MnO_2/SMWCNT/PANI三元复合材料的合成及其电化学电容性能

Synthesis and Electrochemical Capacity of MnO_2/SMWCNT/PANI Ternary Composites

用液相沉淀法制备了二氧化锰/酸化多壁碳纳米管(MnO2/SMWCNT)和二氧化锰/酸化多壁碳纳米管/聚苯胺(MnO2/SMWCNT/PANI)电极材料。通过循环伏安、恒电流充放电等方法测试了样品的电化学性能。结果表明,当MnO2:SMWCNT:PANI的质量比为1:1:0.4时,它的电化学性能最好,在0.1 A/g电流密度下的比电容为318.6 F/g,氧化电流为6.02 A/g,循环100次后电流保持率保持在92.7%。

Binary MnO2/acidified multi-walled carbon nanotube （SMWCNT） and ternary MnO2/SMWCNT/poly- aniline （PANI） composites were prepared by liquid-phase precipitation method. SEM images show that the mor- phology of the materials presents a typical porous structure. The electrochemical capacitive performance of the prepared samples in 0.1 mol/LKESO4 solution was investigated by cyclic voltammetry and galvanostatic charge/discharge tests. The binary MnOE/SMWCNT composites exhibits improved capacitance compared with the SMWCNT. Further, the ternary MnOE/SMWCNT/PANI composites display quasi-rectangular voltammogram shapes and high capacitor properties. The sample with the mass ratio of MnOE：SMWCNT：PANI=1：1：0.4 displays the best performance in all electrode materials. The specific capacitance of the sample reaches 318.6 F/g at the cur- rent density of 0.1 A/g, and its oxidation current density reaches 6.02 A/g. 92.7% current value is maintained after 100 cycles. The high electrochemical capacitors of the ternary MnOE/SMWCNT/PANI composites may be ascribed to their porous morphological structure and well-dispersed MnO2 particles on SMWCNT and PANI.