可见光响应光催化剂BiYWO_6的制备、表征及其完全分解水的研究

Preparation and Characterization of Novel Visible-light-driven BiYWO_6 Photocatalyst and Its Application to Overall Water Splitting

制备了一种可见光响应的光催化剂BiYWO6,该体系是Bi2WO6-Y2WO6的伪二元固溶体,其禁带宽度为2.71eV.其负载了助催化剂后,可在紫外光和可见光下完全分解水生成氢气和氧气,其中负载RuO2助催化剂的BiYWO6具有最好的光催化活性.通过对光催化反应前后的BiYWO6和助催化剂的表面各元素的化学状态的研究证实了RuO2/BiYWO6体系的稳定性.比较分析了BiYWO6的能带结构,认为可见光完全分解水的性能可归因于Y和Bi在固溶体BiYWO中形成了合适的能带结构.

A new solid solution oxide BiYWO6 （BYW）was prepared by solid state reaction at a high temperature and discovered to split water into HE and O2 under visible light. The XPS results proved the stability of RUOE/BiEWO6 in the photocatalytic reaction. RuO2 was the most suitable cocatalyst for BYW. Sacrificial reagents were used to confirm the photocatalytic ability of BYW. The formation of solid solution of Y2WO6 and BiEWO6 was suggested to raise the bottom position of conduction band and to make Bi6s contribute to creating new valence band higher than that of O2p.