Elucidating the role of hydrogen species originating from water vapor in the oxidation mechanism of cerium

Danielle Schweke; Genady Rafailov; Shimon Zalkind; Omri Azulai; Lior Rabinovitch; Shmuel Hayun

doi:https://doi.org/10.1016/j.corsci.2021.110030

Elucidating the role of hydrogen species originating from water vapor in the oxidation mechanism of cerium

Danielle Schweke, Genady Rafailov, Shimon Zalkind, Omri Azulai, Lior Rabinovitch, Shmuel Hayun

Department of Materials Engineering

Ben-Gurion University of the Negev

Research output: Contribution to journal › Article › peer-review

Abstract

The oxidation process of cerium in air (by oxygen and water vapor) is elucidated by combining structural and compositional analyses of the oxide with time. The oxide contains a high content of hydrogen, present mainly as hydroxyls in the upper part and hydride ions at the interface with the metal. The high content of hydroxyls on the oxide's surface leads to the formation of a thin hydroxide layer (Ce(OH)₃) and to an increased oxidation rate. The observed anisotropy in oxidation rate (111) < (220) < (200) is consistent with the efficiency for H₂O splitting and to the preferred paths for OH^- diffusion.

Original language	American English
Article number	110030
Journal	Corrosion Science
Volume	196
DOIs	https://doi.org/10.1016/j.corsci.2021.110030
State	Published - 1 Mar 2022

Keywords

A. Rare earth elements
C. Atmospheric corrosion
C. Hydrogen permeation
C. Interfaces
C. Oxidation

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
General Materials Science

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https://doi.org/10.1016/j.corsci.2021.110030

Cite this

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title = "Elucidating the role of hydrogen species originating from water vapor in the oxidation mechanism of cerium",

abstract = "The oxidation process of cerium in air (by oxygen and water vapor) is elucidated by combining structural and compositional analyses of the oxide with time. The oxide contains a high content of hydrogen, present mainly as hydroxyls in the upper part and hydride ions at the interface with the metal. The high content of hydroxyls on the oxide's surface leads to the formation of a thin hydroxide layer (Ce(OH)3) and to an increased oxidation rate. The observed anisotropy in oxidation rate (111) < (220) < (200) is consistent with the efficiency for H2O splitting and to the preferred paths for OH- diffusion.",

keywords = "A. Rare earth elements, C. Atmospheric corrosion, C. Hydrogen permeation, C. Interfaces, C. Oxidation",

author = "Danielle Schweke and Genady Rafailov and Shimon Zalkind and Omri Azulai and Lior Rabinovitch and Shmuel Hayun",

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T1 - Elucidating the role of hydrogen species originating from water vapor in the oxidation mechanism of cerium

AU - Schweke, Danielle

AU - Rafailov, Genady

AU - Zalkind, Shimon

AU - Azulai, Omri

AU - Rabinovitch, Lior

AU - Hayun, Shmuel

PY - 2022/3/1

Y1 - 2022/3/1

N2 - The oxidation process of cerium in air (by oxygen and water vapor) is elucidated by combining structural and compositional analyses of the oxide with time. The oxide contains a high content of hydrogen, present mainly as hydroxyls in the upper part and hydride ions at the interface with the metal. The high content of hydroxyls on the oxide's surface leads to the formation of a thin hydroxide layer (Ce(OH)3) and to an increased oxidation rate. The observed anisotropy in oxidation rate (111) < (220) < (200) is consistent with the efficiency for H2O splitting and to the preferred paths for OH- diffusion.

AB - The oxidation process of cerium in air (by oxygen and water vapor) is elucidated by combining structural and compositional analyses of the oxide with time. The oxide contains a high content of hydrogen, present mainly as hydroxyls in the upper part and hydride ions at the interface with the metal. The high content of hydroxyls on the oxide's surface leads to the formation of a thin hydroxide layer (Ce(OH)3) and to an increased oxidation rate. The observed anisotropy in oxidation rate (111) < (220) < (200) is consistent with the efficiency for H2O splitting and to the preferred paths for OH- diffusion.

KW - A. Rare earth elements

KW - C. Atmospheric corrosion

KW - C. Hydrogen permeation

KW - C. Interfaces

KW - C. Oxidation

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SN - 0010-938X

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JO - Corrosion Science

JF - Corrosion Science

M1 - 110030

ER -

Elucidating the role of hydrogen species originating from water vapor in the oxidation mechanism of cerium

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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