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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 
Keywords: Freeze drying;Gas selectivity;Gas sorption;Graphene;Nanoporous sponge;Wet reduction
Category: Nano-Technology
Field: Engineering and Technology
Issue Date: 1-Dec-2015
Publisher: Elsevier B.V.
Source: Thin Solid Films, 2015, Volume 596, Pages 242-249
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: 00406090
Rights: © 2015 Elsevier B.V. All rights reserved.
Type: Article
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