TY - JOUR
T1 - 4.4 v supercapacitors based on super-stable mesoporous carbon sheet made of edge-free graphene walls
AU - Nomura, Keita
AU - Nishihara, Hirotomo
AU - Kobayashi, Naoya
AU - Asada, Toshihiro
AU - Kyotani, Takashi
N1 - Funding Information:
This work was supported by a Grant-in-Aid of the Japan Society for the Promotion of Science (JSPS) Research Fellow 16J06543; a Grant-in-Aid for Scientific Research (A), 17H01042 (H. N.) and 15H01999 (T. K.); the Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials; and the Network Joint Research Center for Materials and Devices. The authors thank Nippon Kodoshi Co., Kuraray Chemical Co., Ltd, and ZEON Corp. for kindly supplying cellulose separators, AC, and SWCNTs.
Publisher Copyright:
© 2019 The Royal Society of Chemistry.
PY - 2019/5
Y1 - 2019/5
N2 - The application of supercapacitors for objectives such as automobiles requires high voltage and high temperature operation, therefore development of new electrode materials that have sufficient stability under such harsh conditions is crucial. In this work, we report the development of seamless mesoporous carbon sheet consisting of continuous graphene walls, which exhibits extraordinarily high stability under high voltage and high temperature conditions. The sheet contains very few carbon edge sites (only 4% of the number present in conventional activated carbons) despite its high specific surface area (1500 m2 g-1), and it is possible to use it to assemble symmetric supercapacitors with excellent stability under 3.5 V@60 °C and 4.4 V@25 °C conditions, even using a conventional electrolyte (1 M Et3MeNBF4/propylene carbonate). Moreover, high-voltage operation at 4.4 V results in a 2.7 times higher energy density compared to that achieved using conventional activated carbons.
AB - The application of supercapacitors for objectives such as automobiles requires high voltage and high temperature operation, therefore development of new electrode materials that have sufficient stability under such harsh conditions is crucial. In this work, we report the development of seamless mesoporous carbon sheet consisting of continuous graphene walls, which exhibits extraordinarily high stability under high voltage and high temperature conditions. The sheet contains very few carbon edge sites (only 4% of the number present in conventional activated carbons) despite its high specific surface area (1500 m2 g-1), and it is possible to use it to assemble symmetric supercapacitors with excellent stability under 3.5 V@60 °C and 4.4 V@25 °C conditions, even using a conventional electrolyte (1 M Et3MeNBF4/propylene carbonate). Moreover, high-voltage operation at 4.4 V results in a 2.7 times higher energy density compared to that achieved using conventional activated carbons.
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U2 - 10.1039/c8ee03184c
DO - 10.1039/c8ee03184c
M3 - Article
AN - SCOPUS:85064086523
VL - 12
SP - 1542
EP - 1549
JO - Energy and Environmental Science
JF - Energy and Environmental Science
SN - 1754-5692
IS - 5
ER -
