Determining the electric-field strength in a passive film via photo-induced electric fields

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Determining the electric-field strength in a passive film via photo-induced electric fields. / Mao, Feixiong; Yao, Jizheng; Zhou, Yuting; Dong, Chaofang; Kursten, Bruno; Macdonald, Digby.

In: Corrosion Science, Vol. 154, 01.07.2019, p. 239-245.

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Mao, F, Yao, J, Zhou, Y, Dong, C, Kursten, B & Macdonald, D 2019, 'Determining the electric-field strength in a passive film via photo-induced electric fields', Corrosion Science, vol. 154, pp. 239-245. https://doi.org/10.1016/j.corsci.2019.04.015

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Mao, Feixiong ; Yao, Jizheng ; Zhou, Yuting ; Dong, Chaofang ; Kursten, Bruno ; Macdonald, Digby. / Determining the electric-field strength in a passive film via photo-induced electric fields. In: Corrosion Science. 2019 ; Vol. 154. pp. 239-245.

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@article{9fdfbdcf9e9949629a3ef778ec469be5,
title = "Determining the electric-field strength in a passive film via photo-induced electric fields",
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 +/- 0.1 boric-borax buffer was recorded as a function of film formation potential (1 V-SCE, 2 V-SCE, 3 V-SCE, 4 V-SCE, 5 V-SCE, 6 V-SCE) and light intensities (50, 200, 1000 mW/cm(2)). Steady state passive film thickness measurements of the passive film on tungsten indicate that super band gap, UV light suppresses the electric field in the barrier layer, and hence stimulates anodic oxide film growth. The data obtained in this study demonstrate that the electric field strength in the steady state is independent of the applied potential and film thickness, as postulated in the Point Defect Model.",
keywords = "Passive film, Electric-field strength, Photo-stimulated growth, Point defect model",
author = "Feixiong Mao and Jizheng Yao and Yuting Zhou and Chaofang Dong and Bruno Kursten and Digby Macdonald",
note = "Score=10",
year = "2019",
month = "7",
day = "1",
doi = "10.1016/j.corsci.2019.04.015",
language = "English",
volume = "154",
pages = "239--245",
journal = "Corrosion Science",
issn = "0010-938X",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Determining the electric-field strength in a passive film via photo-induced electric fields

AU - Mao, Feixiong

AU - Yao, Jizheng

AU - Zhou, Yuting

AU - Dong, Chaofang

AU - Kursten, Bruno

AU - Macdonald, Digby

N1 - Score=10

PY - 2019/7/1

Y1 - 2019/7/1

N2 - 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 +/- 0.1 boric-borax buffer was recorded as a function of film formation potential (1 V-SCE, 2 V-SCE, 3 V-SCE, 4 V-SCE, 5 V-SCE, 6 V-SCE) and light intensities (50, 200, 1000 mW/cm(2)). Steady state passive film thickness measurements of the passive film on tungsten indicate that super band gap, UV light suppresses the electric field in the barrier layer, and hence stimulates anodic oxide film growth. The data obtained in this study demonstrate that the electric field strength in the steady state is independent of the applied potential and film thickness, as postulated in the Point Defect Model.

AB - 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 +/- 0.1 boric-borax buffer was recorded as a function of film formation potential (1 V-SCE, 2 V-SCE, 3 V-SCE, 4 V-SCE, 5 V-SCE, 6 V-SCE) and light intensities (50, 200, 1000 mW/cm(2)). Steady state passive film thickness measurements of the passive film on tungsten indicate that super band gap, UV light suppresses the electric field in the barrier layer, and hence stimulates anodic oxide film growth. The data obtained in this study demonstrate that the electric field strength in the steady state is independent of the applied potential and film thickness, as postulated in the Point Defect Model.

KW - Passive film

KW - Electric-field strength

KW - Photo-stimulated growth

KW - Point defect model

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/34440033

U2 - 10.1016/j.corsci.2019.04.015

DO - 10.1016/j.corsci.2019.04.015

M3 - Article

VL - 154

SP - 239

EP - 245

JO - Corrosion Science

JF - Corrosion Science

SN - 0010-938X

ER -

ID: 5265635