Electrochemical investigation of doped titanium dioxide.

Hamilton, J.W.J.; Byrne, J.A.; McCullagh, C.; Dunlop, P.S.M.

Abstract

Thin films of transition-metal doped (0.2, 1.0, and 5.0 atom%) TiO2 were prepared on titanium foil using a sol-gel route catalyzed by ammonium acetate. Dopants investigated were the fourth-period transition metals. The prepared films were characterised by Raman spectroscopy, Auger electron spectroscopy, and photoelectrochemical methods. The films doped with transition metals showed a lower photocurrent response than undoped samples. No major red shift in the photocurrent response spectra of the doped films was observed. A photocurrent response was observed under visible light irradiation of the samples and was potential dependent peaking around −0.3 V (SCE), which is indicative of electron promotion from a filled defect level. Examination of the defect level potential dependence by analysis of the current-time response under chopped illumination at fixed potential (−0.8 V–+1.07 V) gave a good correlation with the potential dependence observed in the visible light irradiation studies.

Citation

HAMILTON, J.W.J., BYRNE, J.A., MCCULLAGH, C. and DUNLOP, P.S.M. 2008. Electrochemical investigation of doped titanium dioxide. International journal of photoenergy [online], 2008, article ID 631597. Available from: https://doi.org/10.1155/2008/631597

• Journal Article Type: Article
• Acceptance Date: Jan 25, 2008
• Online Publication Date: May 21, 2008
• Publication Date: Dec 31, 2008
• Deposit Date: Aug 12, 2024
• Publicly Available Date: Aug 12, 2024
• Journal: International journal of photoenergy
• Print ISSN: 1110-662X
• Electronic ISSN: 1687-529X
• Publisher: Hindawi
• Peer Reviewed: Peer Reviewed
• Volume: 2008
• Article Number: 631597
• DOI: https://doi.org/10.1155/2008/631597
• Keywords: Transition metals; Photocurrent responses; Titanium dioxide (TiO2); Photoactivity
• Public URL: https://rgu-repository.worktribe.com/output/2055810