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The Z-scheme has been proven to be an effective strategy to develop a high-efficiency visible-light photocatalyst. However, the visible-light-responding active component in the Z-scheme system is usually restricted to semiconductor materials sensitive to visible light. On the other hand, noble-metal nanoparticles (such as Ag) can act as an active component for the design of high-efficiency plasmonic photocatalysts due to their strong absorption in the visible light region. In this study, H 2 WO 4 ·H 2 O/Ag/AgCl composite nanoplates were prepared by a one-step ionic reaction between Ag 8 W 4 O 16 /Ag nanorods and HCl aqueous solution. The photocatalytic activity experiments indicated that the H 2 WO 4 ·H 2 O/Ag/AgCl composite nanoplates exhibited a much higher photocatalytic activity than the one-component (H 2 WO 4 ·H 2 O) or two-component (such as Ag/AgCl and H 2 WO 4 ·H 2 O/Ag) photocatalysts. On the basis of photocatalytic activity and band structure analysis, a plasmonic Z-scheme photocatalytic mechanism is proposed; namely, two-step visible-light absorption is caused by the localized surface plasmon resonance of metallic Ag nanoparticles and the band gap photoexcitation of H 2 WO 4 ·H 2 O. The present results suggest that metallic Ag nanoparticles can act as an effective active component for the construction of a Z-scheme visible-light photocatalyst. Considering the versatility and flexibility of noble-metal nanoparticles and semiconductors, this work may provide some insight into the design of novel and highly efficient Z-scheme visible-light photocatalysts.
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Wang et al. (2011) studied this question.
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