A stable and highly efficient visible-light-driven hydrogen evolution porous CdS/WO3/TiO2 photocatalysts
- School of Chemistry and Chemical Engineering, Anyang Normal University, Henan Province (China)
Highlights: • Highly efficient and stable photocatalytic activity of CdS/WO{sub 3}/TiO{sub 2} photocatalysts were synthesized by a two-step method. • CdS and WO{sub 3} inlaid on porous TiO{sub 2} can extend the light absorption and enhance photogenerated electron-hole pairs separation. • The porous structure can provide more reaction active sites and improve photoproduced-electrons and holes transport speed. - Abstract: It is well known that both catalytic efficiency and stability are the two important parameters of photocatalysts for visible-light-driven hydrogen production reactions. However, light-driven hydrogen evolution based applications still suffer from sluggish reaction kinetics due to the lack of high-performance photocatalysts. In this paper, we successfully synthesized a ternary porous CdS/WO{sub 3}/TiO{sub 2} photocatalyst with high efficiency and stability via two-stage approach. The as-prepared samples are characterized by XRD, FESEM, EDS, TEM, XPS, and UV–Vis, respectively, which illustrated that the CdS and WO{sub 3} moieties are in-situ formed inside the porous TiO{sub 2}. Particularly, the photocatalytic hydrogen (H{sub 2}) evolution rate of such ternary 8% CdS/WO{sub 3}/TiO{sub 2} (molar ration of CdS:WO{sub 3}:TiO{sub 2} = 8:8:100) photocatalyst ranges up to 2106 μmol h{sup −1} g{sup −1} under visible-light irradiation, which is higher than that of pure TiO{sub 2} and other binary (CdS/TiO{sub 2} and WO{sub 3}/TiO{sub 2}) porous photocatalysts. The superior H{sub 2} evolution efficiency can be attributed to the coexistence of CdS and WO{sub 3} in porous TiO{sub 2} which can promote the interfacial charge transfer and separation as well as extend the light absorption up to the visible range.
- OSTI ID:
- 22805071
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Vol. 142; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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