高效稳定的Al~(3+)偶联多层Eosin Y敏化TiO_2光催化制氢体系研究

通过Al3+偶联制备了多层EosinY敏化的TiO2催化剂,其光催化制氢性能优于Fe3+偶联的催化剂.在水体系、甲醇-水体系中,以三乙醇胺(TEOA)作电子给体,采用原位载Pt,考察了催化剂在可见光(λ420nm)下的制氢活性与稳定性.结果表明,含水0.5%(体积分数)的体系、载铂量为1.0%时,显示了较高的活性和良好的稳定性,20h的平均量子效率为20.5%,转换数为220.较高的活性和稳定性初步归结于Al3+水解趋势较Fe3+小,且催化剂在甲醇中比在水中更稳定,进一步的研究正在进行中.

Studies on high efficient and stable reaction system for photocatalytic hydrogen evolution with multilayer-Eosin

An efficient visible-light active photocatalyst of multilayer-EosinY-sensitized TiO_2 was prepared through linkage of Al~(3+) to form 3-dimensional polymeric dye structure. The performance of the as-prepared photocatalyst was compared with multilayer-Eosin Y-sensitized TiO_2 via Fe~(3+) coupling. The activity and stability of multilayer-dye-sensitized photocatalyst were investigated in water and methanol reaction system using triethanolamine as electron donor under visible light irradiation (λ>420 nm). The effects of water content in methanol and Pt loading content were studied. In methanol reaction system, the photocatalyst exhibited high activity and stability when water content was 0.5% (volume fraction) and Pt loading content was 1.0%. Its average apparent quantum yield for hydrogen evolution was 20.5% in 20 h with 220 turnover number. The high activity and stability could be attributed to that hydrolysis of Al~(3+) is lower than that of Fe~(3+), and 3-dimensional polymeric dye structure with Al~(3+) in methanol system is more stable than in water system. The further studies are in progress.