open access

https://hdl.handle.net/2115/62191

Cathodic Reduction of Anodic Oxide Films Formed on Titanium

英語

reduction (chemical)

1987-10

The Electrochemical Society

J. Electrochemical Society

134(10)

2406-2410

Cathodic reduction behavior of the anodic oxide film on titanium has been investigated by using ellipsometry combined with electrochemistry. In acidic sulfate solution, the anodic oxide film reductively dissolves into the solution as Ti(III) ion, resulting in the thinning of its thickness without any significant change of the optical property of the remaining film. In neutral phosphate solutiofi, the anodic oxide film absorbs hydrogen in the hydrogen evolution potential region, resulting in a change of the optical property without thinning its thickness. The amount of hydrogen absorbed per unit volume of the film does not depend on the film thickness but on the cathodic potential. The composition change estimated from measurements of anodJc charge during the hydrogen release process indicates that the hydrogen absorption begins to occur at about -0.25V (vs. RHE) and that the anodic film changes in its composition from TiO2 to TiOOH at -0.9V. The hydrogen absorption induces a decrease of the refractive index and an increase of the extinction index of the anodic film.

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© The Electrochemical Society, Inc. 1987. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in J. Electrochem. Soc. 1987 volume 134, issue 10, 2406-2410 .

0013-4651

1945-7111