用于改善光催化析氢的新型Z型WO/CeO异质结。
Novel Z-scheme WO/CeO heterojunction for improved photocatalytic hydrogen evolution.
作者信息
Shen Chun-Hui, Wen Xiao-Ju, Fei Zheng-Hao, Liu Zong-Tang, Mu Qi-Ming
机构信息
School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng, Jiangsu Province 224051, China; College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China.
School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng, Jiangsu Province 224051, China.
出版信息
J Colloid Interface Sci. 2020 Nov 1;579:297-306. doi: 10.1016/j.jcis.2020.06.075. Epub 2020 Jun 26.
The novel Z-scheme heterojunction photocatalyst WO/CeO was prepared by hydrothermal synthesis. The photocatalytic properties of WO/CeO were evaluated by photocatalytic hydrogen evolution under visible light. The result shows that the 15 wt% WO/CeO composite has the best hydrogen production efficiency of about 0.2061 mmol gh, which was 1.93 times higher than that the obtained pure CeO. The characterization results demonstrated that the existence of Z-scheme heterojunction structure at the contact interface of WO and CeO was the origin of the enhanced photocatalytic performance for hydrogen evolution, which could greatly increase the accumulation of photo-generated electrons and the separation efficiency of charge carrier. In accordance with density functional theory (DFT) calculation, we further confirmed the formation of Z-scheme heterojunction structures. This work is anticipated to expand the ideas for modifying CeO semiconductor materials to improve the rate of photocatalytic hydrogen production.
采用水热合成法制备了新型Z型异质结光催化剂WO/CeO。通过可见光下的光催化析氢反应评估了WO/CeO的光催化性能。结果表明，15 wt%的WO/CeO复合材料具有最佳的产氢效率，约为0.2061 mmol g/h，比所制备的纯CeO高1.93倍。表征结果表明，WO与CeO接触界面处Z型异质结结构的存在是光催化析氢性能增强的根源，这可以大大增加光生电子的积累和电荷载流子的分离效率。根据密度泛函理论（DFT）计算，我们进一步证实了Z型异质结结构的形成。这项工作有望拓展修饰CeO半导体材料以提高光催化产氢速率的思路。
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