氯化锌活化对炭气凝胶微球的结构与电化学性能的影响

对炭气凝胶微球在高温下进行氯化锌活化改性,并用于制作超级电容器的电极。采用扫描电镜、N2物理吸附-脱附等对炭气凝胶微球的形貌结构进行表征,采用循环伏安、恒流充放电等测定了材料的电化学性能。结果表明,氯化锌活化有效地改善了炭气凝胶微球的孔结构,通过增加炭气凝胶微球的微孔面积和体积,提高了材料的比表面积和孔隙率。经过氯化锌活化,炭气凝胶微球的电化学性能也随之得到提高,电阻明显减小,比电容提高了2倍以上。

Influence of ZnCl2 Activation on Structure and Electrochemical Performance of Carbon Aerogel Spheres

Carbon aerogel spheres were activated by zinc chloride (ZnCl₂), and the activated products were made into the electrodes of supercapacitor. The pore structure of carbon aerogel spheres was investigated by SEM and N₂ adsorption. The electrochemical properties were tested by cyclic voltammetry (CV), AC impedance and constant current charge/discharge methods. The experimental results showed that the pore structure of carbon aerogel spheres was improved after ZnCl₂ activation, then the surface area and porosity were increased through the increasing of micropore surface area and volume. Consequently the capacitance properties of the prepared electrodes were enhanced, the resistance decreased and the capacitance were increased twice.