Evaluation of hydrogen storage capacity of the synthesized amino-functionalized Cu-based MOF/COF hybrid material

Metal-organic frameworks (MOFs) and covalent-organic frameworks (COFs) are known for their highly ordered crystalline structures and various advantages, including high specific surface area, well-defined accessible pores, controllable porous structure and thermal/chemical stability. The integration of MOFs with COFs offers an innovative approach to developing advanced materials for cutting-edge technological applications including electrochemical hydrogen storage (EHS). Herein, an amino-functionalized Cu-MOF (A-Cu-MOF) was hybridized with Schiff-base Network-1 (SNW-1) which serves as a COF. The synthesized A-Cu-MOF/SNW-1 nanohybrid was thoroughly characterized and utilized for EHS applications. Notably, the specific surface area of the prepared A-Cu-MOF/SNW-1 nanohybrid (341.12 m²g⁻¹) exhibited an increase compared to SNW-1 (262.33 m²g⁻¹) and A-Cu-MOF (221.38 m²g⁻¹), providing more active sites for EHS. The hydrogen storage capacity measurements were carried out using cyclic voltammetry (CV) and chronopotentiometry (CP) techniques. According to the results, the twentieth discharge capacities of the synthesized A-Cu-MOF, SNW-1, and A-Cu-MOF/SNW-1 nanohybrid were 3500, 4000, and 5500 mAh g⁻¹, respectively. The superior EHS capacity and structural characteristics highlight the exceptional potential of the A-Cu-MOF/SNW-1 nanohybrid as a promising material for hydrogen storage.