Nanoporous spongy graphene: Potential applications for hydrogen adsorption and selective gas separation

Nikolaos Kostoglou, Georgios Constantinides, Georgia Charalambopoulou, Theodore Steriotis, Kyriaki Polychronopoulou, Yuanqing Li, Kin Liao, Vladislav Ryzhkov, Christian Mitterer, Claus Rebholz

Research output: Contribution to journalArticle

10 Citations (Scopus)

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, CO2and CH4sorption 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/CH4gas selectivity (up to 95:1) was estimated using the Ideal Adsorbed Solution Theory (IAST).

Original languageEnglish
Pages (from-to)242-249
Number of pages8
JournalThin Solid Films
Volume596
DOIs
Publication statusPublished - 1 Dec 2015
Externally publishedYes

Keywords

  • Freeze drying
  • Gas selectivity
  • Gas sorption
  • Graphene
  • Nanoporous sponge
  • Wet reduction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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  • Cite this

    Kostoglou, N., Constantinides, G., Charalambopoulou, G., Steriotis, T., Polychronopoulou, K., Li, Y., Liao, K., Ryzhkov, V., Mitterer, C., & Rebholz, C. (2015). Nanoporous spongy graphene: Potential applications for hydrogen adsorption and selective gas separation. Thin Solid Films, 596, 242-249. https://doi.org/10.1016/j.tsf.2015.06.060