In situ x-ray, electrochemical, and modeling investigation of the oxygen electrode activation.

Yildiz, B; Chang, K -C; Meyers, D; Carter, J D; You, H

Title: In situ x-ray, electrochemical, and modeling investigation of the oxygen electrode activation.

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Abstract

Oxygen electrodes of solid oxide electrochemical cells have been shown to improve under strong cathodic and anodic polarization. Our study investigates the mechanism causing such improvement, using in situ x-ray and electrochemical characterization and electrochemical impedance modeling of the oxygen electrodes. Several porous and dense thin-film model electrodes of La{sub 0.8}Sr{sub 0.2}MnO{sub 3} (LSM) and La{sub 0.8}Sr{sub 0.2}MnO{sub 3} (LCM) on single crystal yttria-stabilized zirconia (YSZ) electrolytes have been analyzed in situ at the Advanced Photon Source (APS) using x-ray reflectivity and x-ray absorption near edge spectroscopy (XANES) at the Mn K-edge and La LII-edge. In situ x-ray reflectivity analysis show that no clear correlation between the polarization of the electrode and any further changes in the roughness of the LSM/YSZ interface exist. XANES measurements illustrate that the cathodic or anodic dc polarization at high temperature induces no detectable changes in Mn chemical state either in the bulk or at the surface of the LCM and LSM electrodes on YSZ, while the La chemical state changes reversibly at the electrode surface. This field-induced chemical change of La at the surface of electrodes is assumed to be a cause of the electrochemical activation through enhanced surface exchange of oxygen on themore » doped lanthanum manganite electrodes.« less

Authors:: Yildiz, B; Chang, K -C; Meyers, D; Carter, J D; You, H

Publication Date:: Sun Jan 01 00:00:00 EST 2006

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 982328

Report Number(s):: ANL/NE/CP-57617
TRN: US201013%%1006

DOE Contract Number:: DE-AC02-06CH11357

Resource Type:: Conference

Resource Relation:: Conference: 7th European Solid Oxide Fuel Cell Forum; Jul. 3, 2006 - Jul. 7, 2006; Luzern, Switzerland

Country of Publication:: United States

Language:: ENGLISH

Subject:: 30 DIRECT ENERGY CONVERSION; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION; ADVANCED PHOTON SOURCE; CHEMICAL STATE; CORRELATIONS; ELECTROCHEMICAL CELLS; ELECTRODES; ELECTROLYTES; IMPEDANCE; INTERFACES; LANTHANUM; MONOCRYSTALS; OXIDES; OXYGEN; POLARIZATION; REFLECTIVITY; ROUGHNESS; SIMULATION; SOLID OXIDE FUEL CELLS; SOLIDS; SPECTROSCOPY; TEMPERATURE RANGE 0400-1000 K

Citation Formats


                    Yildiz, B, Chang, K -C, Meyers, D, Carter, J D, and You, H. In situ x-ray, electrochemical, and modeling investigation of the oxygen electrode activation..  United States: N. p., 2006. 
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                    Yildiz, B, Chang, K -C, Meyers, D, Carter, J D, & You, H. In situ x-ray, electrochemical, and modeling investigation of the oxygen electrode activation..  United States.

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                    Yildiz, B, Chang, K -C, Meyers, D, Carter, J D, and You, H. 2006.  
        "In situ x-ray, electrochemical, and modeling investigation of the oxygen electrode activation.".  United States.

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@article{osti_982328,

  title        = {In situ x-ray, electrochemical, and modeling investigation of the oxygen electrode activation.},

  author       = {Yildiz, B and Chang, K -C and Meyers, D and Carter, J D and You, H},

  abstractNote = {Oxygen electrodes of solid oxide electrochemical cells have been shown to improve under strong cathodic and anodic polarization. Our study investigates the mechanism causing such improvement, using in situ x-ray and electrochemical characterization and electrochemical impedance modeling of the oxygen electrodes. Several porous and dense thin-film model electrodes of La{sub 0.8}Sr{sub 0.2}MnO{sub 3} (LSM) and La{sub 0.8}Sr{sub 0.2}MnO{sub 3} (LCM) on single crystal yttria-stabilized zirconia (YSZ) electrolytes have been analyzed in situ at the Advanced Photon Source (APS) using x-ray reflectivity and x-ray absorption near edge spectroscopy (XANES) at the Mn K-edge and La LII-edge. In situ x-ray reflectivity analysis show that no clear correlation between the polarization of the electrode and any further changes in the roughness of the LSM/YSZ interface exist. XANES measurements illustrate that the cathodic or anodic dc polarization at high temperature induces no detectable changes in Mn chemical state either in the bulk or at the surface of the LCM and LSM electrodes on YSZ, while the La chemical state changes reversibly at the electrode surface. This field-induced chemical change of La at the surface of electrodes is assumed to be a cause of the electrochemical activation through enhanced surface exchange of oxygen on the doped lanthanum manganite electrodes.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/982328},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sun Jan 01 00:00:00 EST 2006},

  month        = {Sun Jan 01 00:00:00 EST 2006}

}

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