Enhanced synthesis of La–Ni-based hydrogen sorption materials: Evaluation of physical characterization and desorption properties

Hydrogen is increasingly recognized as a promising alternative energy source due to its ability to reduce fossil fuel dependence and mitigate global climate change. As a clean energy carrier, it offers a sustainable pathway to low-carbon systems, supporting the decarbonization of transportation, industry, and power generation. Its versatility and abundance further highlight its potential as a key component in the transition to a greener energy future. Developing efficient hydrogen storage materials is critical for advancing hydrogen energy applications. This study explores the synthesis of La–Ni-based materials using the combustion–CO reduction method to enhance hydrogen sorption properties. The LaNi₅ phase, a prominent hydrogen sorption material, was synthesized through combustion-gel synthesis followed by CO reduction at 500°C, 600°C, and 700°C. Comprehensive characterization was performed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), particle size analysis (PSA), and chemisorption (TPD-H₂) to examine phase formation, particle size, surface properties, and catalytic activity. The findings reveal that the combustion-gel synthesis-CO reduction method improves the hydrogen storage performance of La–Ni-based materials while providing a scalable production approach. The material reduced at 500°C for 5 hours exhibited the highest hydrogen desorption properties, achieving an H₂ uptake of 0.0396 mmol/g, alongside the smallest particle size among the samples. These results underscore the significance of reduction temperature, particle size, and phase formation in determining hydrogen storage performance. This work highlights the potential of tailored La–Ni-based materials for advanced hydrogen sorption applications, paving the way for more efficient energy systems.