Improvement of photocatalytic oxidation activity on a WO3/TiO2 heterojunction composite photocatalyst with broad spectral response
Improvement of photocatalytic oxidation activity on a WO3/TiO2 heterojunction composite photocatalyst with broad spectral response
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DOI：
10.1039/c5ra15378f
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发表时间：
2015-09
期刊：
影响因子：
3.9
通讯作者：
B. Ma;Jin Su Kim;Ting Wang;Jie Li;Keying Lin;Wanyi Liu;S. Woo
中科院分区：
文献类型：
--
作者：
B. Ma;Jin Su Kim;Ting Wang;Jie Li;Keying Lin;Wanyi Liu;S. Woo
设计并研究了能同时利用紫外光和可见光的WO 3/TiO 2光催化剂。结果表明，在紫外-可见光照射下，WO 3和TiO 2的光催化活性具有显著的协同效应。最佳的光催化剂WO 3/TiO 2显示出281 μmol h-1 g-1的氧释放速率，这甚至高于WO 3和TiO 2的光催化活性的总和。紫外-可见光谱表明WO 3/TiO 2具有较宽的光谱响应。XRD和拉曼光谱证实了WO 3的体相和表面相的形成。HRTEM图像显示在WO 3和TiO 2的界面处紧密接触，表明异质结的形成。因此，它被认为是广泛的光吸收和有效的电子转移通过异质结的WO 3/TiO 2占较高的光催化活性的WO 3/TiO 2。
WO3/TiO2 that can efficiently use ultraviolet and visible light simultaneously was designed and investigated for photocatalytic O2 evolution. It was found that a remarkable synergistic effect on the photocatalytic activity is obtained between WO3 and TiO2 under UV-visible light illumination. The optimum photocatalyst WO3/TiO2 shows an evolution rate of 281 μmol h−1 g−1 of oxygen, which is even higher than the summation of the photocatalytic activities of WO3 and TiO2. The UV-visible spectra indicate that WO3/TiO2 have a broad spectral response. XRD and Raman spectra demonstrated the formation of the bulk and surface phases of WO3. The HRTEM image shows a close contact at the interface of WO3 and TiO2, indicating the formation of heterojunctions. Thus, it is proposed that the broad light absorption and efficient electron transfer via heterojunctions of WO3/TiO2 account for the higher photocatalytic activity of WO3/TiO2.