High surface area graphene foams by chemical vapor deposition
Drieschner, Simon (Technische Universität München. Physik Department)
Weber, Michael (Technische Universität München. Physik Department)
Wohlketzetter, Jörg (Technische Universität München. Physik Department)
Vieten, Josua (Technische Universität München. Physik Department)
Makrygiannis, Evangelos (Technische Universität München. Physik Department)
Blaschke, Benno M. (Technische Universität München. Physik Department)
Morandi, Vittorio (Consiglio Nazionale delle Ricerche. Istituto per la microelettronica e microsistemi)
Colombo, Luigi (Texas Instruments. Analog Technology Development)
Bonaccorso, Francesco (Istituto Italiano di Tecnologia. Graphene Labs)
Garrido, Jose (Institut Català de Nanociència i Nanotecnologia)

Data:	2016
Resum:	Three-dimensional (3D) graphene-based structures combine the unique physical properties of graphene with the opportunity to get high electrochemically available surface area per unit of geometric surface area. Several preparation techniques have been reported to fabricate 3D graphene-based macroscopic structures for energy storage applications such as supercapacitors. Although reaserch has been focused so far on achieving either high specific capacitance or high volumetric capacitance, much less attention has been dedicated to obtain high specific and high volumetric capacitance simultaneously. Here, we present a facile technique to fabricate graphene foams (GF) of high crystal quality with tunable pore size grown by chemical vapor deposition. We exploited porous sacrificial templates prepared by sintering nickel and copper metal powders. Tuning the particle size of the metal powders and the growth temperature allow fine control of the resulting pore size of the 3D graphene-based structures smaller than 1 μm. The as-produced 3D graphene structures provide a high volumetric electric double layer capacitance (165 mF cm-³). High specific capacitance (100 Fg-¹) is obtained by lowering the number of layers down to single layer graphene. Furthermore, the small pore size increases the stability of these GFs in contrast to the ones that have been grown so far on commercial metal foams. Electrodes based on the as-prepared GFs can be a boost for the development of supercapacitors, where both low volume and mass are required.
Ajuts:	European Commission 696656
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Cvd ; EDLC ; Graphene foams ; High surface area
Publicat a:	2D Materials, Vol. 3, no. 4 (October 2016) , art. 045013, ISSN 2053-1583

DOI: 10.1088/2053-1583/3/4/045013

Post-print 18 p, 11.9 MB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Institut Català de Nanociència i Nanotecnologia (ICN2)
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