Cus Co-Catalyst Modified Hydrogenated Srtio3 Nanoparticles As An Efficient Photocatalyst For H-2 Evolution

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 H-2-evolution rate up to 409.5 mu mol 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 H-2-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.