| Popis: |
The photocatalytic performance of a semiconductor material is significantly related to its crystalline phase, thus, crystalline phase engineering is of importance for designing the semiconductor composites fabricated between two semiconductor materials. In this work, WO _3 /g-C _3 N _4 composites was taken as an example, we designed and prepared the WO _3 /g-C _3 N _4 composites with different crystalline phases of WO _3 . The important role of the crystalline phase of WO _3 , which is hexagonal phase (h-WO _3 ), monoclinic phase (m-WO _3 ), and mixed phases of h-WO _3 and m-WO _3 on the morphology, photoabsorption property, charge separation efficiency, and photocatalytic activity of the WO _3 /g-C _3 N _4 composites were systematically investigated. By evaluating the photocatalytic degradation of RhB, it is found that the highest photocatalytic activity was achieved by WO _3 /g-C _3 N _4 with 25 wt% h-WO _3 and 75% g-C _3 N _4 (H1G3). The enhanced photocatalytic performance of H1G3 was mainly attributed to the improvement in the separation efficiency of photogenerated electron-hole pairs, which was confirmed by surface photovoltage results. Our work sheds a light on the design of composite photocatalysts based on semiconductor oxides. |
