Recently, Hydrogen physisorption in porousmaterials such as zeolites, CNTs, MOFs and carbon-base structure have beenreceived remarkable attention among researchers.
Carbon-base structures such asgraphene due to being easy-synthesized and inexpensive are a field of greatcurrent interest to increase the amount of hydrogen uptake in the ambienttemperature and pressure. Another feature of graphene which makes it attractiveis the lightweight. By reduction of a colloidal suspension of exfoliatedgraphite oxide, Srinivas et al.5 reported hydrogenuptake capacity in 10 bar was about 1.2 wt % and 0.1 wt % at 77 K and298 K, respectively. By chemisorbing calcium on both side of graphene,Ataka et al.
6 calculated the hydrogenstorage 8.4 wt%. In this calculation, orientation of calcium on the various sideof graphene was studied.
Hydrogen adsorption in single sheets of powdergraphene was studied by Ma et al.7 in 2008. The hydrogen was stored in graphene0.4 wt% and <0.2 wt% at 77 K under 100 kPa and ambient temperature under 6MPa respectively. Me et al. synthesized graphene by using a chemicalexfoliation from graphite. The main features for improving adsorption ofhydrogen in graphene are the structure enhancement and also fictionalizing.
Wang et al.8 investigated in 3dgraphene with Ni–B nanoalloys and reported 4.4 wt% at 77 K and 106 kPa. DopingNi-B nanoalloys caused spillover which can be resulted in increasing hydrogen uptakeby chemisorption method. The hydrogenspillover occurred whenever the hydrogen molecules were dissociated and to betransported through the surface. This technique has improved the hydrogenadsorption by providing hydrogen atoms which can be adsorbed by various ways,such as, physisorption, chemisorption and capsulation.
The interaction energybetween adsorbent and adsorbed will be decreased in this technique, however,the atoms of hydrogen storage more easily9, 10. In this regard, in thispaper the 3d graphene has been synthesized and investigated for enhancing thestructures pores and also the best time and temperature for appearance quality of3d graphene were discussed. The characterization of 3d graphene also isanalyzed by FESEM, XRD and RAMAN. The hydrogen uptake of 3d graphene has beenstudied and a comparison between different structures of 3d graphene forstoring was made.
