Efficient H adsorption using a bimetallic Ni-Zn zeolite imidazole skeleton

Hydrogen is regarded as one of the most promising energy sources of the future, due to its low-cost, zero-pollution, and high-heat value. Nevertheless, traditional methods of storing hydrogen are commonly accompanied by the risk of leaks and explosions, so how to store and transport hydrogen safely and efficiently is a critical issue that needs to be addressed. Solid-state hydrogen storage is the most attractive way to store hydrogen in nanomaterials by chemical or physical adsorption, which has the advantages of high energy density and good safety. Here, a rational Ni-Zn bimetallic MOF has been constructed by a straightforward synthetic technique, in which the Zn atom was partially replaced by the Ni atom. The micropore rate of the Ni-Zn bimetallic MOFs is higher than that of ZIF-8. In addition, the presence of Ni provides more unsaturated metal sites and strengthens the bonding between hydrogen molecules and Ni, effectively improving the hydrogen storage capacity of Ni-Zn bimetallic MOFs. The experimental results show that the hydrogen adsorption capacity of Ni-Zn bimetallic MOFs can reach 1.35 wt% at 77 K and 1 bar. Ni-Zn bimetallic MOFs with a high micropore rate provide multiple active sites for H 2 adsorption (1.35 wt%, 77 K, 1 bar).