Photoelectrochemical properties of Ti-doped hematite nanosheet arrays decorated with CdS nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (78) ◽  
pp. 74234-74240 ◽  
Author(s):  
Xin Xie ◽  
Kui Li ◽  
Wei-De Zhang
Keyword(s):  
Visible Light ◽  
Cadmium Sulfide ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Cds Nanoparticles ◽  
Photoelectrochemical Properties ◽  
Cadmium Sulfide Nanoparticles ◽  
Photoelectrochemical Response ◽  
Nanosheet Arrays ◽  
Vertically Aligned

A photoanode comprised of vertically aligned Ti-doped hematite nanosheet arrays decorated with cadmium sulfide nanoparticles was fabricated. The Ti-Fe2O3/CdS electrode shows high photoelectrochemical response under visible light irradiation.

CdS/TiO2 composite films for methylene blue photodecomposition under visible light irradiation and non-photocorrosion of cadmium sulfide

2014 ◽  
Vol 68 (9) ◽  
Author(s):  
María Hernández-Torres ◽  
María Ojeda-Carrera ◽  
Manuel Sánchez-Cantú ◽  
Nicolás Silva-González ◽  
Justo Gracia-Jiménez
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Cadmium Sulfide ◽  
Visible Light Irradiation ◽  
Deposition Time ◽  
Sol Gel ◽  
Composite Films ◽  
Light Irradiation ◽  
Visible Range ◽  
Sem Images

AbstractCadmium sulfide/titanium dioxide (CdS/TiO2) composite films were grown on glass by the chemical bath deposition (DBQ) and sol-gel/dip coating methods, respectively, in order to increase the photocatalytic activity of TiO2 in photodegradation processes. The influence of the CdS deposition time on the morphology, optical absorption, and phononic modes of the composites were examined. Scanning electron microscopy (SEM) images showed clearly the CdS deposit on the TiO2 surface. The absorbance spectra indicated that the absorption of composites depends on the CdS deposition time and the absorption edges are shifted to the visible range. Micro Raman spectra exhibited the phonons associated with the TiO2 anatase and the longitudinal optic (LO) phonon of CdS whose intensity increases with the CdS deposition time. Photodegradation of methylene blue (MB) under visible light irradiation was observed in all films and the results were compared with those obtained with TiO2 films. The decomposition is higher for the composite with the CdS deposition time of 15 min. This optimal deposition time allows maximal enhancement of the charge carriers transfer to TiO2 involved in the photocatalysis. No signal associated with cadmium was detected by the atomic absorption spectroscopy (AAS), which means that the CdS photocorrosion does not occur since trap centers such as OH-Cd-S and Cl−, which trap holes and inhibit the photocorrosion, are produced during the growth process.

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