期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 10, 页码 11669-11678出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b22408
关键词
supercapacitor; carbon nanofiber; high surface area; graphene quantum dot; ultrahigh rate
资金
- National Natural Science Foundation of China [51702275, 51972342, U1703251, 21671166, U1610252]
- Scientific Research Program of the Higher Education Institution of Xinjiang [XJE-DU2017S003]
- Xinjiang Tianshan Xuesong Project [2018XS28]
- Xinjiang Tianchi Doctoral Project
- Taishan Scholar Project of Shandong Province [ts20190922]
- Key Basic Research Project of Natural Science Foundation of Shandong Province [ZR2019ZD51]
High surface area, good conductivity, and high mechanical strength are important for carbon nanofiber fabrics (CNFs) as high-performance supercapacitor electrodes. However, it remains a big challenge because of the trade-off between the strong and continuous conductive network and a well-developed porous structure. Herein, we report a simple strategy to integrate these properties into the electrospun CNFs by adding graphene quantum dots (GQDs). The uniformly embedded GQDs play a crucial bifunctional role in constructing an entire reinforcing phase and conductive network. Compared with the pure CNF, the GQD-reinforced activated CNF exhibits a greatly enlarged surface area from 140 to 2032 m(2) g(-1) as well as a significantly improved conductivity and strength of 5.5 and 2.5 times, respectively. The mechanism of the robust reinforcing effect is deeply investigated. As a freestanding supercapacitor electrode, the fabric performs a high capacitance of 335 F g(-1) at 1 A g(-1) and extremely high capacitance retentions of 77% at 100 A g(-1) and 45% at 500 A g'. Importantly, the symmetric device can be charged to 80% capacitance within only 2.2 s, showing great potential for high-power startup supplies.
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