Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201806329
Keywords
anode; asymmetric supercapacitors; carbon fiber textile; flexible; high-energy
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Funding
- National Natural Science Foundation of China [21822509, 31530009]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2014A030306048]
- Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program [2015TQ01C205]
- Pearl River Nova Program of Guangzhou [201610010080]
- Fundamental Research Funds for the Central Universities [17lgzd16]
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The exploration of high-energy anodes with good mechanical properties is highly attractive for flexible asymmetric supercapacitors (ASCs) but challenging. Owing to the excellent conductivity and superior mechanical flexibility, carbon fiber textile (CFT) holds great promise as a substrate/current-collector for fabricating flexible electrodes. Yet, it is rarely used as a flexible active electrode in terms of its low electrochemical reactivity and small accessible area. In this work, an effective surface and structural modulation strategy is developed to directly tune CFT into a highly active anode for flexible ASCs by creating hierarchical pores and numerous pseudocapacitive oxygenic groups. Arising from large surface and increased active sites, the as-prepared activated porous CFT (APCFT) electrode not only achieves a large capacitance (1.2 F cm(-2) at 4 mA cm(-2)) and fast kinetics but also shows satisfying cycling durability (no capacitance decay after 25 000 cycles). More importantly, an advanced flexible ASC device with an impressive energy density of 4.70 mWh cm(-3) is successfully assembled by employing this APCFT as an anode, outperforming most recently reported ASC devices. This dual modification strategy may throw light on the rational design of new generation advanced carbon electrodes for high-performance flexible supercapacitors.
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