Inorganic Chemistry Communications ( IF 3.8 ) Pub Date : 2021-08-28 , DOI: 10.1016/j.inoche.2021.108867 Yujing Ou 1 , Junqing Shi 1 , Quanqing Yan 1 , Chunlei Li 1 , Yi Zheng 1
Molten salt synthesis is an efficient method for preparation of photocatalyst. Enhancing precursor mixing effect is important. In this study, we found ethanol is important for synthsis of face-to-face type Bi4Ti3O12/Bi2Ti2O7 composite photocatalyst. The prepared Bi4Ti3O12/Bi2Ti2O7 (B3) composite under molar ratio of Bi:Ti of 4:3.6 displays higher photocatalytic activity compared with Bi4Ti3O12 (B1) and Bi2Ti2O7 (B4). The photocurrent density of B3 is 2 times higher than B1 and 1.6 times higher than B4, and B3 has smallest charge resistance between sample and solution. Combined with XPS, the study found that the higher photocatalytic activity origins from large charge transfer interface and built-in electric field (BIEF) around such interface, rathor than light absorption and dark adsorption.
中文翻译:
乙醇辅助熔盐合成 Bi4Ti3O12/Bi2Ti2O7 具有增强的可见光光催化性能
熔盐合成是制备光催化剂的有效方法。增强前体混合效果很重要。在这项研究中,我们发现乙醇对于合成面对面型 Bi 4 Ti 3 O 12 /Bi 2 Ti 2 O 7复合光催化剂很重要。与Bi 4 Ti 3 O 12 (B1) 和Bi 2 Ti 2相比,在Bi:Ti摩尔比为4:3.6的条件下制备的Bi 4 Ti 3 O 12 /Bi 2 Ti 2 O 7 (B3)复合材料显示出更高的光催化活性O 7 (B4)。B3的光电流密度比B1高2倍,比B4高1.6倍,B3样品和溶液之间的电荷电阻最小。结合XPS,研究发现较高的光催化活性源于大的电荷转移界面和该界面周围的内置电场(BIEF),而不是光吸收和暗吸附。