A method for producing a composite material for storing hydrogen based on the BN-cal-ti system

Abstract

This invention relates to hydrogen energy, specifically to the development of composite materials based on boron nitride (BN) with alloying additives for efficient hydrogen storage. The invention proposes a method for producing hydride materials based on boron nitrides with alloying components, pertaining to the storage of hydrogen in solid materials produced using spark plasma sintering technology. The objective of the proposed technical solution is to develop a method for producing hydride composite materials based on boron nitride with alloying additives, ensuring high hydrogen storage capacity and stability during cyclic use. The technical result of using the invention is to increase the material's hydrogen absorption capacity and improve its thermodynamic properties through the optimal selection of alloying elements and synthesis conditions. The essence of the invention lies in the development of a method for producing hydride composite materials based on boron nitrides (BN) with alloying additives (C, Al, Ti), as well as with a combination of methods of high-energy processing of a powder mixture (mechanical activation and heat treatment in an inert environment) providing optimal structural and thermodynamic properties of materials for the efficient storage of hydrogen. A method for producing a composite material for storing hydrogen based on the BN-C-Al-Ti system is proposed, which includes grinding a powder mixture followed by mechanical activation in a ball mill and heat treatment, characterized in that that mechanochemical activation in a planetary mill at a speed of 300-500 rpm for 8-12 hours with a mass ratio of balls to powder of 20:1 is carried out for each powder, followed by heat treatment in an inert environment at 900-1100°C for 2-4 hours at a pressure of 0.1-0.5 MPa, grinding of the cooled components to a particle size of <10 μm and obtaining a composite material with increased hydrogen capacity of >6 wt.% H₂, improved sorption / desorption kinetics and stable resource durability without degradation of properties after 500 cycles.