Core/Shell Structured La- and Rh-Codoped SrTiO3 as a Hydrogen Evolution Photocatalyst in Z-Scheme Overall Water Splitting under Visible Light Irradiation

详细信息    查看全文

• 作者：Qian Wang ; Takashi Hisatomi ; Su Su Khine Ma ; Yanbo Li ; Kazunari Domen
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：July 22, 2014
• 年：2014
• 卷：26
• 期：14
• 页码：4144-4150
• 全文大小：345K
• ISSN：1520-5002

文摘

The effects of preparation methods, calcination times, and La doping concentrations on the crystallinity, visible light absorption, and photocatalytic water splitting performance of Rh- and La-codoped SrTiO₃ (SrTiO₃:La/Rh) were investigated. Applying a two-step solid state reaction in which SrTiO₃ acted as a perovskite-type host produced core/shell structured SrTiO₃:La/Rh, the surface of which was enriched with the dopants. La doping suppressed the formation of oxygen vacancies and inactive Rh⁴⁺ species. Under visible light irradiation (位 > 420 nm), SrTiO₃:La/Rh exhibited 3.5 and 3.8 times higher rates of H₂ evolution in an aqueous methanol solution and during redox-free Z-scheme overall water splitting in combination with Ir/CoO_x/Ta₃N₅, respectively, compared to SrTiO₃:Rh. The solar-to-hydrogen efficiency of the Z-scheme system as measured under illumination with simulated sunlight (AM1.5G) was found to have improved by a factor of 3.