Carbon nanotube-polypyrrole core-shell sponge and its application as highly compressible supercapacitor electrode
carbon nanotube sponge, polypyrrole, core–shell configuration, compressible electrode, supercapacitor
A carbon nanotube (CNT) sponge contains a three-dimensional conductive nanotube network, and can be used as a porous electrode for various energy devices. We present here a rational strategy to fabricate a unique CNT@polypyrrole (PPy) core–shell sponge, and demonstrate its application as a highly compressible supercapacitor electrode with high performance. A PPy layer with optimal thickness was coated uniformly on individual CNTs and inter-CNT contact points by electrochemical deposition and crosslinking of pyrrole monomers, resulting in a core–shell configuration. The PPy coating significantly improves specific capacitance of the CNT sponge to above 300 F/g, and simultaneously reinforces the porous structure to achieve better strength and fully elastic structural recovery after compression. The CNT@PPy sponge can sustain 1,000 compression cycles at a strain of 50% while maintaining a stable capacitance (> 90% of initial value). Our CNT@PPy core–shell sponges with a highly porous network structure may serve as compressible, robust electrodes for supercapacitors and many other energy devices.
Tsinghua University Press
Peixu Li,Enzheng Shi,Yanbing Yang,Yuanyuan Shang,Qingyu Peng,Shiting Wu,Jinquan Wei,Kunlin Wang,Hongwei Zhu,Quan Yuan,Anyuan Cao,Dehai Wu, Carbon nanotube-polypyrrole core-shell sponge and its application as highly compressible supercapacitor electrode. NanoRes.2014, 7(2): 209–218