Abstract
Difficulties in developing efficient visible-light-response photocatalysts have led to a lack of optimism in the utilization of large-scale solar energy. This article enhances the understanding of the Cr-SrTiO3 catalyst for photocatalytic overall water splitting from the perspective of micro-regulation of Ti3+ defects and oxygen vacancy concentration. The advanced characterization techniques including XPS and EPR confirm these analyses. Compared to pure Cr-SrTiO3, the Na, Cr-SrTiO3 achieve a H2 production of 40.09 μmol∙h−1, indicating that adjusting the defect state can have a major impact on carrier migration. In addition, DFT calculations show that the phenomenon of charge localization varies with the introduction of Na+/K+/Cs+, and compared to pure SrTiO3 and Cr-SrTiO3, the additional introduction of Na+ causes the best delocalization properties cooperating with Cr3+, indicating a significant transition from deep traps centered on Ti3+ to shallow defects, which is the key to improving photocatalytic activity.
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