Enhanced hydrogen sorption properties over Mg~(2+)modified solvothermal synthesized HKUST-1(Mg~(2+)/HKUST-1)

摘要

The development of high capacity materials for hydrogen storage such as MOFs to support the utilization of hydrogen as a renewable energy source is an attractive area for further investigation.In this research,a well-known type of MOF,specifically HKUST-1,was synthesized using the solvothermal method and ex-situ modified with magnesium(II)ions at 3,5,and 10 wt% to serve as additional binding sites to form Mg~(2+)/HKUST-1.The resulting materials were analysed via XRD,FTIR,SEM-EDX,and a nitrogen sorption isotherm.Hydrogen sorption measurements were conducted using a Sievert system.The structure and morphology of HKUST-1 remained stable after it was embedded with Mg~(2+)according to X-ray diffraction,FTIR,and SEM analysis.Nitrogen sorption isotherm revealed that before and after modification with Mg~(2+),the materials could be classified as microporous and the surface area increased significantly from 713.283 to 1200.211 m~2/g.The presence of Mg~(2+)in the HKUST-1 enhanced its hydrogen sorption capacity up to 0.292 wt% at 1.2 bar under an operational temperature of 30°C and 0.48 wt% at 80°C(1.4 bar).