Li, Peixu Yang, Yanbing Shi, Enzheng Shen, Qicang Shang, Yuanyuan Wu, Shiting Wei, Jinquan Wang, Kunlin Zhu, Hongwei Yuan, Quan Cao, Anyuan Wu, Dehai Core-Double-Shell, Carbon Nanotube@Polypyrrole@MnO<sub>2</sub> Sponge as Freestanding, Compressible Supercapacitor Electrode Design 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–MnO<sub>2</sub> structure shows higher capacitance than the CNT–MnO<sub>2</sub>–PPy sequence. Our porous core-double-shell sponges can serve as freestanding, compressible electrodes for various energy devices. shell sequence;cycling stability;conductive skeleton;surface area;supercapacitor performance;supercapacitor electrode;metal oxide layer;energy applications;compressible electrodes;polymer layer;mechanism study;CNT;energy devices;capacitance;electrochemical properties;components form;carbon nanotube;optimized electrode materials;Compressible Supercapacitor ElectrodeDesign;bulk electrode 2014-04-09
    https://acs.figshare.com/articles/journal_contribution/Core_Double_Shell_Carbon_Nanotube_Polypyrrole_MnO_sub_2_sub_Sponge_as_Freestanding_Compressible_Supercapacitor_Electrode/2307010
10.1021/am500579c.s001