Details

Autor(en) / Beteiligte

• Romano, Valentino
• Martín‐García, Beatriz
• Bellani, Sebastiano
• Marasco, Luigi
• Kumar Panda, Jaya
• Oropesa‐Nuñez, Reinier
• Najafi, Leyla
• Del Rio Castillo, Antonio Esau
• Prato, Mirko
• Mantero, Elisa
• Pellegrini, Vittorio
• D'Angelo, Giovanna
• Bonaccorso, Francesco

Titel

Flexible Graphene/Carbon Nanotube Electrochemical Double‐Layer Capacitors with Ultrahigh Areal Performance

Ist Teil von

• ChemPlusChem (Weinheim, Germany), 2019-07, Vol.84 (7), p.882-892

Ort / Verlag

Germany

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Wiley Blackwell Single Titles

Beschreibungen/Notizen

• The fabrication of electrochemical double‐layer capacitors (EDLCs) with high areal capacitance relies on the use of elevated mass loadings of highly porous active materials. Herein, we demonstrate a high‐throughput manufacturing of graphene/carbon nanotubes hybrid EDLCs. The wet‐jet milling (WJM) method is exploited to exfoliate the graphite into single‐few‐layer graphene flakes (WJM‐G) in industrial volumes (production rate ca. 0.5 kg/day). Commercial single‐/double‐walled carbon nanotubes (SDWCNTs) are mixed with graphene flakes in order to act as spacers between the flakes during their film formation. The WJM‐G/SDWCNTs films are obtained by one‐step vacuum filtration of the material dispersions, resulting in self‐standing, metal‐ and binder‐free flexible EDLC electrodes with high active material mass loadings up to around 30 mg cm−2. The corresponding symmetric WJM‐G/SDWCNTs EDLCs exhibit electrode energy densities of 539 μWh cm−2 at 1.3 mW cm−2 and operating power densities up to 532 mW cm−2 (outperforming most of the reported EDLC technologies). The EDCLs show excellent cycling stability and outstanding flexibility even in highly folded states (up to 180°). Just carbon! The combination of graphene and carbon nanotubes allows for self‐standing, flexible, and binder‐ and metal‐free electrodes for electrochemical double‐layer capacitors with mass loadings up to 30 mg cm−2. Furthermore, the large‐scale production of few‐layer graphene dispersions by wet‐jet milling exfoliation, together with a facile vacuum filtration approach for electrode fabrication offer potential for the mass production of these devices.