Development of a New Composite Bimetallic Material to Increase the Storage Capacity of Hydrogen

The paper has developed materials based on MOF-Y-BTC, MOF-Ho-BTC, MOF-(Ho-Y)-BTC for safe and efficient storage of hydrogen. The solvothermal method was used to obtain metallorginech frame compounds based on Y3+, Ho3+ and bimetallic composite frames based on them. It has been established that MOF-Y-BTC has a tetragonal crystal structure with a lattice type P with a spatial group number of 95, the MOF-Ho-BTC structure is characterized as tetragonal with a number of spatial groups of 43, the bimetallic MOF-(Ho-Y)-BTC also has a tetragonal syngony. In the MOF-(Ho-Y)-BTC structure, holmium and yttrium atoms are surrounded by oxygen atoms, which form a tetragonal bipyramide crystallizing according to the type of crystal lattice P. The volume of micro- (w0) and mesopores (ws) has the greatest value for the MOF-(Ho-Y)-BTC sample, which also correlates with the specific surface area calculated by the BET method, which is 892,6 m2/g. Total adsorption was quantified and amounted to MOF-Y-BTC 50 mmol/g, MOF-Ho-BTC 107 mmol/g, MOF-(Ho-Y)-BTC 122 mmol/g. At the same time, the hydrogen accumulated in the MOF interacts with various MOF centers (ionic and ligand), which leads to the implementation of an associative mechanism of adsorption and chemisorption. © 2025 Elsevier B.V., All rights reserved.