Journal
PHYSICA B-CONDENSED MATTER
Volume 554, Issue -, Pages 57-63Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2018.11.048
Keywords
Fe2O3 nanotube; Photo deposition; Cadmium sulfide; Photoelectrochemical water splitting
Categories
Funding
- Iran National Science Foundation [93047933]
- Isfahan University of Technology
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Hematite is an appropriate compound for photoelectrochemical water splitting. However, passive surface state, high recombination rate of the photo induced electron-hole pairs and poor and slow charge transfer kinetics restrict the performance of hematite. In this work, CdS/Fe2O3 NTs samples have been successfully prepared by coating of CdS nanoparticles on the surface of the self-organized Fe2O3 NTs via photo deposition technique in order to enhance charge separation and charge transfer kinetics. FESEM (Field Emission Scanning Electron Microscopy), XRD (X-ray diffraction), DRS (Diffraction Reflection Spectroscopy) and XPS (X-ray Photoelectron Spectroscopy) analyses have been used to characterize the CdS/Fe2O3 NTs photoelectrodes obtained. CdS/Fe2O3 NTs has an intense visible light absorption and displays a red-shift of the band edge in comparison with the bare Fe2O3 NTs, according to DRS test. The photocurrent density of Fe2O3 NTs increased approximately 5 times upon coating with CdS, as shown by photoelectrochemical measurements, indicating the significant role of the introduction of CdS in the enhancement of photo catalytic activity. CdS/Fe2O3 NTs may be promising and effective photoanodes in PEC water splitting given their simple preparation and good performance.
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