细乳液法制备MnO2/PPy复合材料及其电化学性能

以吡咯(Py)、高锰酸钾(KMnO₄)等为原料,撞击流-旋转填料床(IS-RPB)为乳化设备,通过细乳液法(W/O)制备了类球形花状结构的MnO₂/PPy复合材料。研究了对甲苯磺酸浓度、高锰酸钾浓度和反应时间对MnO₂/PPy复合材料比容量的影响,并对其电化学性能进行了考察。研究结果表明,细乳液法制备MnO₂/PPy复合材料适宜条件为对甲苯磺酸浓度0.84mol/L、高锰酸钾浓度0.094mol/L及反应时间3.5h。该条件下制备的MnO₂/PPy复合材料比表面积为177.1m²/g,比容量在0.5A/g时达到231.9F/g。同时,也表明MnO₂与PPy的协同作用有效提高了MnO₂/PPy的比容量和循环稳定性。

Synthesis of MnO2/PPy composite materials by miniemulsion polymerization and its electrochemical performances

The MnO₂/PPy composite materials were prepared by miniemulsion method (W/O) with Py and KMnO₄ as raw materials, which obtained spherical floral structure. The impinging stream-rotating packed bed (IS-RPB) was selected as an emulsion equipment to prepare miniemulsion. The concentration of p-toluenesulfonic acid, concentration of potassium permanganate and reaction time on the specific capacitance of MnO₂/PPy composite materials were studied. And the electrochemical performances were investigated also. The results showed that the optimum conditions of synthesis MnO₂/PPy composite materials by miniemulsion polymerization were concentration of p-toluenesulfonic acid of 0.84mol/L, concentration of potassium permanganate of 0.094mol/L and reaction time of 3.5h. Under the suitable operating conditions, the specific surface area of MnO₂/PPy composite materials was 177.1m²/g and the specific capacitance was 231.9F/g at 0.5A/g. The specific capacitance and cycle stability of MnO₂/PPy electrode were enhanced due to synergistic effect between MnO₂ and PPy.