garnet were designed as active materials. Ultrasonic radiation was used for the synthesis of Gd₃Fe₅O₁₂/MgAl-LDH nanocomposites. Structures of Gd₃Fe₅O₁₂ without any impurities were achieved by sonication power of 90 W/cm² while the synthetic sample without sonication power led to the synthesis of Gd₃Fe₅O₁₂ in the presence of GdFeO₃ phase. The hydrogen storage capacity for pristine MgAl-LDH and Gd₃Fe₅O₁₂ was measured at 213 and 388 mAhg⁻¹ after 15 cycles, respectively. Then, capacity for Gd₃Fe₅O₁₂/MgAl-LDH nanocomposites increased to 316 mAhg⁻¹ at current of 1 mA in 15th cycles. Newly developed electrode materials such as Gd₃Fe₅O₁₂/MgAl-LDH with mechanisms such as spillover, redox and physical adsorption are excellent candidates for energy storage power systems.