Electrochemical properties of bamboo-shaped multiwalled carbon nanotubes generated by solid state pyrolysis
Electrochemical properties of bamboo-shaped multiwalled carbon nanotubes generated by solid state pyrolysis
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DOI：
10.1016/j.elecom.2006.05.001
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发表时间：
2006-07
影响因子：
5.4
通讯作者：
S. Shanmugam;A. Gedanken
中科院分区：
文献类型：
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作者：
S. Shanmugam;A. Gedanken
本文报道了一种简单有效的固相热解法合成的竹节状多壁碳纳米管的电化学研究。循环伏安法用于评估BWCNT在含有5 mM K4 Fe（CN）6的0.1M KCl中的电化学行为。对所合成的竹节状多壁碳纳米管和商用中空多壁碳纳米管的电子转移速率进行了评价和比较。在所研究的电极中，BMWCNTs显示出更快的电子转移速率，与其他电极相比。较高的电子转移动力学可以归因于表面氧化物官能团。红外光谱、拉曼光谱、X射线光电子能谱和电化学研究表明，合成的碳纳米管表面含有官能团。这种现象可以归因于在所制备的BMWCNTs中，与普通的多壁碳纳米管相比，暴露的边缘平面的量更大。采用循环伏安法研究了BMWCNTs电极在1 M KNO 3溶液中的电容性能，扫描速率为25 ~ 500 mV/s。当扫描速率为25和500 mV/s时，BMWCNTs电极的比电容分别为11.5和6.7F/g。
We report herein on an electrochemical study of bamboo-shaped multiwalled carbon nanotubes (BMWCNTs) that were synthesized by a simple and efficient solid state pyrolysis method. Cyclic voltammetry was used to evaluate the electrochemical behavior of BWCNTs in 0.1M KCl containing 5mM of K4Fe(CN)6. The electron transfer rates of as-synthesized bamboo-shaped multiwalled carbon nanotubes and commercial hollow multiwalled CNTs were evaluated and compared. Among the studied electrodes, BMWCNTs showed a faster electron transfer rate, as compared with the other electrodes. The higher electron transfer kinetics can be attributed to the surface oxide functional groups. IR, Raman, XPS, and electrochemical studies showed that the as-synthesized carbon nanotubes exhibit some functional groups on BMWCNTs. This phenomenon can be attributed to the larger amount of exposed edge planes in the as-prepared BMWCNTs, as compared with the ordinary multiwalled carbon nanotubes. The capacitive properties of BMWCNTs electrodes were studied in 1M KNO3using cyclic voltammetry with the scan rates ranging from 25 to 500mV/s. The specific capacitance of the BMWCNTs electrodes were 11.5 and 6.7F/g with scan rates of 25 and 500mV/s, respectively.