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

Nanocrystalline Mn-Mo-Ce Oxide Anode Doped Rare Earth Ce and Its Selective Electro-catalytic Performance

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。

The anode oxide of nanocrystalline Mn-Mo-Ce was prepared by anode electro-deposition technology,and its nanostructure and selective electro-catalytic performance were investigated using the SEM,EDS,XRD,HRTEM,electrochemical technology and oxygen evolution efficiency testing.Furthermore,the selective electro-catalytic mechanism of oxygen evolution and chlorine depression was discussed.The results show that the mesh-like nanostructure Mn-Mo-Ce oxide anode with little cerium doped is obtained,and the oxygen evolution efficiency for the anode in the seawater is99.51%,which means a high efficiency for the selective electro-catalytic for the oxygen evolution.Due to the structural characteristics ofγ-MnO2,the OH-ion is preferentially absorbed,while Cl-absorption is depressed.OH-accomplishes the oxygen evolution process during the valence transition electrocatalysis of Mn^4＋/Mn^3＋,completing the selective electro-catalysis process.Ce doping greatly increases the reaction activity,and promotes the absorption and discharge;the rising interplanar spacing between active（100）crystalline plane promotes OH-motion and the escape of newborn O2,so that the selective electro-catalytic property with high efficient oxygen evolution and chlorine depression is achieved from the nano morphology effect.