Experimental Design for Voltage Driven Tracer Incorporation and Diffusion Studies on Oxide Thin Film Electrodes. Issue 7 (16th May 2017)

• Record Type: Journal Article
• Authors: Huber, Tobias M.; Navickas, Edvinas; Sasaki, Kazunari; Yildiz, Bilge; Tuller, Harry; Friedbacher, Gernot; Hutter, Herbert; Fleig, Juergen
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 7(2017)
• Page Start: F809
• Page End: F814
• Publication Date: 2017-05-16
• Subjects: cathodic bias -- grain boundaries -- LSM thin films -- SIMS -- tracer diffusion; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0711707jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The effect of an applied overpotential on oxygen isotope incorporation and diffusion in oxide thin film electrodes is investigated by a novel experimental approach. A special electrode geometry leads to in-plane electron flow, perpendicular oxide ion flow and a well-defined laterally varying driving force. This design allows one to obtain a series of tracer depth profiles induced by a range of overpotentials on one and the same thin film. The approach was applied to La0.8 Sr0.2 MnO3 (LSM) thin films deposited by pulsed laser deposition (PLD) on yttria stabilized zirconia (YSZ) single crystals. Tracer depth profiles were measured by secondary ion mass spectrometry (SIMS). These depth profiles include examples of pronounced apparent uphill diffusion that can be explained by considering an interplay of polarization-induced changes in stoichiometry within the LSM grains combined with fast oxygen transport along the grain boundaries.