Research Article


2011, 4(9): 870–881


Binder-Free Activated Carbon/Carbon Nanotube Paper Electrodes for Use in Supercapacitors

Guanghui Xu1, Chao Zheng1, Qiang Zhang1, Jiaqi Huang1, Mengqiang Zhao1, Jingqi Nie1, Xianghua Wang2, and Fei Wei1()

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1Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China2CNGC Wuzhou Engineering Design and Research Institute, Beijing 100053, China

Keywords: KEYWORDS Supercapacitor, flexible, energy storage, carbon nanotube, activated carbon
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ABSTRACT Novel inexpensive, light, flexible, and even rollup or wearable devices are required for multi-functional portable electronics and developing new versatile and flexible electrode materials as alternatives to the materials used in contemporary batteries and supercapacitors is a key challenge. Here, binder-free activated carbon (AC)/carbon nanotube (CNT) paper electrodes for use in advanced supercapacitors have been fabricated based on low-cost, industrial-grade aligned CNTs. By a two-step shearing strategy, aligned CNTs were dispersed into individual long CNTs, and then 90 wt%–99 wt% of AC powder was incorporated into the CNT pulp and the AC/CNT paper electrode was fabricated by deposition on a filter. The specific capacity, rate performance, and power density of the AC/CNT paper electrode were better than the corresponding values for an AC/acetylene black electrode. The capacity reached a maximum value of 267.6 F/g with a CNT loading of 5 wt%, and the energy density and power density were 22.5 W•h/kg and 7.3 kW/kg at a high current density of 20 A/g. The AC/CNT paper electrode also showed a good cycle performance, with 97.5% of the original capacity retained after 5000 cycles at a scan rate of 200 mV/s. This method affords not only a promising paper-like nanocomposite for use in low-cost and flexible supercapacitors, but also a general way of fabricating multi-functional paper-like CNT-based nanocomposites for use in devices such as flexible lithium ion batteries and solar cells.
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Binder-Free Activated Carbon/Carbon Nanotube Paper Electrodes for Use in Supercapacitors. Nano Res. 2011, 4(9): 870–881

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