The oxidation of carbon on nickel: Effects of surface morphology

F. A. List; J. M. Blakely

doi:10.1016/0167-577X(82)90017-9

The oxidation of carbon on nickel: Effects of surface morphology

F. A. List, J. M. Blakely

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Abstract

The thermal desorption of CO from nickel surfaces has been used to follow the interaction of carbon with oxygen. The CO desorption spectrum subsequent to oxygen exposure of an initially clean nickel surface exhibits three principal peaks denoted as α, β₁, and β₂. The low-temperature a peak is believed to correspond to the desorption of molecularly adsorbed CO. The high-temperature β₂ peak is due to the desorption of CO formed by surface combination of dissociatively adsorbed oxygen and carbon diffusing from the crystal interior. The intermediate-temperature β₁ peak is also believed to be due to CO formed by combination of O and C at the surface. Evidence suggests that the surface carbon contributing to the β₁ peak arises from the segregation of carbon from the bulk to the surface before or during oxygen exposure. The β₁ peak is very sensitive to surface orientation and is, in particular, significantly enhanced as the degree of atomic surface roughness increases. These results are discussed in terms of preferential carbon segregation to surface defect sites.

Original language	English
Pages (from-to)	95-99
Number of pages	5
Journal	Materials Letters
Volume	1
Issue number	3-4
DOIs	https://doi.org/10.1016/0167-577X(82)90017-9
State	Published - Dec 1982
Externally published	Yes

Funding

*Work supported by the National Science Foundation, grant number DMR-7926443, and by the Materials Science Center at Cornell University.

Funders	Funder number
Materials Science Center at Cornell University
National Science Foundation	DMR-7926443

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10.1016/0167-577X(82)90017-9

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title = "The oxidation of carbon on nickel: Effects of surface morphology",

abstract = "The thermal desorption of CO from nickel surfaces has been used to follow the interaction of carbon with oxygen. The CO desorption spectrum subsequent to oxygen exposure of an initially clean nickel surface exhibits three principal peaks denoted as α, β1, and β2. The low-temperature a peak is believed to correspond to the desorption of molecularly adsorbed CO. The high-temperature β2 peak is due to the desorption of CO formed by surface combination of dissociatively adsorbed oxygen and carbon diffusing from the crystal interior. The intermediate-temperature β1 peak is also believed to be due to CO formed by combination of O and C at the surface. Evidence suggests that the surface carbon contributing to the β1 peak arises from the segregation of carbon from the bulk to the surface before or during oxygen exposure. The β1 peak is very sensitive to surface orientation and is, in particular, significantly enhanced as the degree of atomic surface roughness increases. These results are discussed in terms of preferential carbon segregation to surface defect sites.",

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T1 - The oxidation of carbon on nickel

T2 - Effects of surface morphology

AU - List, F. A.

AU - Blakely, J. M.

PY - 1982/12

Y1 - 1982/12

N2 - The thermal desorption of CO from nickel surfaces has been used to follow the interaction of carbon with oxygen. The CO desorption spectrum subsequent to oxygen exposure of an initially clean nickel surface exhibits three principal peaks denoted as α, β1, and β2. The low-temperature a peak is believed to correspond to the desorption of molecularly adsorbed CO. The high-temperature β2 peak is due to the desorption of CO formed by surface combination of dissociatively adsorbed oxygen and carbon diffusing from the crystal interior. The intermediate-temperature β1 peak is also believed to be due to CO formed by combination of O and C at the surface. Evidence suggests that the surface carbon contributing to the β1 peak arises from the segregation of carbon from the bulk to the surface before or during oxygen exposure. The β1 peak is very sensitive to surface orientation and is, in particular, significantly enhanced as the degree of atomic surface roughness increases. These results are discussed in terms of preferential carbon segregation to surface defect sites.

AB - The thermal desorption of CO from nickel surfaces has been used to follow the interaction of carbon with oxygen. The CO desorption spectrum subsequent to oxygen exposure of an initially clean nickel surface exhibits three principal peaks denoted as α, β1, and β2. The low-temperature a peak is believed to correspond to the desorption of molecularly adsorbed CO. The high-temperature β2 peak is due to the desorption of CO formed by surface combination of dissociatively adsorbed oxygen and carbon diffusing from the crystal interior. The intermediate-temperature β1 peak is also believed to be due to CO formed by combination of O and C at the surface. Evidence suggests that the surface carbon contributing to the β1 peak arises from the segregation of carbon from the bulk to the surface before or during oxygen exposure. The β1 peak is very sensitive to surface orientation and is, in particular, significantly enhanced as the degree of atomic surface roughness increases. These results are discussed in terms of preferential carbon segregation to surface defect sites.

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The oxidation of carbon on nickel: Effects of surface morphology

Abstract

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