石墨烯二氧化锰的制备及其电催化氧化性能研究.docVIP

重庆大学本科学生毕业设计（论文） 石墨烯/二氧化锰的制备及其电催化 氧化性能研究 学 生：万梦 学 号 指导教师：刘成伦 专 业：应用化学 重庆大学化学化工学院 二〇一五年六月 Graduation Design(Thesis) of Chongqing University The preparation and electrochemical catalytic properties research of Graphene/MnO2 Undergraduate: Wan Meng Supervisor: Prof. Liu Chenglun Major: Applied Chemistry College of Chemistry and Chemical Engineering Chongqing University June 2015  摘要 。 本文通过氧化还原MnO2，并通过浸渍法制备石墨烯RGO）/MnO2复合材料。XRD和SEM复合材料的组成和形貌，并以苯酚溶液模拟污染物，通过循环伏安和差分脉冲复合材料的电催化。的，石墨烯掺杂量和还原时间对的影响。 实验结果，石墨烯掺杂量，的电催化活性先，15wt%的石墨烯时，的电催化活性最好，通过差分脉冲法检测，电解液100mg/L的苯酚溶液，其峰值电流相比于MnO2提高了54%，其电荷转移电阻降低了73%。复合材料时，以氨水2h时合成的具有的电催化活性，其电荷转移电阻比还原的复合材料的降低了85%，比还原4h的降低了20%。XRD检测结果表明制备的复合材中MnO2为纯度较高、晶型比较单一、结晶度比较好的ε-MnO2。SEM结果表明制备的复合材料中MnO2在石墨烯片层上生长，呈层片状分布。循环伏安结果表明，扫描速度增加，峰值电流增加，峰值电流与扫描速线性关系，电催化氧化苯酚为扩散控制过程。 关键词：苯酚、、电催化电化学交流阻抗、XRD  ABSTRACT With increasing of urban population and increasing urban waste, waste leachate treatment has become a big problem to environmental governance, through electrochemical method can efficiently loading out most of the garbage leachate pollutants. MnO2 was prepared through oxidation-reduction method，and MnO2 doped with graphene was prepared by impregnation. The electrocatalytic activity of MnO2 was enhanced by doping grapheme. The composition and morphology was determined by XRD and SEM, respectively. The electrocatalytic activity of grapheme/MnO2 to phenol was tested through cyclic voltammetry and differential pulse method. The preparation conditions of composite materials was optimized, and the influences of the amount of grapnene and the reduction times on the electrocatalytic activity of grapheme/MnO2. The results indicated with the increment of graphene amount, the electrocatalytic activity of grapheme/MnO2 was enhanced first, and then was reduced.When the graphene amount was 15wt%, the electrocatalytic activity of grapheme/MnO2 was most. Compared with MnO2, the peak current was 54% more th