Zhou Diwen, Wang Ganyu, Feng Yuan, Chen Wenqian, Chen Jinyi, Yu Zhichong, Zhang Yu, Wang Jiajun, Tang Liang
Key Laboratory of Organic Compound Pollution Control Engineering, Ministry of Education, Shanghai 200444, PR China.
Dalton Trans. 2021 Jun 8;50(22):7768-7775. doi: 10.1039/d1dt00825k.
Strontium titanate (SrTiO3) is considered to be a promising photocatalyst. However, the rapid recombination of photo-generated charge carriers limits the practical applications of SrTiO3-based photocatalysts. In this work, we prepared hydrogenated SrTiO3 using NaBH4 as a reducing reagent. The optimized photocatalyst shows a H2-evolution rate up to 409.5 μmol g-1 h-1 with a CuS co-catalyst, which is 152, 14 and 1.8 times higher than those of pure SrTiO3, hydrogenated SrTiO3, and CuS/SrTiO3, respectively. The enhanced photocatalytic H2-evolution activity can be attributed to the synergistic effect of the CuS co-catalyst and the appropriate oxygen vacancies produced by hydrogenation, which are beneficial for lowering the separation of photo-generated charge carriers. The present finding could shed light on the design of efficient SrTiO3-based photocatalysts.
钛酸锶（SrTiO₃）被认为是一种很有前景的光催化剂。然而，光生电荷载流子的快速复合限制了基于SrTiO₃的光催化剂的实际应用。在这项工作中，我们使用硼氢化钠（NaBH₄）作为还原剂制备了氢化SrTiO₃。优化后的光催化剂在硫化铜（CuS）共催化剂存在下，析氢速率高达409.5 μmol g⁻¹ h⁻¹，分别比纯SrTiO₃、氢化SrTiO₃和CuS/SrTiO₃高152倍、14倍和1.8倍。光催化析氢活性的增强可归因于CuS共催化剂与氢化产生的适当氧空位的协同效应，这有利于降低光生电荷载流子的分离。本研究结果可为高效的基于SrTiO₃的光催化剂的设计提供启示。
