Reversibly compressible and freestanding monolithic carbon spherogels

Miralem Salihovic, Gregor A. Zickler, Gerhard Fritz-Popovski, Maike Ulbricht, Oskar Paris, Nicola Hüsing, Volker Presser, Michael S. Elsaesser

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

5 Zitate (Scopus)

Abstract

We present a versatile strategy to tailor the nanostructure of monolithic carbon aerogels. By use of an aqueous colloidal solution of polystyrene in the sol-gel processing of resorcinol-formaldehyde gels, we can prepare, after supercritical drying and successive carbonization, freestanding monolithic carbon aerogels, solely composed of interconnected and uniformly sized hollow spheres, which we name carbon spherogels. Each sphere is enclosed by a microporous carbon wall whose thickness can be adjusted by the polystyrene concentration, which affects the pore texture as well as the mechanical properties of the aerogel monolith. In this study, we used monodisperse polystyrene spheres of approximately 250 nm diameter, which result in an inner diameter of the final hollow carbon spheres of approximately 200 ± 5 nm due to shrinkage during the carbonization process. The excellent homogeneity of the samples, as well as uniform sphere geometries, are confirmed by small- and angle X-ray scattering. The presence of macropores between the hollow spheres creates a monolithic network with the benefit of being reversibly compressible up to 10% linear strain without destruction. Electrochemical tests demonstrate the applicability of ground and CO 2 activated carbon spherogels as electrode materials.

OriginalspracheEnglisch
Seiten (von - bis)189-195
Seitenumfang7
FachzeitschriftCarbon
Jahrgang153.2019
AusgabenummerNovember
Frühes Online-Datum2 Juli 2019
DOIs
PublikationsstatusVeröffentlicht - Nov. 2019

Bibliographische Notiz

Funding Information:
For financial support of this study, the Interreg V Programm-AB97 TFP-HyMat is kindly acknowledged. VP kindly thanks Eduard Arzt ( INM ) for his continuing support. Maurizio Musso and Andreas Reyer (University of Salzburg) are kindly acknowledged for Raman measurements. We thank Thomas Wimmer (FH Salzburg) for recording the compression test data. TEM measurements were carried out on a JEOL JEM F200 TEM which was funded by Interreg Österreich - Bayern 2014 - 2020 Programm-AB29 - "Synthese, Charakterisierung und technologische Fertigungsansätze für den Leichtbau "n2m" (nano-to-macro)".

Publisher Copyright:
© 2019 The Authors

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