Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 21, Issue 16, Pages 6157-6164Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201406199
Keywords
carbon; nanoparticles; nanotubes; mesoporous materials; platinum
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Funding
- National Nature Science Foundation of China [91127004, 51325202, 21201133, 51272186]
- Fundamental Research Funds for the Central Universities
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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-SiO2) layer onto CNTs, chemical vapor deposition of acetylene, and etching of m-SiO2, 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 311Fg(-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.
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