二氧化锰 聚合物复合材料的循环伏安法制备及性能研究-物理化学专业论文.docx

表明二氧化锰-聚吡咯材料具有良好的循环稳定性。氧还原电测试显示二氧化锰-聚吡咯 电极具有对氧气还原较高的催化性。 关键词：循环伏安 复合电极 二氧化锰 导电聚合物 比电容 氧气还原反应 Abstract As an important electrode material, owing to its such unique properties as low price, large specific area, resource abundance, environmental friendliness, steady electrochemical characteristic, high specific capacitance and excellent reversibility, manganese dioxide has been extensively utilized in neutral zinc, primary and secondary alkaline, as well as lithium/manganese cells. Whereas because of its inferior electrochemical activity, MnO2 resource runs out gradually, therefore chemists are focusing on the modification of MnO2 electrode material. In this thesis, on the basis of manganese dioxide preparation through CV technique, the influence of scan rate on the obtained manganese dioxide was discussed. The difference of deposition method of manganese dioxide was compared. The doped effect of manganese dioxide with two typical electronically conducting polymers (ECPs): PANI (polyaniline) and PPy (polypyrrole) was investigated. And we reach major results and conclusions below. 1、Manganese dioxide was successfully deposited on a graphite substrate at room temperature via CV (cyclic voltammetry). The number of electron transferred was calculated according to the results of cyclic voltammograms at different scan rates and diffusivity value of Mn(Ⅱ). The EC (electrochemical-chemical) reaction mechanism of MnO2-deposition on a graphite electrode was inferred, basically in accordance with literature. Results obtained from electrochemical techniques demonstrate that the area-based specific capacitance of this composite decreases with scan rate. This material has excellent charge-storage ability and good electrocatalysis for ORR (oxygen reduction reaction). And for the first time, the dynamic model of catalysis for ORR was established. 2、Manganese dioxide was successfully deposited on a graphite substrate at room temperature via various electrochemic