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

Abstract

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.