Journal article

Publication year: 2012

Pages: 40-44

Journal: Journal of Physical Chemistry Letters

Volume number: 3

Issue number: 1

ISSN: 1948-7185

eISSN: 1948-7185

DOI Link: https://doi.org/10.1021/jz201523y

Publisher: American Chemical Society

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(0.8)Sr(0.2),CoO(3-delta)(LSC(113)), (La(0.5)Sr(0.5))(2)CoO(4 +/-delta) (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.

Harvard Citation style: Mutoro, E., Crumlin, E., Pöpke, H., Luerssen, B., Amati, M., Abyaneh, M., et al. (2012) Reversible Compositional Control of Oxide Surfaces by Electrochemical Potentials, Journal of Physical Chemistry Letters, 3(1), pp. 40-44. https://doi.org/10.1021/jz201523y

APA Citation style: Mutoro, E., Crumlin, E., Pöpke, H., Luerssen, B., Amati, M., Abyaneh, M., Biegalski, M., Christen, H., Gregoratti, L., Janek, J., & Shao-Horn, Y. (2012). Reversible Compositional Control of Oxide Surfaces by Electrochemical Potentials. Journal of Physical Chemistry Letters. 3(1), 40-44. https://doi.org/10.1021/jz201523y