Stability of multi-wall carbon nanotubes in air

✍ Scribed by Shuang-mei Zhu; Jun-qing Li; Jin-hui Pang; Hua-shun Zhang; Er-jun Liang

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 40 KB
• Volume: 49
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/j.carbon.2010.08.022

✦ Synopsis

Two kinds of mesophase pitches with different softening points were prepared at different soaking times and directly activated with KOH to study the effects of the softening point on the textural characteristics of the resulting activated carbons and their behavior as electrodes in capacitors. Results show that the softening points of the two mesophase pitches are 280 and 330 °C, and the specific surface areas of the activated carbons are 1337 and 1300 m 2 g À1 , respectively. The specific capacitance of the higher softening point mesophase pitch-derived carbon is higher (255.6 F g À1 ) than that of the lower softening point mesophase pitch-derived carbon (190.8 F g À1 ) at the same current density. Cyclic voltammograms show that the lower softening point mesophase pitch-derived carbon exhibits better rectangularshaped i-V curves. The softening points of the mesophase pitches prepared from even the same precursor can significantly affect the electrochemical performance of the resulting activated carbons.