▎ 摘　　要

In this study, different types of graphene were synthesized to investigate hydrogen adsorption capacity at different pressures (0-34bar) at room temperature (298K). Graphene and nanoporous graphene were prepared by Chemical Vapor Deposition (CVD) method, using methane as a carbon source at a temperature of 900 degrees C over copper plates and nickel oxide nanocatalyst. The nickel oxide nanocatalyst was prepared by sol-gel method, whereas graphene oxide was prepared through modified Hummer's method. The products were characterized by X-ray diffraction, field emission-scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller and Raman spectroscopy. The adsorption of hydrogen was done by volumetric method. High adsorption capacity was achieved in nanoporous graphene because of its high pore volume (2.11cm(3)/g) and large specific surface area (850m(2)/g). Hydrogen adsorption values for nanoporous graphene, graphene and graphene oxide were determined as 2.56, 1.70 and 0.74wt%, respectively. In addition, the hydrogen adsorption of graphene nanostructures fitted nicely to the selected two-parameter and three-parameter adsorption isotherm models. The adsorption isotherm model coefficients have been found for a 0-34bar pressure range. The parameter values for all adsorbents showed proper conformity to the model and experimental data. Copyright (c) 2016 John Wiley & Sons, Ltd.