Wang Jiajia, Xu Xilong, Liu Yuanyuan, Wang Zeyan, Wang Peng, Zheng Zhaoke, Cheng Hefeng, Dai Ying, Huang Baibiao
State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P.R. China.
School of Physics, Shandong University, Jinan, 250100, P.R. China.
ChemSusChem. 2020 Jul 7;13(13):3488-3494. doi: 10.1002/cssc.202000595. Epub 2020 May 27.
Oxygen vacancies are usually thought to be beneficial for photogenerated charge separation. In this work, the oxygen vacancies in ov-Bi O (Bi O with oxygen vacancy) were found to be able to produce O in the dark owing to chemical adsorption. The oxygen vacancies were further found to be responsible for ov-Bi O exhibiting higher O generation under light irradiation with O as the only reactive oxygen species (ROS) than Bi O with O , H O , and others as the ROS. The photocatalytic activity was investigated for the selective photo-oxidation of phenyl methyl sulfide to phenyl methyl sulfoxide and phenyl alcohol to benzaldehyde. In either case, ov-Bi O displayed better performance than Bi O , suggesting the significant role of oxygen vacancies in modulating the photocatalytic oxidation properties. This work provides an alternative approach to obtain singlet oxygen, which may guide further design of photocatalysts with high efficiency and selectivity towards photocatalytic organic synthesis.
氧空位通常被认为有利于光生电荷分离。在这项工作中，发现ov-BiO（具有氧空位的BiO）中的氧空位由于化学吸附能够在黑暗中产生O。进一步发现，与以O、H2O等作为活性氧物种（ROS）的BiO相比，ov-BiO在以O作为唯一ROS的光照下表现出更高的O生成量，这归因于氧空位。研究了光催化活性，用于将苯甲硫醚选择性光氧化为苯甲亚砜以及将苯甲醇光氧化为苯甲醛。在这两种情况下，ov-BiO都表现出比BiO更好的性能，表明氧空位在调节光催化氧化性能方面具有重要作用。这项工作提供了一种获得单线态氧的替代方法，这可能会指导进一步设计对光催化有机合成具有高效率和选择性的光催化剂。
