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Core-Double-Shell, Carbon Nanotube@Polypyrrole@MnO2 Sponge as Freestanding, Compressible Supercapacitor Electrode
journal contribution
posted on 2014-04-09, 00:00 authored by Peixu Li, Yanbing Yang, Enzheng Shi, Qicang Shen, Yuanyuan Shang, Shiting Wu, Jinquan Wei, Kunlin Wang, Hongwei Zhu, Quan Yuan, Anyuan Cao, Dehai WuDesign
and fabrication of structurally optimized electrode materials are
important for many energy applications such as supercapacitors and
batteries. Here, we report a three-component, hierarchical, bulk electrode
with tailored microstructure and electrochemical properties. Our supercapacitor
electrode consists of a three-dimensional carbon nanotube (CNT) network
(also called sponge) as a flexible and conductive skeleton, an intermediate
polymer layer (polypyrrole, PPy) with good interface, and a metal
oxide layer outside providing more surface area. These three components
form a well-defined core-double-shell configuration that is distinct
from simple core-shell or hybrid structures, and the synergistic effect
leads to enhanced supercapacitor performance including high specific
capacitance (even under severe compression) and excellent cycling
stability. The mechanism study reveals that the shell sequence is
a key factor; in our system, the CNT–PPy–MnO2 structure shows higher capacitance than the CNT–MnO2–PPy sequence. Our porous core-double-shell sponges can serve
as freestanding, compressible electrodes for various energy devices.
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shell sequencecycling stabilityconductive skeletonsurface areasupercapacitor performancesupercapacitor electrodemetal oxide layerenergy applicationscompressible electrodespolymer layermechanism studyCNTenergy devicescapacitanceelectrochemical propertiescomponents formcarbon nanotubeoptimized electrode materialsCompressible Supercapacitor ElectrodeDesignbulk electrode
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