Preparation of AgIn 5 S 8 /TiO 2 Heterojunction Nanocomposite and Its Enhanced Photocatalytic H 2 Production Property under Visible Light
2013; American Chemical Society; Volume: 3; Issue: 2 Linguagem: Inglês
10.1021/cs300724r
ISSN2155-5435
AutoresKan Li, Bo Chai, Tianyou Peng, Jing Mao, Ling Zan,
Tópico(s)Quantum Dots Synthesis And Properties
ResumoAgIn5S8/TiO2 nanocomposite is prepared through a one-pot hydrothermal method, which is used for photocatalytic H2 production under visible-light irradiation. The effects of AgIn5S8/TiO2 molar ratio in the nanocomposites on the crystal phase, microstructure, optical absorption properties, and photocatalytic H2 evolution activity are investigated comparatively. The pristine AgIn5S8 shows a sharp absorption edge at ∼705 nm, corresponding to a bandgap of ∼1.76 eV, and its visible-light-driven photoactivity for H2 production can be remarkably enhanced by coupling with TiO2. The AgIn5S8/TiO2 nanocomposite with molar ratio of 1:10 has the maximum photoactivity for H2 production, improved by 7.7 times as compared with the pristine AgIn5S8. The enhanced photoactivity can be ascribed to some AgIn5S8 nanoparticles closely contacting the TiO2 nanoparticles to form heterojunction structure. This configuration of the composite photocatalyst results in an efficient charge separation at the interface, followed by fast diffusion of photoelectrons generated in AgIn5S8 toward TiO2, which is beneficial for separating the photogenerated carriers in space and improving the photoactivity.
Referência(s)