Iron doped nanostructured TiO₂ for photoelectrochemical generation of hydrogen

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• 作者：Aadesh P. Singh ; Saroj Kumari ; Rohit Shrivastav ; Sahab Dass ; Vibha R. Satsangi
• 关键词：Photoelectrochemical ; Hydrogen ; Iron doping ; TiO₂ ; Sol-gel
• 刊名：International Journal of Hydrogen Energy
• 出版年：2008
• 出版时间：October 2008
• 年：2008
• 卷：33
• 期：20
• 页码：5363-5368
• 全文大小：449 K

文摘

This paper describes the photoelectrochemical studies on nanostructured iron doped titanium dioxide (TiO₂) thin films prepared by sol-gel spin coating method. Thin films were characterized by X-ray diffraction, Raman spectroscopy, spectral absorbance, atomic force microscopy and photoelectrochemical (PEC) measurements. XRD study shows that the films were polycrystalline with the photoactive anatase phase of TiO₂. Doping of Fe in TiO₂ resulted in a shift of absorption edge towards the visible region of solar spectrum. The observed bandgap energy decreased from 3.3 to 2.89 eV on increasing the doping concentration upto 0.2 at. % Fe. 0.2 at. % Fe doped TiO₂ exhibited the highest photocurrent density, 0.92 mA/cm² at zero external bias. Flatband potential and donor density determined from the Mott–Schottky plots were found to vary with doping concentration from −0.54 to −0.92 V/SCE and 1.7 × 10¹⁹ to 4.3 × 10¹⁹ cm⁻³, respectively.