MnxOyCo3O4石墨烯复合材双电催化体系的构建及性能研究.docx

北京化工大学硕士学位论文活性优于C030VNGO，并且相比于C0304／NGO，中间产物过氧化氢产率 北京化工大学硕士学位论文 活性优于C030VNGO，并且相比于C0304／NGO，中间产物过氧化氢产率 大大减少，耐久性也得到提高。控制两相氧化物的比例，当Mn304／C0304 为20％时，材料活性最佳，其半波电位为0．785V，H202产率为6．45％。 通过XPS分析，发现C0304与石墨烯载体，Mn304与C0304均存在界面 协同作用。石墨烯复合双金属氧化物复合材料的优秀电化学性能与其相界 面产生的协同作用密切相关。 关键词： 氧气还原，氧化石墨烯，双金属氧化物，担载结构，协同作用 万方数据 摘要M毗q—C0304／GRAPHENE 摘要 M毗q—C0304／GRAPHENE COMPOSITE：CONSTRUCTION AND STUDY OF DUAL ELECTROCATAI YST SYSTEM FOR oXYGEN REDUCTION REACTION ABSTRACT Here we employed graphene oxide(GO)which synthesized by a modified Hummers method as carbon support for C0304．The C0304 nanoparticles were successfully loaded on the surface of GO through precipitation．In order to improve the crystallinity of C0304 and to complete the nitrogen doping process in GO matrix in the same time，the as-synthesized C0304／GO was treated by a hydrothermal in the presence of ammonia and turned into C030dNGO．By controlling the temperature of hydrothermal process and monitoring the changes in phrase structure and morphology of C0304 and the N doping and also analyzing their ORR caml”ic activity．The C0304／NGO with the most excellent electro-activity was synthesized at hydrothermal temperature of 1 500C and with the loading of C0304 to be l OOwt．％The results show that the electro-activity of these hybrid material is related to the 万方数据 万方数据 万方数据 北京化工大学硕士学位论文loading 北京化工大学硕士学位论文 loading of C0304 especially related to the C一0一Co bonds． Mn304 has been proved to a good chemical catalyst towards decomposition of hydrogen peroxide and is more stable．Base on this，a novel ternary composite composed of C0304，Mn304 and N-doped graphene oxide has been developed，XRD result proved these three phase to be pure．The STEM results revealed that Mn304 nanocrystals had been successfully epitaxially deposited onto the surface of C0304 nanoparticles and the formed Mn304一on-C0304 nanostructrures were well dispersed on the surface of the graphene oxide．The reason for Mn304 to preferably epitaxially growing on the surface of C030