An enhanced CdS/TiO2 photocatalyst with high stability and activity: Effect of mesoporous substrate and bifunctional linking molecule

Structure characteristics of CdS/H1.9K0.3La0.5Bi0.1Ta2O7 and photocatalytic activity for hydrogen evolution under visible light

“…However, it is surprising that when CdS particles combine with HKBLT, the composite shows higher photocatalytic activity for hydrogen evolution (504.2 mmol/h) than that of pure CdS, even than that of 0.5 wt%Pt/CdS, although the content of CdS in composite is low (12 wt%). It is reported that CdS/TiO 2 [10,15,27] shows a higher photocatalytic activity than that of pure CdS under visible light since the transfer of electrons from CB in CdS to CB in TiO 2 promotes the separation of electrons and holes. In our study, the band gap of HKLBT is 3.9 eV and the CB and VB are composed of Ta5d and O2p states, which are very similar to Ta 2 O 5 .…”

“…However, in order to improve photocatalytic activity for hydrogen evolution, modification of CdS by co-catalyst such as Pt or Pd [8,9] is necessary to prevent the recombination of photo-electrons and holes, which limits its practical application. Recently, it was reported [10,11] that combining CdS with some semiconductors possessing different band energy structures (TiO 2 , KNbO 3 ) showed considerable higher photocatalytic activity for hydrogen production than that on pure CdS under visible light since the photogenerated electrons from CdS can transfer to the CB of oxide semiconductors (TiO 2 ), while the holes are retained in the VB of CdS, and achieve the effective carrier separation. Cui et al [12]reported that CdS intercalated K 4 Nb 6 O 17 (K 4 Nb 6 O 17 /CdS) composite photocatalysts can not only promote the efficiency of separation of photogenerated electrons and holes, but can also prevent the photo-corrosion of these nano-particles due to the protecting of K 4 Nb 6 O 17 .…”

Solvothermal synthesis of CdS QDs/MWCNTs nanocomposites with high efficient photocatalytic activity under visible light irradiation

“…However, the low separation efficiency of electron-hole pairs is one critical issue that limits the application of pure CdS [10]. To enhance the photocatalytic activity of CdS, many researchers have been focused on the composites combining CdS with other components, including noble metals [11,12], graphene [13,14], graphene oxide [15,16], TiO 2 [17,18], ZnO [19,20], CdSe [21], ZnS [22,23], or with carbon materials [24,25] and so on. Multi-walled carbon nanotubes (MWCNTs) are one-dimensional carbon nanomaterials which have attracted tremendous attention owing to their excellent properties, such as extraordinary structure, superior conductivity and good chemical stability [26][27][28].…”

Ex-situ sensitization of ordered TiO2 nanotubes with CdS quantum dots

“…Thus, the choice of the linker molecule is crucial for the successful ex-situ sensitization of TiO 2 [11,13,16,28]. Hitherto, different linker molecules (mercaptopropionic acid [29], thiolacetic acid [30], 2,3-dimercapto-succinic acid [31]) were used to attach CdS QDs onto TiO 2 .…”