First Study on Phosphonite-Coordinated Ruthenium Sensitizers for Efficient Photocatalytic Hydrogen Evolution

详细信息    查看全文

• 作者：T. Swetha ; Indranil Mondal ; K. Bhanuprakash ; Ujjwal Pal ; Surya Prakash Singh
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 9, 2015
• 年：2015
• 卷：7
• 期：35
• 页码：19635-19642
• 全文大小：510K
• ISSN：1944-8252

文摘

For the first time we report the design and syntheses of phosphonite coordinated ruthenium(II) sensitizers bearing 膱N虃N ligand and/or terpyridine derivatives carboxylate anchor (GS11, GS12. and GS13) and its application for hydrogen production over Pt鈥揟iO₂ system. These heteroleptic complexes exhibit broad metal-to-ligand charge transfer transition band over the whole visible regime extending up to 900 nm. DFT calculations of these complexes show that the HOMO is distributed over the Ru and Cl atom whereas; LUMO is localized on the polypyridile ligand, which are anchored on TiO₂ surface. Among the sensitizers tested for photocatalytic hydrogen evolution, GS12 exhibited a maximum turnover number (TON) 8605 (for 8h), which is very high compared to the reference sensitizer (N719) with TON 163 under similar evaluation condition. The dependence of the hydrogen evolution rate at different pH using GS11, GS12, GS13, and DX-1-sensitized Pt鈥揟iO₂ has been studied and the maximum H₂ production yield was obtained at pH 7 for all sensitizers.