Impact of Thermal Management on Hydrogen Absorption and Desorption Kinetics in AB2 Metal Hydride Systems

This study examines hydrogen absorption and desorption in an AB ₂ -type metal hydride storage system, focusing on the impact of thermal management. A cylindrical vessel with a volume of 3.3 L was tested under passive conditions and under active control – with water cooling during absorption and external heating during desorption. Cooling at 11 ^◦ C to 15 ^◦ C reduced the absorption time from 22 h 45 min to 5 h to 6 h (approximately 76% faster), while heating at 45 ^◦ C to 55 ^◦ C reduced the desorption time from 29 h 46 min to 7 h 10 min (approximately 71% faster). The system stored up to 2000 NL (approximately 180 g) of hydrogen, achieving a gravimetric capacity of 1.65–1.74 wt.%. The results show that effective thermal management significantly improves kinetics, shortens cycle time, and increases overall energy efficiency. These findings provide practical guidelines for optimizing metal hydride hydrogen storage for both stationary and mobile applications.