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High‐Power Graphene–Carbon Nanotube Hybrid Supercapacitors
Author(s) -
Ansaldo Alberto,
Bondavalli Paolo,
Bellani Sebastiano,
Del Rio Castillo Antonio Esau,
Prato Mirko,
Pellegrini Vittorio,
Pog Grégory,
Bonaccorso Francesco
Publication year - 2017
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201700093
Subject(s) - supercapacitor , materials science , graphene , carbon nanotube , exfoliation joint , nanotechnology , capacitance , graphite , electrode , electrolyte , pseudocapacitor , deposition (geology) , composite material , chemistry , paleontology , sediment , biology
Abstract The bulky structure of current power sources is hindering the widespread development of next‐generation electronics. Here, we propose a graphene/single wall carbon nanotube (SWCNT) hybrid structure for the realization of high‐performance supercapacitors. The devices are assembled by using 2 cm 2 area hybrid graphene/SWCNT electrodes, designed by combining a scalable solution‐processing method (e.g., liquid phase exfoliation of pristine graphite and de‐bundling of SWCNTs) with dynamic spray‐gun deposition, and an aqueous electrolyte (3 m LiNO 3 ). This architecture allows us to effectively balance the supercapacitors performance achieving remarkable electrode gravimetric capacitance and specific energy at 2 mV s −1 of 104 F g −1 , 20.8 Wh kg −1 , respectively, and a maximum specific power of 92.3 kW kg −1 . Our results, based on industrially scalable materials production and deposition methods, represent a real breakthrough compared to state‐of‐the‐art lab‐scale devices.