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Citation: SHI Zhi-Qiang, CHEN Ming-Ming, ZHAO Shuo, WANG Cheng-Yang. Structure and Electrochemical Capacitive Behavior of Novel Crystallite Carbon[J]. Acta Physico-Chimica Sinica, ;2008, 24(02): 237-242. doi: 10.3866/PKU.WHXB20080210 shu

Structure and Electrochemical Capacitive Behavior of Novel Crystallite Carbon

1.
Key Laboratory for Green Chemical Technology of the Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China

Received Date: 3 August 2007
Available Online: 18 December 2007

A novel crystallite carbon (NCC)was prepared by KOH activation of carbonized petroleumcoke precursors. The porous structure, crystallite structure, and microstructure were characterized by N2 adsorption-desorption, X-ray diffraction (XRD), and high resolution transmission electron microscopy (HRTEM) measurements, respectively. The capacitive behavior of the NCC electrodes was also examined with 1 mol·L-1 tetraethylammonium tetrafluoroborate (Et4NBF4) solution in propylene carbonate (PC). It was found that the NCC was composed of much well-grown graphite-like crystallite with average interlayer spacing (d002) of 0.377 nm. The NCC had lower surface area (130.7 m2·g-1) and more distinct crystal character than activated carbon (AC). The energy storage for the NCC depended on the intercalation of electrolyte ions into graphite-like crystallite layers. The specific capacitance of the NCC was 110.6 F·g-1, showing specific energy of 27.5 Wh·kg-1, specific power of over 1.2 kW·kg-1 and excellent cycle stability. Therefore, the crystallite carbon is a promising candidate for novel electrode material.
- Crystallite carbon; Graphite-like crystallite; Porous structure; Intercalation
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