Sn_0.9Sb_0.1O₂/TiO₂ (ATO/TiO₂) heterostructure is a potential visible light photocatalysts that function via an inter-semiconductor hole-transport mechanism. Herein we selectively deposited Au, Ag, or Pt onto the ATO surface of ATO/TiO₂ to investigate charge-trapping behaviors of the noble metals and their effects on photocatalytic performance. We observed that Pt deposition greatly enhanced the photocatalytic activity whereas effects of Au or Ag depositions were not significant. The result of spectroscopic analysis also indicates that Pt is the most effective in scavenging the electrons from the ATO CB. Particularly, Pt/ATO/TiO₂ (ATO:TiO₂ = 15:85 in weight) produced CO₂ of 42 ppmv in 2 h, which is 16 times and 4.8 times that of bare ATO/TiO₂ and nitrogen-doped TiO₂, respectively. Pt deposition on the ATO seems to suppress two independent charge recombination pathways, that is, recombination of electron-hole pairs in ATO and electron transport from the ATO CB to TiO₂ VB.

Sn _0.9 Sb _0.1 O ₂ / TiO ₂（ATO / TiO ₂）异质结构是一种潜在的可见光光催化剂，其通过半导体间的空穴传输机制起作用。本文中，我们选择性地将Au，Ag或Pt沉积到ATO / TiO ₂的ATO表面上，以研究贵金属的电荷俘获行为及其对光催化性能的影响。我们观察到Pt沉积大大增强了光催化活性，而Au或Ag沉积的影响并不显着。光谱分析的结果还表明，Pt在清除ATO CB中的电子方面最有效。特别是Pt / ATO / TiO ₂（ATO：TiO ₂重量比= 15:85）在2小时内产生了42 ppmv的CO ₂，分别是裸ATO / TiO ₂和氮掺杂TiO _2的16倍和4.8倍。Pt在ATO上的沉积似乎抑制了两个独立的电荷复合路径，即ATO中电子-空穴对的重组以及电子从ATO CB到TiO ₂ VB的传输。