具有光电活性的MoO_(2)纳米粒子的制备与表征

Preparation and characterization of MoO_(2) nanoparticles with photoelectric activity

目的通过水热法制备形貌规整、粒径均一、且具有光催化活性的MoO_(2)纳米粒子。方法通过水热处理(NH_(4))_(2)Mo_(4)O_(13)悬浊液制备单斜相MoO_(2)纳米粒子,用XRD,FE-SEM,Raman,EDX,XPS及UV-vis DRS等分析手段对样品的物相、形貌和化学组成进行表征测试,探究反应温度、反应时间对制备MoO_(2)纳米粒子晶相和形貌的影响。结果在190℃下水热处理(NH_(4))_(2)Mo_(4)O_(13)悬浊液20 h,可制得分散性较好、平均粒径约50 nm的MoO_(2)纳米粒子。通过模拟阳光下分解水评估了制备的MoO_(2)纳米粒子作为光催化剂的光电化学性能,结果显示其产生的光电流密度及产氢量分别为21.7μA/cm^(2)和161.9μmol/(h·g)。结论制备的MoO_(2)纳米粒子具有优异的可视光催化性能。

Purposes—To prepare MoO_(2) nanoparticles with regular morphology,uniform particle size and photocatalytic activity by hydrothermal method.Methods—The monoclinic MoO_(2) nanoparticles were prepared by hydrothermally treating a(NH_(4))_(2)Mo_(4)O_(13) suspension.The phase,morphology and chemical composition of the samples were characterized by XRD,FE-SEM,Raman,EDX,XPS and UV-vis DRS.The effects of reaction temperature and reaction time on the crystal phase and morphology of MoO_(2) nanoparticles were investigated.Result—The MoO_(2) nanoparticles with good dispersibility and average particle size of about 50 nm were prepared by hydrothermally treating a(NH_(4))_(2)Mo_(4)O_(13) suspension for 20 h at 190℃.The photoelectrochemical properties of the MoO_(2) nanoparticles as photocatalysts were evaluated by splitting water under simulating sunlight.The photocurrent density and amounts of H_(2) evolved by the MoO_(2) nanoparticles were 21.7μA/cm^(2) and 161.9μmol/(h·g),respectively.Conclusion—The prepared MoO_(2) nanoparticles have excellent visible photocatalytic properties.