Catalyst‐Free Synthesis of Porous Graphene Networks as Efficient Sorbents for CO2 and H2. Issue 7 (7th May 2015)

• Record Type: Journal Article
• Authors: Song, Kyung Seob; Coskun, Ali
• Is Part Of: ChemPlusChem. Volume 80:Issue 7(2015:Jul.)
• Page Start: 1127
• Page End: 1132
• Publication Date: 2015-05-07
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cplu.201500061
• Languages: English
• ISSNs: 2192-6506

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Reported is a catalyst‐free synthetic route for the preparation of porous graphene networks (PGNs) incorporating benzimidazole linkages through the condensation reaction between ester‐functionalized graphene sheets and organic aromatic amine linkers. PGNs showed remarkable thermal stability at temperatures of up to 350 °C in air. This emphasizes the importance of the formation of robust CC bonds by means of the Johnson–Claisen rearrangement for the covalent functionalization of graphene layers. PGNs exhibited high surface areas up to 732 m² g⁻¹ and showed the highest CO₂ uptake capacity (3.75 mmol g⁻¹ at 273 K, 1 bar) along with a remarkable CO₂/N₂ selectivity (130 at 273 K, 1 bar) of all the GO and graphene frameworks reported to date. PGNs as low‐cost, efficient solid sorbents also exhibited high affinity towards H₂ (1.2 wt % at 77 K, 1 bar).</p> </abstract>