聚乙撑二氧噻吩/二氧化锰纳米复合物的界面聚合制备及其电化学性能

采用界面聚合法制备聚3,4-乙撑二氧噻吩/二氧化锰(PEDOT/MnO2)纳米复合物. 通过红外(IR)光谱、X射线衍射(XRD)、BET比表面积、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对样品进行表征. 结果表明, 产物是具有丰富的多孔孔道结构的无定型纳米材料, 孔径主要分布在5-25 nm范围内, 比表面积可达98 m2·g-1. 同时用循环伏安(CV)、恒流充放电和交流阻抗(EIS)等电化学测试表明, 在0.5 mol·L-1 Na2SO4溶液中, -0.2 - 0.8 V(vs SCE)的电化学窗口下, PEDOT/MnO2纳米复合物显示出良好的电化学性能, 当电流密度为0.5 A·g-1时, 所制备的PEDOT/MnO2单电极比容量达196.3 F·g-1, 500次循环后样品放电比容量保持90%左右.

Electrochemical Properties of Poly(3,4-ethylenedioxythiophene)/ Manganese Oxide Synthesized by Interracial Polymerization

Nanosized poly(3,4-ethylenedioxythiophene)/manganese oxide (PEDOT/MnO2) composite was prepared by an interfacial polymerization method. The structure and morphology of the product was characterized by IR, XRD, BET surface area, SEM, and TEMtechniques. The results showed that the as-prepared amorphous nanocomposite had a porous structure. The pore size was about 5-25 nm and the surface area reached 98 m2·g-1. Electrochemical properties of the PEDOT/MnO2 electrode were determined by cyclic voltammetry (CV), galvanostatic charge/discharge, and electrochemical impedance spectrometry (EIS). The results indicated that the specific capacitance of the PEDOT/MnO2 nanocomposite as a single electrode was 196.3 F·g-1 at a current density of 0.5 A·g-1 in 0.5 mol·L-1 Na2SO4 electrolyte within a potential range of -0.2 - 0.8 V(vs SCE). The capacity retention of the PEDOT/MnO2 electrode was about 90% after 500 cycles.