金@氧缺陷二氧化钛核壳纳米颗粒的制备及光催化产氢  

Facile Synthesis of Core-Shell Au@H-TiO_2 Nanoparticles for Photocatalytic Hydrogen-Generation

作　　者：寇书芳 封振宇[1] 王春省[1] 杨剑[1] 

机构地区：[1]山东大学化学与化工学院,济南250100

出　　处：《无机化学学报》2017年第8期1390-1396,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21172076);山东省泰山学者基金(No.ts201511004)资助项目

摘　　要：通过水解TiCl_3在金纳米颗粒外表生长TiO_2,然后在Ar/H2气氛中高温煅烧成功地合成了核壳形貌的Au@H-TiO_2缺陷结构。采用XRD、TEM、XPS、UV-Vis测试方法对产物的物相结构、形貌及光吸收能力做了系统的分析。与不存在缺陷态的TiO_2和Au@A-TiO_2相比,Au@H-TiO_2表现出最高的产氢速率,这可以归因于其电荷分离效率的提高和电荷转移阻抗的降低,瞬态光电流测试以及电化学阻抗数据证实了这一结论。这些性能的改进可能与Au@H-TiO_2中的Ti^(3+)自掺杂和Au修饰有关。Gold nanoparticles coated by oxygen-deficient TiO2 （Au@H-TiO2） were successfully synthesized by a slow hydrolysis of TiCl3 in the presence of gold nanoparticles, followed with a high-temperature annealing in Ar/H2. XRD patterns, TEM images, XPS spectra and UV-Vis absorption spectra were measured to reveal the crystal structure, morphology and light absorption properties of Au@H-TiO2. Compared to TiO2 and Au@A-TiO2 that is absent of oxygen deficiency, Au@H-TiO2 shows the highest photocatalytic rate for hydrogen evolution. This result could be attributed to enhanced charge-separation efficiency and reduced charge-transfer resistances, as supported by transient photocurrent response and electrochemical impedance spectra. These improvements could be correlated to Ti3 self-doping and Au modification in Au@H-TiO2.

关 键 词：二氧化钛 缺陷结构 纳米材料 光催化制氢 

分 类 号：O614.411[理学—无机化学]