Journalartikel

Jahr der Veröffentlichung: 2012

Seiten: 40-44

Zeitschrift: Journal of Physical Chemistry Letters

Bandnummer: 3

Heftnummer: 1

ISSN: 1948-7185

eISSN: 1948-7185

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

Verlag: 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-Zitierstil: 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-Zitierstil: 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