Abstract The highly effective photoelectrochemical materials based on TiO 2 nanotube arrays (TiO 2 NTs) co-sensitized by Ag 2 WO 4 and AgX (X=Cl, Br, I) were in-situ prepared by a successive ionic layer adsorption and reaction deposition of Ag 2 WO 4 nanoparticles on TiO 2 NTs followed by ion exchange to form Ag 2 WO 4 -AgX (X=Cl, Br, I) heterojunctions by a hydrothermal method. The deposition of Ag 2 WO 4 -AgX (X=Cl, Br, I) nanoparticles was investigated by XRD and SEM. The Ag 2 WO 4 -AgX (X=Cl, Br, I) sensitization significantly extended the inherent UV absorption of TiO 2 NTs to the visible light region. The photoelectrochemical properties including the visible light photocurrent response and photoelectrocatalytic removal of methyl orange, rhodamine B and Cr(VI) were investigated in detail. The results indicated the TiO 2 NTs/Ag 2 WO 4 -AgBr photoelectrode showed the optimal photoelectrochemical properties, which could be attributed to the excellent energy band structure and interface conductance.

中文翻译：

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基于Ag 2 WO 4 -AgX (X=Cl, Br, I) 敏化TiO 2 纳米管阵列的太阳能材料的高效光电化学性能

摘要 以Ag 2 WO 4 和AgX (X=Cl, Br, I)共敏化的TiO 2 纳米管阵列(TiO 2 NTs)为基础，通过连续离子层吸附和反应沉积原位制备高效光电化学材料。 Ag 2 WO 4 纳米颗粒在TiO 2 NTs 上，然后离子交换以通过水热法形成Ag 2 WO 4 -AgX (X=Cl, Br, I) 异质结。通过XRD和SEM研究了Ag 2 WO 4 -AgX (X=Cl, Br, I)纳米颗粒的沉积。Ag 2 WO 4 -AgX (X=Cl, Br, I) 敏化显着扩展了 TiO 2 NTs 的固有紫外吸收到可见光区域。详细研究了光电化学性质，包括可见光光电流响应和光电催化去除甲基橙、罗丹明 B 和 Cr(VI)。