Key Words:Sulfur compounds;Cadmium compounds - Heterojunctions - Hydrogen production - Light - Nanocomposites - Oxygen vacancies - Photocatalytic activity - Sodium Borohydride - Solar power generation - Solid state reactions - Strontium titanates - Titanium compounds - Zinc compounds
Abstract:Heterostructure plays significant roles in many photocatalytic reactions, as it can provide more efficient route for the charge carrier separation and transferring. Herein, we report a rational design of a new kind of photocatalyst, in which SrTiO<inf>3</inf>-T/Cd<inf>0.5</inf>Zn<inf>0.5</inf>S heterostructure is prepared via a simple hydrothermal method. SrTiO<inf>3</inf> with oxygen vacancy is prepared by a controllable solid-state reaction of NaBH<inf>4</inf> and SrTiO<inf>3</inf> nanocrystals. The oxygen vacancies on the surface of SrTiO<inf>3</inf> can be used as electron traps to attract electrons from Cd<inf>0.5</inf>Zn<inf>0.5</inf>S and provide proton reduction sites for H<inf>2</inf> production during the photocatalysis processing, thereby effectively inhibit the recombination of electron-hole pairs. It has demonstrated that SrTiO<inf>3</inf>-T/Cd<inf>0.5</inf>Zn<inf>0.5</inf>S nanocomposites can achieve the highest photocatalytic hydrogen evolution rate of 25.01 mmol g<sup>−1</sup> h<sup>−1</sup> under visible light, which is about 2 times than that of the original Cd<inf>0.5</inf>Zn<inf>0.5</inf>S.<br/> © 2019 Elsevier B.V.
Volume:438
Issue:无
Translation or Not:no