Novel MOF/COF dual carrier anchoring Ru nanoparticles for improved hydrogen production by hydrolysis of NaBH4

Here, a facile bottom-up strategy has been employed to grow metal organic frameworks on covalent organic frameworks, forming a ZIF-67/JUC-505 dual-carrier material for the first time. Subsequently, ultrafine Ru nanoparticles (NPs) were loaded onto it through hydrogen reduction, resulting in the Ru-(ZIF-67/JUC-505) catalyst. Transmission Electron Microscope and Brunauer Emmett Teller analysis indicate that ZIF-67/JUC-505 possesses a porous structure with both micropores and mesopores, and the ruthenium anchored on it forms ultrafine Ru nanoparticles (< 2nm). The specific surface area of Ru-(ZIF-67/JUC-505) obtained is 638.8m²·g⁻¹. The study on performance of NaBH4 hydrolysis illustrates that Ru-(ZIF-67/JUC-505) with 2.38wt.% Ru NPs has the highest catalytic activity. Specifically, the hydrogen generation rate (HG rate) of NaBH4 is 34790mL∙min-1∙g-1 at 303K, significantly higher than Ru/ZIF-67 (2511mL∙min-1∙g-1) and Ru/JUC-505 (3794mL∙min-1∙g-1) single-carrier catalysts. Meanwhile, the Ru-(ZIF-67/JUC-505) catalyst also shows excellent cycling stability, that is the Ru-(ZIF-67/JUC-505) still maintained 91.0% of its initial performance after 10 cycles. The mechanistic study indicates that the cycling stability is ascribed to the dual-carrier material ZIF-67/JUC-505. Exploring novel porous hybrid materials is of great significance, and it provides potential for material separation, catalysis and other related fields.