SiO_(2)模板法制备LaMnO_(3)及其催化性能

Preparation of LaMnO_(3) by SiO_(2) Template Method and Its Catalytic Performance

采用Stober-Frink法由正硅酸乙酯制备出SiO_(2)微球,再将其作为模板剂,采用硬模板法制备LaMnO_(3)。采用X射线衍射(XRD)、场发射扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、N_(2)吸附-脱附等表征手段对制备的LaMnO_(3)进行表征分析,利用循环伏安曲线、线性扫描、蓝电测试等研究手段对其电化学性能及放电性能进行了测试。结果表明:SiO_(2)微球模板可制备出球形空洞的多孔LaMnO_(3),其具有良好的氧还原反应(ORR)活性,比表面积为15.685 m^(2)/g,远大于共沉淀法制备的LaMnO_(3),并作为铝空气电池阴极催化剂材料,相比于共沉淀法制备的LaMnO_(3),其恒流放电稳定、放电电压较高。

SiO_(2) microspheres were prepared from ethyl orthosilicate via Stober-Frink method,and then LaMnO_(3) was prepared by hard template method using it as template.The prepared LaMnO_(3) was characterized and analyzed via X-Ray Diffraction(XRD),Field Emission,Scanning Electron Microscopy(SEM),X-Ray Photoelectron Spectroscopy(XPS),N_(2) adsorption-desorption and other characterization methods,and its electrochemical properties and discharge properties were tested by means of cyclic voltammetry,linear scanning,blue electric test.The results show that porous LaMnO_(3) with spherical cavities can be prepared by silica microsphere template.It shows optimal oxygen reduction reaction(ORR)activity,and its specific surface area is 15.685 m^(2)/g,which is much larger than that of LaMnO_(3) prepared by coprecipitation method.As a cathode catalyst material for aluminum air battery,compared with LaMnO_(3) prepared by coprecipitation method,its constant current discharge is stable and its discharge voltage is higher.