Journal
MATERIALS LETTERS
Volume 88, Issue -, Pages 30-32Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2012.08.046
Keywords
Carbon materials; Spheres; Porous materials; Fast mass transfer; Electrochemical double layer capacitor
Funding
- National Nature Science Funds of China [21075091, 21001085]
- Fundamental Research Funds for the Central Universities [114027, 111083]
- Large-Scale Instrument and Equipment Sharing Foundation of Wuhan University [LF20110068]
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A porous carbon sphere (PCS), which exhibits hierarchical macro/meso/microporosity, is fabricated by nanocasting. The macropores within the PCS are penetrable, fully open and well interconnected, which is admirable for fast mass transfer applications. The carbon has been attempted as a novel electrode material for a fast rechargeable electrochemical double layer capacitor (EDLC). Though the total surface area is only 826 (+/-2) m(2) g(-1) and a large quantity of micropores exist, the capacitance of the EDLC can reach 172 (+/-3) F g(-1) regardless of the cyclic voltammetry scan rate. The macropores within the PCS acted as ion-buffering reservoirs in-situ, which facilitates the accessibility of the mesopores as well as the micropores within the PCS. As a result, unlike traditional microporous carbon material, the micropores in the PCS show no obvious negative effect to the performance of the EDLC. The PCS material is a promising candidate in fast mass transfer applications. (C) 2012 Elsevier B.V. All rights reserved.
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