Pseudocapacitance Effects for Enhancement of Capacitor Performance

✍ Scribed by G. Lota; E. Frackowiak

• Book ID: 102217053
• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 322 KB
• Volume: 10
• Category: Article
• ISSN: 1615-6846
• DOI: 10.1002/fuce.201000032

✦ Synopsis

Abstract

We report on the pseudo‐capacitance induced by a nitrogen substituted in the carbon network composite prepared by a simple carbonisation (750 °C) of formaldehyde and melamine in the presence of carbon nanotubes. Nitrogen content in the composites varied from 7.4 to 21.7 wt.%. Such materials have a higher density than activated carbons, hence, they can supply better volumetric capacity. N‐rich composites show an excellent charge propagation at current loads from 500 mA g^–1^ to 50 A g^–1^ because of multiwalled nanotubes which play a conducting as well as a supporting role. The electrochemical performance of various composites was investigated in two‐ and three‐electrode cells using acidic (1 mol L^–1^ H~2~SO~4~), alkaline (6 mol L^–1^KOH), neutral (1 mol L^–1^ Na~2~SO~4~) and organic electrolytes (1 mol L^–1^ TEABF~4~ in acetonitrile). Organic and neutral medium is not adapted for N‐rich carbon electrodes of supercapacitor. The detailed electrochemical characterisation pointed out the differences of charge propagation of electrodes with the different polarity.