稀土Ce掺杂纳米晶Mn-Mo-Ce氧化物阳极及其选择电催化性能

发布时间：2018-01-05 21:14

  本文关键词：稀土Ce掺杂纳米晶Mn-Mo-Ce氧化物阳极及其选择电催化性能　出处：《材料工程》2017年09期 　论文类型：期刊论文

  更多相关文章： Mn-Mo-Ce氧化物 稀土掺杂 阳极电沉积 选择电催化

【摘要】：采用阳极电沉积技术制备纳米晶Mn-Mo-Ce氧化物阳极,利用SEM,EDS,XRD,HRTEM,电化学等检测技术及析氧效率测试方法研究氧化物阳极的纳米结构和选择电催化性能,探讨析氧抑氯选择电催化的机理。结果表明:少量Ce掺杂获得了具有网孔状纳米结构的Mn-Mo-Ce氧化物阳极,该阳极在海水中具有99.51%析氧效率的高效选择电催化性能。由于γ-MnO2结构特性优先吸附OH-,抑制Cl-吸附,OH-在Mn4+/Mn3+变价电催化作用下完成析氧,实现选择电催化过程;Ce掺杂增加反应活性,促进吸附与放电过程;活性(100)晶面的晶面间距增大促进OH-的流动和新生O2的逸出,从纳米形貌效应上实现高效析氧抑氯选择电催化性能。
[Abstract]:Nanocrystalline Mn-Mo-Ce oxide anode was prepared by anodic electrodeposition technique. Electrochemical techniques and oxygen evolution efficiency measurements were used to study the nanostructures and selective electrocatalytic properties of oxide anodes. The mechanism of selective electrocatalysis for oxygen evolution and chlorine suppression was discussed. The results showed that the Mn-Mo-Ce oxide anode with mesh-like nano-structure was obtained by a small amount of ce doping. The anode has a high selective electrocatalysis performance of 99.51% oxygen evolution efficiency in seawater. Because of the structure characteristic of 纬 -MnO2, the adsorption of OH-is preferred and Cl-adsorption is inhibited. Under the action of Mn4 / Mn3 variable valence electrocatalysis, OH- completes the oxygen evolution and realizes the selective electrocatalytic process. Ce doping increases the reaction activity and promotes the adsorption and discharge process. The increase of the interfacial spacing between the two surfaces promotes the flow of OH- and the escape of new O _ 2, and the selective electrocatalytic activity of oxygen evolution and chlorine suppression is realized from the effect of nano-morphology.
【作者单位】： 辽宁石油化工大学机械工程学院;
【基金】：国家自然科学基金资助项目(21171083) 辽宁省教育厅一般项目资助项目(L2013154)
【分类号】：O646.542;TB383.1
【正文快照】： 电解海水氢能开发应用中,最理想的析氧抑氯阳极材料是过渡族元素Mn的二元或三元复合氧化物,其中以阳极沉积制备的γ-MnO2物相结构Mn-Mo氧化物及其基础上开发的Mn-Mo-Fe,Mn-Mo-V等氧化物最为成熟,在碱性海水介质中具有95%以上析氧的高效选择电催化性能[1-3]。Mn系氧化物由于其，

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