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Title: Nanoporous spongy graphene: Potential applications for hydrogen adsorption and selective gas separation
Authors: Kostoglou, Nikolaos 
Constantinides, Georgios 
Charalambopoulou, Georgia Ch 
Steriotis, Th 
Polychronopoulou, Kyriaki 
Li, Yuanqing 
Liao, Kin 
Ryzhkov, Vladislav 
Mitterer, Christian 
Rebholz, Claus 
Major Field of Science: Engineering and Technology
Field Category: Nano-Technology
Keywords: Freeze drying;Gas selectivity;Gas sorption;Graphene;Nanoporous sponge;Wet reduction
Issue Date: 1-Dec-2015
Source: Thin Solid Films, 2015, vol. 596, pp. 242-249
Volume: 596
Start page: 242
End page: 249
Journal: Thin Solid Films 
Abstract: In the present work, a nanoporous (pore width ~ 0.7 nm) graphene-based sponge-like material with large surface area (~ 350 m2/g) was synthesized by wet chemical reduction of graphene oxide in combination with freeze-drying. Surface morphology and elemental composition were studied by scanning and transmission electron microscopy combined with energy dispersive X-ray spectroscopy. Surface chemistry was qualitatively examined by Fourier-transform infrared spectroscopy, while the respective structure was investigated by X-ray diffraction analysis. Textural properties, including Brunauer-Emmet-Teller (BET) surface area, micropore volume and surface area as well as pore size distribution, were deduced from nitrogen gas adsorption/desorption data obtained at 77 K and up to 1 bar. Potential use of the spongy graphene for gas storage and separation applications was preliminarily assessed by low-pressure (0-1 bar) H2, CO2 and CH4 sorption measurements at different temperatures (77, 273 and 298 K). The adsorption capacities for each gas were evaluated up to ~ 1 bar, the isosteric enthalpies of adsorption for CO2 (28-33 kJ/mol) and CH4 (30-38 kJ/mol) were calculated using the Clausius-Clapeyron equation, while the CO2/CH4 gas selectivity (up to 95:1) was estimated using the Ideal Adsorbed Solution Theory (IAST).
ISSN: 0040-6090
DOI: 10.1016/j.tsf.2015.06.060
Rights: © Elsevier
Attribution-NonCommercial-NoDerivs 3.0 United States
Type: Article
Affiliation : University of Cyprus 
Montanuniversität Leoben 
Cyprus University of Technology 
National Center for Scientific Research Demokritos 
Khalifa University of Science 
Fibrtec Incorporation 
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