Determining the electric-field strength in a passive film via photo-induced electric fields
By Mao, Feixiong; Yao, Jizheng; Zhou, Yuting; Dong, Chaofang; Kursten, Bruno; Macdonald, Digby D.
Published in Corrosion Science
2019
Abstract
The nature of the electric-field strength in the passive film on tungsten is explored using photo-electrochemical techniques. A theoretical expression for the photo-stimulated growth of the film has been derived. Rotating ring-disk electrode (RRDE) experiments indicate that photo-corrosion of a tungsten electrode is negligible under super-band gap light illumination. XPS results show that tungsten is in the maximum possible oxidation state (VI) in the film and hence no higher oxidation state is available. The photo-stimulated transient film growth of tungsten in pH 8.5
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