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Hierarchically Designed Three‐Dimensional Macro/Mesoporous Carbon Frameworks for Advanced Electrochemical Capacitance Storage
Author(s) -
Yang Yanbing,
Li Peixu,
Wu Shiting,
Li Xinyang,
Shi Enzheng,
Shen Qicang,
Wu Dehai,
Xu Wenjing,
Cao Anyuan,
Yuan Quan
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201406199
Subject(s) - materials science , supercapacitor , mesoporous material , nanotechnology , carbon nanotube , chemical vapor deposition , capacitance , nanoparticle , electrode , chemical engineering , chemistry , engineering , biochemistry , catalysis
Mesoporous carbon (m‐C) has potential applications as porous electrodes for electrochemical energy storage, but its applications have been severely limited by the inherent fragility and low electrical conductivity. A rational strategy is presented to construct m‐C into hierarchical porous structures with high flexibility by using a carbon nanotube (CNT) sponge as a three‐dimensional template, and grafting Pt nanoparticles at the m‐C surface. This method involves several controllable steps including solution deposition of a mesoporous silica (m‐SiO 2 ) layer onto CNTs, chemical vapor deposition of acetylene, and etching of m‐SiO 2 , resulting in a CNT@m‐C core–shell or a CNT@m‐C@Pt core–shell hybrid structure after Pt adsorption. The underlying CNT network provides a robust yet flexible support and a high electrical conductivity, whereas the m‐C provides large surface area, and the Pt nanoparticles improves interfacial electron and ion diffusion. Consequently, specific capacitances of 203 and 311 F g −1 have been achieved in these CNT@m‐C and CNT@m‐C@Pt sponges as supercapacitor electrodes, respectively, which can retain 96 % of original capacitance under large degree compression.