期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 15, 页码 17601-17609出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c04302
关键词
crystal plane; terminated hydroxyl groups; TiO2; photocatalytic water splitting DRIFTS
资金
- National Natural Science Foundation of China [22178291, 22002123, 22109132]
- Provincial Project of Sichuan Province [2020YFH0118, 2021YFSY0046]
- Science Project of SWPU [2021JBGS01]
- Open Project of SWPU [2020KSZ05020]
Understanding the relationship between crystal facets and photocatalytic performance is crucial for developing efficient catalysts. This study investigates TiO2 with controllable exposed facets for photocatalytic hydrogen evolution. The adsorption and photo-driven breaking of hydroxyl groups on the exposed facets are found to strongly affect the catalytic activity. Furthermore, graphene quantum dots (GQDs) on the TiO2 surface enhance the reaction of hydroxyl groups on (001)TiO2, while restricting the reaction on (101)TiO2.
Understanding the relation between a crystal facet and photocatalytic performance is of great importance for the development of effective catalysts. In this work, we focus on anatase TiO2 with controllable exposed facets toward photocatalytic hydrogen evolution by water splitting. By combining temperature-programmed desorption (TPD) and diffuse reflectance infrared spectroscopy (DRIFTS), we obtain that the adsorption of hydroxyl groups and the photo-driven breaking of hydroxyl groups depend strongly on the exposed facets. As a result, the higher catalytic hydrogen evolution activity of TiO2 enclosed with (101) facets than that of (001) facets should be ascribed to the more favorable depletion of hydroxyl groups. Moreover, graphene quantum dots (GQDs) with rich surface functional groups are deliberately deposited on the TiO2 surface. The determination of the states and dynamics of surface hydroxyl groups suggests that GQDs facilitate the reaction of hydroxyl groups on (001)TiO2 , thus leading to the activity enhancement. By contrast, the already active (101)TiO2 become apparently less efficient after GQD deposition due to the restricted reaction of hydroxyl groups. Overall, our findings not only provide a unique guidance for understanding the crystal-plane-dependent photocatalysis but also present a powerful approach by which to tailor the photocatalytic performance.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据