Improving the characteristic of electric double layer capacitors using oxidized carbon nanoballoon
Improving the characteristic of electric double layer capacitors using oxidized carbon nanoballoon
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DOI：
10.1016/j.electacta.2014.01.141
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发表时间：
2014-06
影响因子：
6.6
通讯作者：
Y. Okabe;Y. Suda;H. Tanoue;H. Takikawa;H. Ue;K. Shimizu
中科院分区：
文献类型：
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作者：
Y. Okabe;Y. Suda;H. Tanoue;H. Takikawa;H. Ue;K. Shimizu
碳纳米材料被用作双电层电容器（EDLC）的电极。在本研究中，我们使用电弧黑（AcB）和碳纳米球（CNB）作为电极材料。在N2气氛中对石墨进行电弧放电，生成AcB，并对AcB进行热处理，生成CNB。CNB是石墨状的，并且颗粒形状是中空的。在高扫描速率下，CNB比AcB具有更高的比电容。为了提高双电层电容器的比电容，在空气中在625 °C下氧化CNB。CNB的外壳在氧化过程中产生褶皱。我们称这种物质为氧化CNB（Ox-CNB）。将AcB、CNB和Ox-CNB用于EDLC电极，并与市售活性炭（AC）进行比较。利用电化学测试系统对双电层电容器电极的循环伏安和交流阻抗进行了测试。在500 mV/s的扫描速率下，Ox-CNB的比电容（29 F/g）大于AC的比电容（16 F/g）。此外，作为阻抗测量的结果，Ox-CNB具有高电导率。Ox-CNB是一种性能优良的双电层电容器高倍率充放电电极材料。
Carbon nanomaterials are used as an electrode of electric double layer capacitors (EDLCs). In this research, we used arc black (AcB) and carbon nanoballoon (CNB) as the electrode material. AcB was produced by an arc discharge of graphite in N2atmosphere, and CNB was formed by a heat treatment of AcB. CNB is graphitic, and the particle shape is hollow. CNB has a higher specific capacitance than AcB at a high scan rate. In order to increase the specific capacitance of EDLC, CNB was oxidized at 625 °C in the air. By oxidization, the outer shell of CNB forms wrinkle. We call this material oxidized CNB (Ox-CNB). AcB, CNB, and Ox-CNB were used for the EDLC electrodes and were compared with commercially available activated carbon (AC). Cyclic voltammetry and electrochemical impedance spectroscopy of the EDLC electrodes were measured by an electrochemical measurement system. The specific capacitance of Ox-CNB (29 F/g) was larger than that of AC (16 F/g) at a scan rate of 500 mV/s. Furthermore, Ox-CNB had a high conductivity as a result of impedance measurement. Ox-CNB is an excellent electrode material of EDLC when using at a high charge/discharge rate.