Hydrothermal assembly of micro-nano-integrated core-sheath carbon fibers for high-performance all-carbon micro-supercapacitors

被引:36
作者
Zhai, Shengli [1 ,2 ]
Karahan, H. Enis [2 ]
Wei, Li [1 ]
Chen, Xuncai [1 ]
Zhou, Zheng [1 ]
Wang, Xin [2 ]
Chen, Yuan [1 ]
机构
[1] Univ Sydney, Sch Chem & Biomol Engn, Sydney, NSW 2006, Australia
[2] Nanyang Technol Univ, Sch Chem & Biomed Engn, 62 Nanyang Dr, Singapore 637459, Singapore
基金
澳大利亚研究理事会;
关键词
Carbon fiber; Supercapacitor; Wearable electronics; Graphene oxide; Carbon nanotube; SOLID-STATE; GRAPHENE FIBER; ENERGY-STORAGE; OXIDE; FABRICATION; ELECTRODES; DEPOSITION; BATTERIES; POLYMER; FILM;
D O I
10.1016/j.ensm.2017.01.004
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Wearable electronic devices (WEDs) require flexible, stable, and long-lasting power sources for their everexpanding functionalities. Fiber-based micro-supercapacitors (FMSCs) are promising power solutions for novel WEDs because of their mechanical flexibility, small size and good integrability. Various porous carbon fibers have been explored as electrodes for FMSCs. However, current FMSCs often show poor rate capability due to modest electrical conductivity in fiber electrodes. Here, we demonstrate the synthesis of a micro-nanointegrated core-sheath fiber comprised of a microscale core made of commercial graphite fibers and a nanoscale hybrid sheath comprised of nitrogen doped graphene oxide sheets and multi-walled carbon nanotubes. The graphite fiber core provides fast electron transfer pathways, while the high surface area nano-hybrid sheath enables efficient capacitive energy storage. The core-sheath fiber achieves more than six times increases in capacitance retention compared to hybrid carbon fibers without the conductive core. Solid-state FMSCs were assembled using the core-sheath fibers as electrodes, which concurrently possess high length capacitance (12.8 mF cm(-1)) and volumetric capacitance (27 F cm(-3)), showing an energy density of 3.75 mWh cm(-3) and a power density of 612 mW cm(-3). Furthermore, multiple FMSCs can be easily assembled into flexible energy storage units with expanded voltage and current windows, demonstrating good potentials for practical applications in WEDs.
引用
收藏
页码:221 / 228
页数:8
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