稻壳多孔碳材料的电容性能及模型计算

采用NaOH和H₃PO₄化学活化法, 由廉价的稻壳制备了2种高比表面积的介孔活性碳, 测试了其比表面积和平均孔径, 利用循环伏安、 恒流充放电和交流阻抗测试了其电化学性能, 其比电容分别达到145.8和168.5 F/g. 利用一种多分支的三级孔道模型对其进行交流阻抗谱拟合, 拟合结果符合度较高, 表明该模型对分析活性碳电极结构有一定指导意义.

Capacitance Performance and Model Analysis of Activated Carbon Derived from Rice Husks

Two mesoporous activated carbons with high surface area were prepared by NaOH or H3PO4 as activation agent and cheap rice husks as precursors. Their specific areas, pore parameters and electrochemical performances were characterized by nitrogen adsorption, cyclic voltammetric method, galvanostatic chronopotentiometry and electrochemical impedance spectroscopy. The capacitance of activated carbons using NaOH or H3PO4 as activation agent can be 145.8 and 168.5 F/g, respectively. The simulation of electrochemical impedance was carried out to characterize the impedance spectrum of activated carbons by a triple pore structure model of electrochemical double-layer capacitor with branch pore structure. The simulation results show that the new model is highly fit in with the actual structure.