Oxygen Electrode Kinetics and Surface Composition of Dense (La0.75Sr0.25)0.95MnO3 on YSZ

Yuehua Wu; Karin Vels Hansen; Kion Norrman; Torben Jacobsen; Mogens Bjerg Mogensen

doi:10.1149/05701.1673ecst

Oxygen Electrode Kinetics and Surface Composition of Dense (La_0.75Sr_0.25)_0.95MnO₃ on YSZ

Yuehua Wu, Karin Vels Hansen, Kion Norrman, Torben Jacobsen, Mogens Bjerg Mogensen

Department of Energy Conversion and Storage

Research output: Contribution to journal › Conference article › Research › peer-review

534 Downloads (Pure)

Abstract

Lanthanum strontium manganate (LSM) micro-electrodes with the nominal composition of (La0.75Sr0.25)0.95MnO3 were deposited on yttria stabilized zirconia (YSZ). The diameter varied from 20 –
100 m and the thickness was kept constant at ca. 0.5 m. Electrochemical characterization was carried out in situ at temperatures from 660 to 860 C using a controlled atmosphere high temperature scanning probe microscope (CAHT-SPM) setup for measurements of impedance spectroscopy and potential sweep. The oxygen partial pressure, pO2, was varied. Further, ex situ surface analysis by time of flight secondary ion mass spectrometry (TOF-SIMS) and structure examination by scanning electron microscopy (SEM) were performed. Segregation of Sr and La oxides to LSM surfaces and Mn rich oxide to the three phase boundary (TPB) was observed. YSZ and LSM attract different oxides/impurities. The oxygen electrode kinetics are discussed in light of the surface compositions and compared with the literature on microelectrode and composite LSM-YSZ electrode kinetics.

Original language	English
Journal	E C S Transactions
Volume	57
Issue number	1
Pages (from-to)	1673-1682
ISSN	1938-5862
DOIs	https://doi.org/10.1149/05701.1673ecst
Publication status	Published - 2013
Event	13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII) - Okinawa, Japan Duration: 6 Oct 2013 → 11 Oct 2013 Conference number: 13

Conference

Conference	13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII)
Number	13
Country/Territory	Japan
City	Okinawa
Period	06/10/2013 → 11/10/2013

Access to Document

10.1149/05701.1673ecst

Oxygen Electrode KineticsFinal published version, 1.57 MB

OpenUrl availability

Full text

Cite this

@inproceedings{97fb2f1715f943f2980eaa659b0ec434,

title = "Oxygen Electrode Kinetics and Surface Composition of Dense (La0.75Sr0.25)0.95MnO3 on YSZ",

abstract = "Lanthanum strontium manganate (LSM) micro-electrodes with the nominal composition of (La0.75Sr0.25)0.95MnO3 were deposited on yttria stabilized zirconia (YSZ). The diameter varied from 20 –100 m and the thickness was kept constant at ca. 0.5 m. Electrochemical characterization was carried out in situ at temperatures from 660 to 860 C using a controlled atmosphere high temperature scanning probe microscope (CAHT-SPM) setup for measurements of impedance spectroscopy and potential sweep. The oxygen partial pressure, pO2, was varied. Further, ex situ surface analysis by time of flight secondary ion mass spectrometry (TOF-SIMS) and structure examination by scanning electron microscopy (SEM) were performed. Segregation of Sr and La oxides to LSM surfaces and Mn rich oxide to the three phase boundary (TPB) was observed. YSZ and LSM attract different oxides/impurities. The oxygen electrode kinetics are discussed in light of the surface compositions and compared with the literature on microelectrode and composite LSM-YSZ electrode kinetics.",

author = "Yuehua Wu and Hansen, {Karin Vels} and Kion Norrman and Torben Jacobsen and Mogensen, {Mogens Bjerg}",

year = "2013",

doi = "10.1149/05701.1673ecst",

language = "English",

volume = "57",

pages = "1673--1682",

journal = "E C S Transactions",

issn = "1938-5862",

publisher = "The Electrochemical Society",

number = "1",

note = "13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII), SOFC ; Conference date: 06-10-2013 Through 11-10-2013",

}

TY - GEN

T1 - Oxygen Electrode Kinetics and Surface Composition of Dense (La0.75Sr0.25)0.95MnO3 on YSZ

AU - Wu, Yuehua

AU - Hansen, Karin Vels

AU - Norrman, Kion

AU - Jacobsen, Torben

AU - Mogensen, Mogens Bjerg

N1 - Conference code: 13

PY - 2013

Y1 - 2013

N2 - Lanthanum strontium manganate (LSM) micro-electrodes with the nominal composition of (La0.75Sr0.25)0.95MnO3 were deposited on yttria stabilized zirconia (YSZ). The diameter varied from 20 –100 m and the thickness was kept constant at ca. 0.5 m. Electrochemical characterization was carried out in situ at temperatures from 660 to 860 C using a controlled atmosphere high temperature scanning probe microscope (CAHT-SPM) setup for measurements of impedance spectroscopy and potential sweep. The oxygen partial pressure, pO2, was varied. Further, ex situ surface analysis by time of flight secondary ion mass spectrometry (TOF-SIMS) and structure examination by scanning electron microscopy (SEM) were performed. Segregation of Sr and La oxides to LSM surfaces and Mn rich oxide to the three phase boundary (TPB) was observed. YSZ and LSM attract different oxides/impurities. The oxygen electrode kinetics are discussed in light of the surface compositions and compared with the literature on microelectrode and composite LSM-YSZ electrode kinetics.

AB - Lanthanum strontium manganate (LSM) micro-electrodes with the nominal composition of (La0.75Sr0.25)0.95MnO3 were deposited on yttria stabilized zirconia (YSZ). The diameter varied from 20 –100 m and the thickness was kept constant at ca. 0.5 m. Electrochemical characterization was carried out in situ at temperatures from 660 to 860 C using a controlled atmosphere high temperature scanning probe microscope (CAHT-SPM) setup for measurements of impedance spectroscopy and potential sweep. The oxygen partial pressure, pO2, was varied. Further, ex situ surface analysis by time of flight secondary ion mass spectrometry (TOF-SIMS) and structure examination by scanning electron microscopy (SEM) were performed. Segregation of Sr and La oxides to LSM surfaces and Mn rich oxide to the three phase boundary (TPB) was observed. YSZ and LSM attract different oxides/impurities. The oxygen electrode kinetics are discussed in light of the surface compositions and compared with the literature on microelectrode and composite LSM-YSZ electrode kinetics.

U2 - 10.1149/05701.1673ecst

DO - 10.1149/05701.1673ecst

M3 - Conference article

SN - 1938-5862

VL - 57

SP - 1673

EP - 1682

JO - E C S Transactions

JF - E C S Transactions

IS - 1

T2 - 13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII)

Y2 - 6 October 2013 through 11 October 2013

ER -