期刊
CARBON
卷 183, 期 -, 页码 840-849出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.07.066
关键词
Graphene; Vanadium carbide; Laser scribing; Microsupercapacitor; Flexible device
资金
- National Natural Science Foundation of China [51927803, 51902316, 51525206]
- National Key R&D Program of China [2016YFA0200102, 2016YFB0100100]
- LiaoNing Revitalization Talents Program [XLYC1908015]
In this study, vanadium carbide/reduced graphene oxide (V8C7/rGO) microsupercapacitors (MSCs) were successfully fabricated via laser scribing on ammonium meta-vanadate/graphene oxide (NH4VO3/GO) films, showing excellent electrochemical performance and scalable manufacturing potential.
In-plane microsupercapacitors (MSCs) hold great promise for microscale power source, due to the extremely high power density and ultra-long cycling life. However, the scalable fabrication of flexible MSCs with high energy density remains a major challenge. Here, we demonstrate the fabrication of vanadium carbide/reduced graphene oxide (V8C7/rGO) MSCs via laser scribing on ammonium meta-vanadate/graphene oxide (NH4VO3/GO) films, prepared by efficient continuous centrifugal casting method. More than 20 MSCs can be produced on a flexible substrate in 30 min, showing the potential for scalable fabrication. The laser-induced V8C7/rGO shows highly porous microstructure, where vanadium carbide nanoparticles are in-situ synthesized and uniformly decorated on graphene nanosheets. The well-defined architecture endows V8C7/rGO MSCs with excellent electrochemical performance. The areal capacitance of these devices can be as high as 49.5 mF cm(-2), 11 times higher than that of rGO MSCs. The volumetric energy density and power density can be up to 3.4 mWh cm(-3) and 401 mW cm(-3), respectively, competitive with the commercially available energy storage devices and most reported MSCs. In addition, V8C7/rGO MSCs show excellent flexibility and integrability, as well as long cycling life, promising for practical applications. (C) 2021 Elsevier Ltd. All rights reserved.
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