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Title: Electrochemically-Controlled Compositional Oscillations of Oxide Surfaces

Abstract

Perovskite oxides can exhibit a wide range of interesting characteristics such as being catalytically active and electronically and/or ionically conducting, and thus they have been used in a number of solid-state devices such as solid oxide fuel cells and sensors. As the surface compositions of perovskites can greatly influence the catalytic properties, knowing and controlling their surface chemistries 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 chemistry changes of La0.8Sr0.2CoO3 (LSC113), LaSrCoO4 (LSC214), and LSC214-decorated LSC113 films (LSC113/214) were investigated in situ by utilizing synchrotron-based X-ray photoelectron spectroscopy (XPS), where the largest changes of surface Sr was found for the LSC113/214 surface. These findings offer the potential of reversibly controlling the surface functionality of perovskites.

Authors:
 [1];  [1];  [2];  [2];  [3];  [4];  [5];  [5];  [4];  [2];  [1]
  1. Massachusetts Institute of Technology (MIT)
  2. Institute of Physical Chemistry, Justus-Liebig-University Giessen
  3. Sincrotrone Trieste Elettra
  4. Sincrotrone Trieste, Basovizza, Italy
  5. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1052245
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Energy & Environmental Science
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
Surfaces; Interfaces; Catalysis

Citation Formats

Mutoro, Eva, Crumlin, Ethan, Pöpke, Hendrik, Luerssen, Bjoern, Amati, Matteo, Abyaneh, Majid, Biegalski, Michael D, Christen, Hans M, Gregoratti, Luca, Janek, Jürgen, and Shao-Horn, Yang. Electrochemically-Controlled Compositional Oscillations of Oxide Surfaces. United States: N. p., 2012. Web.
Mutoro, Eva, Crumlin, Ethan, Pöpke, Hendrik, Luerssen, Bjoern, Amati, Matteo, Abyaneh, Majid, Biegalski, Michael D, Christen, Hans M, Gregoratti, Luca, Janek, Jürgen, & Shao-Horn, Yang. Electrochemically-Controlled Compositional Oscillations of Oxide Surfaces. United States.
Mutoro, Eva, Crumlin, Ethan, Pöpke, Hendrik, Luerssen, Bjoern, Amati, Matteo, Abyaneh, Majid, Biegalski, Michael D, Christen, Hans M, Gregoratti, Luca, Janek, Jürgen, and Shao-Horn, Yang. 2012. "Electrochemically-Controlled Compositional Oscillations of Oxide Surfaces". United States.
@article{osti_1052245,
title = {Electrochemically-Controlled Compositional Oscillations of Oxide Surfaces},
author = {Mutoro, Eva and Crumlin, Ethan and Pöpke, Hendrik and Luerssen, Bjoern and Amati, Matteo and Abyaneh, Majid and Biegalski, Michael D and Christen, Hans M and Gregoratti, Luca and Janek, Jürgen and Shao-Horn, Yang},
abstractNote = {Perovskite oxides can exhibit a wide range of interesting characteristics such as being catalytically active and electronically and/or ionically conducting, and thus they have been used in a number of solid-state devices such as solid oxide fuel cells and sensors. As the surface compositions of perovskites can greatly influence the catalytic properties, knowing and controlling their surface chemistries 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 chemistry changes of La0.8Sr0.2CoO3 (LSC113), LaSrCoO4 (LSC214), and LSC214-decorated LSC113 films (LSC113/214) were investigated in situ by utilizing synchrotron-based X-ray photoelectron spectroscopy (XPS), where the largest changes of surface Sr was found for the LSC113/214 surface. These findings offer the potential of reversibly controlling the surface functionality of perovskites.},
doi = {},
url = {https://www.osti.gov/biblio/1052245}, journal = {Energy & Environmental Science},
number = 1,
volume = 3,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2012},
month = {Sun Jan 01 00:00:00 EST 2012}
}