Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 24, Pages 28433-28441Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c02758
Keywords
carbon nanotube fiber fabric; activation; flexible electrodes; areal capacitance; supercapacitors
Funding
- National Natural Science Foundation of China [51703027]
- Natural Science Foundation of Shanghai [20ZR1402000]
- Innovation Program of Shanghai Municipal Education Commission [2017-01-07-00-03-E00055]
- China Postdoctoral Science Foundation [2017M621322, 2018T110324]
- Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University [CUSF-DH-D-2020044]
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A new type of carbon nanotube fiber fabric (CNTFF) activated by a simple thermal oxidation and acid treatment process exhibits exceptional capacitance performance and cycle life. The constructed flexible solid-state supercapacitor shows high energy density, power density, rate performance, and cycle stability, offering a new opportunity for flexible energy storage.
Owing to their features of excellent mechanical flexibility, high conductivity, and light weight, carbon-based fiber fabrics (CBFFs) are highly attractive as flexible electrodes for flexible solid-state supercapacitors (SCs). However, the achieved areal capacitance of most CBFFs is still unsatisfactory. Carbon nanotube fiber fabric (CNTFF) is a new kind of CBFF and could provide a potential alternative to high-performance flexible electrodes. Herein, we report the activation of CNTFF using a facile thermal oxidation and acid treatment process. The activated CNTFF shows an exceptional combination of large areal capacitance (1988 mF cm(-2) at 2 mA cm(-2)), excellent rate performance (45% capacitance reservation at 100 mA cm(-2)), and outstanding cycle life (only 3% capacitance decay after 10,000 cycles). The constructed solid-state SC reaches a maximum energy density of 143 mu Wh cm(-2) at 1000 mu W cm(-2) and a maximum power density of 30,600 mu W cm(-2) at 82 mu Wh cm(-2). Additionally, this device possesses good rate performance along with superb cycle stability and excellent mechanical flexibility under various bending conditions. Our present work therefore offers a new opportunity in developing high-performance flexible electrodes for flexible energy storage.
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