Hydrogen uptake of reduced graphene oxide and graphene sheets decorated with Fe nanoclusters |
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| Authors: | M. Sterlin Leo Hudson Himanshu Raghubanshi Seema Awasthi T. Sadhasivam Ashish Bhatnager Satoru Simizu S.G. Sankar O.N. Srivastava |
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| Affiliation: | 1. Department of Physics, Central University of Tamil Nadu, Thiruvarur 610004, India;2. Nanotechnology Application Centre, University of Allahabad, Allahabad 211002, India;3. School of Physics, Hyderabad Central University, Hyderabad 500046, India;4. Department of Nanoscience and Technology, Alagappa University, Karaikudi 630003, India;5. MNRE Mission Mode Project Unit, Department of Physics, Banaras Hindu University, Varanasi 221005, India;6. Advanced Materials Corporation, Pittsburgh, PA 15220, USA |
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| Abstract: | Graphene oxide (GO) has been prepared by employing modified Staudenmaier's method through thermal exfoliation of graphite oxide. High pressure hydrogen sorption isotherms up to 50 bar of GO, reduced by thermal reduction (TR-GO), chemical reduction (CR-GO) and graphene sheets decorated with Fe nanoclusters (Fe-GS) have been investigated. Thermal reduction of GO at 623 K under high vacuum yields TR-GO. Chemical reduction of GO using hydrazine forms CR-GO. Fe-GS was synthesized through arc-discharge between the ends of two graphite rods with one rod carrying Fe nanoparticles. The surface areas of these graphene samples were determined from the nitrogen adsorption isotherm employing Brunauer, Emmett and Teller (BET) method. Kelvin's equation was used to determine the pore size distribution of all graphene based samples. Hydrogen pressure-composition isotherms (PCI) were determined at 300 K and at 77 K, between 0.1 and 50 bar. Further, in this paper, we present a comparative adsorption isotherm analysis of hydrogen and helium on TR-GO. This reveals that the volume of hydrogen and helium adsorbed by TR-GO is nearly equal. The similar uptake volume determined for both hydrogen and helium indicates the possibility of monolayer adsorption of hydrogen and also nearly similar binding energy between TR-GO and H2/He. |
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| Keywords: | Helium isotherm Nitrogen isotherm Thermal reduction Chemical reduction Pore size distribution Metal decoration on graphene |
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