Reversible Compositional Control of Oxide Surfaces by Electrochemical Potentials

Eva Mutoro; Ethan J. Crumlin; Hendrik Pöpke; Bjoern Luerssen; Matteo Amati; Majid K. Abyaneh; Michael D. Biegalski; Hans M. Christen; Luca Gregoratti; Jürgen Janek; Yang Shao-Horn

doi:10.1021/jz201523y

Reversible Compositional Control of Oxide Surfaces by Electrochemical Potentials

Eva Mutoro, Ethan J. Crumlin, Hendrik Pöpke, Bjoern Luerssen, Matteo Amati, Majid K. Abyaneh, Michael D. Biegalski, Hans M. Christen, Luca Gregoratti, Jürgen Janek, Yang Shao-Horn

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Abstract

Perovskite oxides can exhibit a wide range of interesting characteristics such as being catalytically active and electronically/ionically conducting, and thus, they have been used in a number of solid-state devices such as solid oxide fuel cells (SOFCs) and sensors. As the surface compositions of perovskites can greatly influence the catalytic properties, knowing and controlling their surface compositions is crucial to enhance device performance. In this study, we demonstrate that the surface strontium (Sr) and cobalt (Co) concentrations of perovskite-based thin films can be controlled reversibly at elevated temperatures by applying small electrical potential biases. The surface compositional changes of La 0.8Sr 0.2CoO 3-δ (LSC 113), (La 0.5Sr 0.5) 2CoO 4±δ (LSC 214), and LSC 214-decorated LSC 113 films (LSC 113/214) were investigated in situ by utilizing synchrotron-based X-ray photoelectron spectroscopy (XPS), where the largest changes of surface Sr were found for the LSC 113/214 surface. These findings offer the potential of reversibly controlling the surface functionality of perovskites. © 2011 American Chemical Society.

Original language	English (US)
Pages (from-to)	40-44
Number of pages	5
Journal	The Journal of Physical Chemistry Letters
Volume	3
Issue number	1
DOIs	https://doi.org/10.1021/jz201523y
State	Published - Dec 13 2011
Externally published	Yes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported in part by DOE (SISGR DESC0002633), King Abdullah University of Science and Technology, and the King Fahd University of Petroleum and Minerals in Dharam (through the Center for Clean Water and Clean Energy at MIT and KFUPM). The German Research Foundation is acknowledged for financial support (E.M.: DFG research scholarship; H.P., B.L., and J.J.: LU1480/1-1 and JA648/17-1). The sample preparation performed at the Center of Nanophase Materials Sciences was sponsored by the Scientific User Facilities Division, Office of Basic Energy Science, U.S. DOE.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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10.1021/jz201523y

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@article{657e61062a424d66b51724ab42bf1714,

title = "Reversible Compositional Control of Oxide Surfaces by Electrochemical Potentials",

abstract = "Perovskite oxides can exhibit a wide range of interesting characteristics such as being catalytically active and electronically/ionically conducting, and thus, they have been used in a number of solid-state devices such as solid oxide fuel cells (SOFCs) and sensors. As the surface compositions of perovskites can greatly influence the catalytic properties, knowing and controlling their surface compositions is crucial to enhance device performance. In this study, we demonstrate that the surface strontium (Sr) and cobalt (Co) concentrations of perovskite-based thin films can be controlled reversibly at elevated temperatures by applying small electrical potential biases. The surface compositional changes of La 0.8Sr 0.2CoO 3-δ (LSC 113), (La 0.5Sr 0.5) 2CoO 4±δ (LSC 214), and LSC 214-decorated LSC 113 films (LSC 113/214) were investigated in situ by utilizing synchrotron-based X-ray photoelectron spectroscopy (XPS), where the largest changes of surface Sr were found for the LSC 113/214 surface. These findings offer the potential of reversibly controlling the surface functionality of perovskites. {\textcopyright} 2011 American Chemical Society.",

author = "Eva Mutoro and Crumlin, {Ethan J.} and Hendrik P{\"o}pke and Bjoern Luerssen and Matteo Amati and Abyaneh, {Majid K.} and Biegalski, {Michael D.} and Christen, {Hans M.} and Luca Gregoratti and J{\"u}rgen Janek and Yang Shao-Horn",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: This work was supported in part by DOE (SISGR DESC0002633), King Abdullah University of Science and Technology, and the King Fahd University of Petroleum and Minerals in Dharam (through the Center for Clean Water and Clean Energy at MIT and KFUPM). The German Research Foundation is acknowledged for financial support (E.M.: DFG research scholarship; H.P., B.L., and J.J.: LU1480/1-1 and JA648/17-1). The sample preparation performed at the Center of Nanophase Materials Sciences was sponsored by the Scientific User Facilities Division, Office of Basic Energy Science, U.S. DOE. This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

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doi = "10.1021/jz201523y",

language = "English (US)",

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T1 - Reversible Compositional Control of Oxide Surfaces by Electrochemical Potentials

AU - Mutoro, Eva

AU - Crumlin, Ethan J.

AU - Pöpke, Hendrik

AU - Luerssen, Bjoern

AU - Amati, Matteo

AU - Abyaneh, Majid K.

AU - Biegalski, Michael D.

AU - Christen, Hans M.

AU - Gregoratti, Luca

AU - Janek, Jürgen

AU - Shao-Horn, Yang

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: This work was supported in part by DOE (SISGR DESC0002633), King Abdullah University of Science and Technology, and the King Fahd University of Petroleum and Minerals in Dharam (through the Center for Clean Water and Clean Energy at MIT and KFUPM). The German Research Foundation is acknowledged for financial support (E.M.: DFG research scholarship; H.P., B.L., and J.J.: LU1480/1-1 and JA648/17-1). The sample preparation performed at the Center of Nanophase Materials Sciences was sponsored by the Scientific User Facilities Division, Office of Basic Energy Science, U.S. DOE. This publication acknowledges KAUST support, but has no KAUST affiliated authors.

PY - 2011/12/13

Y1 - 2011/12/13

N2 - Perovskite oxides can exhibit a wide range of interesting characteristics such as being catalytically active and electronically/ionically conducting, and thus, they have been used in a number of solid-state devices such as solid oxide fuel cells (SOFCs) and sensors. As the surface compositions of perovskites can greatly influence the catalytic properties, knowing and controlling their surface compositions is crucial to enhance device performance. In this study, we demonstrate that the surface strontium (Sr) and cobalt (Co) concentrations of perovskite-based thin films can be controlled reversibly at elevated temperatures by applying small electrical potential biases. The surface compositional changes of La 0.8Sr 0.2CoO 3-δ (LSC 113), (La 0.5Sr 0.5) 2CoO 4±δ (LSC 214), and LSC 214-decorated LSC 113 films (LSC 113/214) were investigated in situ by utilizing synchrotron-based X-ray photoelectron spectroscopy (XPS), where the largest changes of surface Sr were found for the LSC 113/214 surface. These findings offer the potential of reversibly controlling the surface functionality of perovskites. © 2011 American Chemical Society.

AB - Perovskite oxides can exhibit a wide range of interesting characteristics such as being catalytically active and electronically/ionically conducting, and thus, they have been used in a number of solid-state devices such as solid oxide fuel cells (SOFCs) and sensors. As the surface compositions of perovskites can greatly influence the catalytic properties, knowing and controlling their surface compositions is crucial to enhance device performance. In this study, we demonstrate that the surface strontium (Sr) and cobalt (Co) concentrations of perovskite-based thin films can be controlled reversibly at elevated temperatures by applying small electrical potential biases. The surface compositional changes of La 0.8Sr 0.2CoO 3-δ (LSC 113), (La 0.5Sr 0.5) 2CoO 4±δ (LSC 214), and LSC 214-decorated LSC 113 films (LSC 113/214) were investigated in situ by utilizing synchrotron-based X-ray photoelectron spectroscopy (XPS), where the largest changes of surface Sr were found for the LSC 113/214 surface. These findings offer the potential of reversibly controlling the surface functionality of perovskites. © 2011 American Chemical Society.

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UR - https://pubs.acs.org/doi/10.1021/jz201523y

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DO - 10.1021/jz201523y

M3 - Article

SN - 1948-7185

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SP - 40

EP - 44

JO - The Journal of Physical Chemistry Letters

JF - The Journal of Physical Chemistry Letters

IS - 1

ER -

Reversible Compositional Control of Oxide Surfaces by Electrochemical Potentials

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