M.S.L. Hudson, O.N. Srivastava, S. Simizu, S.G. Sankar
helium isotherm, nitrogen isotherm, thermal reduction, chemical reduction, pore size analysis
Here, we present the high pressure hydrogen sorption isotherm up to 50 bar of graphene oxide (GO) reduced by thermal reduction (TR-GO), chemical reduction (CR-GO) and graphene like nanosheets decorated with Fe nanoclusters (Fe-GS). GO was first derived by thermal exfoliation of graphite oxide, prepared by modified Standermiur method; further reduction at 623K under high vacuum yields TR-GO. CR-GO has been produced by reduction of GO using hydrazine. Fe-GS has been synthesized through arc discharge between the ends of two graphite rods with one rod carrying Fe nanoparticles. The surface area calculated from nitrogen adsorption isotherm at 77 K using BET method for GO, TR-GO, CR-GO and Fe-GS are 304, 357, 90 and 185 m2g-1, respectively. The skeletal density of TR-GO, CR-GO and Fe-GS determined through He gas probing are 1.8, 2.0 and 1.05 gcm-3, respectively. High pressure hydrogen PCT isotherm of TR-GO, CR-GO and Fe-GS has been determined at 300 K and 77 K. The volume of hydrogen adsorbed by TR-GO, CR-GO and Fe-GS at 77 K and 50 bar is 230 ccstp/gram (2.07 wt.% H2), 60 ccstp/gram (0.54 wt.% H2) and 240 ccstp/gram (2.16 wt.% H2), respectively.