Syntheses, Characterizations And Hydrogen Storage Of MOF/Pt-GO Composites

This paper reviews the hydrogen spillover effect in Metal-organic frameworks.MOF (MIL-101, HKUST-1)/graphene composites with different doped amounts ofgraphene oxide (GO) and Pt-GO have been prepared through in-situ synthesizedmethod by the reactions of GO, metal ion and organic ligand. The MIL/GO,MIL/Pt-GO and HKUST-1/Pt-GO composite materials were characterized by X-rayPowder diffraction, IR spectroscopy, thermal analysis, scanning electron microscopyand hydrogen adsorption under different conditions. The results show that:(1) GO substrates was doped into MIL-101, when the content of doped value was2wt%and5wt%, new phase was generated. It shows that the thermostability but verylow adsorption quantity. The20wt%GO content composite with has similar pore sizedistributions with new pores and micropore surface areas. This structure hassynergistic effect in the hydrogen adsorption.(2) Pt-GO was doped into MIL-101, the BET surface area was declined with theincreased amount of materials, hydrogen storage properties was reduced moreobviously under the conditions of low temperature atmospheric pressure, but thehydrogen storage properties of the doped2wt%and5wt%content were improvedsignificantly at room temperature conditions. It shows that in-situ doping way to buildhydrogen spillover effect in MOFs is feasible.(3) The composite material produced by doped Pt-GO has similar characteristics ofMIL/GO. HKUST-1/Pt-GO morphology tends to amorphous state with the highdoping content. The hydrogen storage properties of the5wt%content GO is almostthe same as the undoped sample in77K condition. But hydrogen storage performancethe10wt%content of GO doped in MOF declines significantly. The hydrogenstorage capacity of5wt%content was also improved significantly at298K conditions.This implies that the effect of hydrogen spillover is prone to happen at roomtemperature.