CNTs/PPy/MnO_2复合材料的制备及电容性能的研究

Preparation and capacitance performance of CNT/PPy/MnO_2 composites

采用自组装法制备CNT/PPy/MnO_2三元复合材料,利用扫描电子显微镜、X射线衍射、红外光谱对其结构和形貌进行表征,通过循环伏安、恒流充放电及交流阻抗对其电化学电容性能进行了研究,并讨论了不同配比对复合材料的电化学性能的影响。结果表明:CNT/PPy/MnO_2三元复合材料在质量比为m(CNT)∶m(PPy)∶m(MnO_2)=45∶10∶45时,内阻小且具有良好的充放电可逆性,在1 mol/L的Na_2SO_4溶液中,以0.28 A/g电流密度放电时,比电容可达178 F/g。扫描500圈后,电容保持率仍在92%以上,表明具有良好的循环稳定性。

CNT/PPy/MnO2 ternary composite material was prepared by self-assembly method. The structure and morphology of ternary composites were studied by scanning electron microscope（SEM）, X-ray diffraction（XRD） and infrared spectroscopic. The electrochemical capacitance performance of ternary composites was investigated by cyclic voltammetry（CV）, constant current charge-discharge and AC impedance tests. The influence of different ratio on the electrochemical properties of the composite material was discussed. The results indicate that CNT/PPy/MnO2 ternary composites with m（CNT） ∶m（PPy） ∶m（MnO2）=45 ∶10 ∶45 have small internal resistance and high charge-discharge reversibility. The specific capacitance of the ternary composites can reach 178 F/g at current density of 0.28 A/g in 1 mol/L Na2SO4 solution. The electrode exhibits good cycling stability, retaining up to 92% of its initial charge capacitance at 500 th cycle.