活化剂用量对活性碳纳米管电化学容量的影响

Effects of the Activating Agent Dosage on the Electrochemical Capacitance of Activated Carbon Nanotubes

采用KOH为活化剂,通过改变活化剂用量,得到不同活化程度的活性碳纳米管．将这些ACNTs分别作为电极材料应用于电化学超级电容器,经电化学容量性能测试,发现ACNTs的电化学容量随活化剂用量的变化而变化,当mKOH／mCNTs=3时,达到最大值．同时用TEM和HRTEM对ACNTs进行形貌分析,用氮气自动吸附仪测试了ACNTs的比表面积和等温吸附曲线,发现ACNTs的电化学容量随活化剂用量的变化与其BET比表面积有直接关系,其BET比表面积的大小决定其电化学容量的高低．

Different activated carbon nanotubes （ACNTs） were obtained with different activating agent dosages using KOH as the activating agent. All the ACNTs were used as the electrode materials of electrochemical super capacitors and the ACNTs electrochemical capacitances were tested by DC-5C battery testing instrument. The results showed that the ACNTs electrochemical capacitance changed with modifying the mass ratio of KOH and carbon nanotubes （CNTs）, and had a maximum at mKOH/mCNTs=3. At the same time, ACNTs were characterized by TEM, HRTEM and N2 auto adsorber. And the results showed that the relationship between the ACNTs electrochemical capacitance and activating agent dosage was closely correlated with the ACNTs BET specific surface area. Namely, the ACNTs BET specific surface area was important to their electrochemical capacitance.