Influence of KOH/Coke Mass Ratio on Properties of Activated Carbons Made by Microwave-Assisted Activation for Electric Double-Layer Capacitors
Influence of KOH/Coke Mass Ratio on Properties of Activated Carbons Made by Microwave-Assisted Activation for Electric Double-Layer Capacitors
复制标题
KOH/焦炭质量比对双电层电容器微波辅助活化活性炭性能的影响
DOI：
10.1021/ef100228b
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发表时间：
2010-06-01
期刊：
影响因子：
5.3
通讯作者：
Shui, Hengfu
中科院分区：
文献类型：
--
作者：
He, Xiaojun;Geng, Yejing;Shui, Hengfu
以KOH为活化剂，对石油焦进行微波活化制备活性炭，作为双层电电容器的电极材料。利用傅里叶变换红外光谱和氮吸附技术对活性炭的孔隙结构和官能团进行了表征。结果表明：随着KOH/焦炭质量比的增大，活性炭的比表面积（SBET）和总孔容（Vt）均达到最大值；在KOH/焦炭质量比为5:1时，微波辅助活化的AC（记为AC5/1）的SBET为2312 m2 g−1，Vt为1.13 m3 g−1，而传统活化的AC的SBET仅为532 m2 g−1，Vt为0.24 m3 g−1。微波辅助KOH活化工艺可使石油焦的KOH/焦炭比由3:1提高到5:1，从而形成并扩大微孔。然而，当KOH/焦炭比为6:1时，一些微孔被破坏。AC5/1电极的比电容r…
Activated carbons (ACs) are obtained by microwave-assisted activation of petroleum coke with KOH as an activation agent and used as electrode materials for electric double-layer capacitors. The pore structure and functional groups of ACs are characterized by Fourier transform infrared spectroscopy and the nitrogen adsorption technique. The results show that both the specific surface area (SBET) and the total pore volume (Vt) of ACs go through a maximum as the KOH/coke mass ratio increases. At 5:1 of the KOH/coke mass ratio, SBET of AC (denoted as AC5/1) made by microwave-assisted activation is 2312 m2 g−1, with Vt of 1.13 m3 g−1, while SBET of AC made by conventional activation is only 532 m2 g−1, with Vt being at 0.24 m3 g−1. The microwave-assisted KOH activation process is capable of creating and enlarging micropores of petroleum coke by increasing the KOH/coke ratio from 3:1 to 5:1. Nevertheless, some micropores are destroyed when the KOH/coke ratio is 6:1. The specific capacitance of AC5/1 electrode r...