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Photoelectrochemical responses of anodized titanium oxide films

Published online by Cambridge University Press:  31 January 2011

Archana Kar ,
Ryan Pando  and
Vaidyanathan (Ravi) Subramanian
Archana Kar
Affiliation:
Biomedical Engineering, University of Nevada, Reno, Nevada 89557
Ryan Pando
Affiliation:
Chemical Engineering, University of Nevada, Reno, Nevada 89557
Vaidyanathan (Ravi) Subramanian*
Affiliation:
Biomedical Engineering, University of Nevada, Reno, Nevada 89557
*
a)Address all correspondence to this author.e-mail: ravisv@unr.edu
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Abstract

Thin titanium films of 200 nm thickness were prepared by physical vapor deposition over conducting glass plates and anodized to form titanium oxide nanostructured film that demonstrates photoactivity under ultraviolet visible (UV-vis) illumination. Absorbance and photoelectrochemical measurements indicate that the anodized and nitrogen annealed films absorb UV-vis (λ = 300 to 800 nm) illumination to produce a current of 2.5 mA at 0 V and 3 mA at +0.4 V versus Ag/AgCl. A photocurrent of 110 μA and an open-circuit photovoltage (VOC) of 300 mV was noted without application of external bias. Long-term stability tests showed that the photocurrent was stable for 2 h under continuous illumination. The titanium oxide prepared from a small fraction of titanium deposited over conducting glass demonstrates almost similar activity compared with titanium oxides prepared on foils. The material offers promising potential in other applications such as environmental remediation and photocatalytic water splitting.

Keywords

CatalyticElectrochemical synthesisPhotovoltaic
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 1: Photocatalysis for Energy and Environmental Sustainability , January 2010 , pp. 82 - 88
Copyright
Copyright © Materials Research Society 2010

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