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以脱脂棉为碳源,氯化锰为前驱物,采用碳辅助法制备了粒径约为65 nm的Mn_3O_4纳米颗粒。通过透射电镜(TEM)和高倍透射电镜(HRTEM)对制备样品的形貌、粒径及晶面的结构特性进行了分析;通过X射线衍射(XRD)表征,分别对不同煅烧温度(400~600℃)下样品的物相、晶粒度进行了研究,表明500℃为Mn_3O_4纳米颗粒的最佳制备温度;X射线光电子能谱(XPS)表征表明制备的Mn_3O_4表面存在碳元素,N2吸附-脱附曲线测试结果表明Mn_3O_4纳米颗粒具有较大的比表面积。另外,通过紫外-可见光(UV-vis)吸收表征表明,在一定的波长范围内该Mn_3O_4纳米颗粒的可见光吸收能力明显增强,有利于提升其光解水制氢能力。
Taking cotton wool as carbon source and manganese chloride as precursors, Mn_3O_4 nanoparticles with a diameter of about 65 nm were prepared by carbon-assisted method. The morphology, particle size and crystal structure of the prepared samples were characterized by transmission electron microscopy (TEM) and high-power transmission electron microscopy (HRTEM). The XRD patterns were characterized by X-ray diffraction (XRD) ℃). The results show that the optimum preparation temperature of Mn_3O_4 nanoparticles is 500 ℃. XPS (X-ray photoelectron spectroscopy) shows that there are carbon elements and N2 adsorption-desorption on the surface of Mn_3O_4. The attached curve test results show that the Mn 3 O 4 nanoparticles have a large specific surface area. In addition, the UV-vis absorption characterization shows that the visible light absorption ability of the Mn_3O_4 nanoparticles is obviously enhanced in a certain wavelength range, which is beneficial to enhance the hydrogen production ability of the photodissociation water.