Oxygen electrode kinetics and surface composition of dense (La 0.75Sr0.25)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

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Lanthanum strontium manganate (LSM) micro-electrodes with the nominal composition of (La_0.75Sr_0.25)0.95MnO₃ were deposited on yttria stabilized zirconia (YSZ). The diameter varied from 20 - 100 μm and the thickness was kept constant at ca. 0.5 μm. 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
Pages (from-to)	1673-1682
Number of pages	10
Journal	ECS Transactions
Volume	57
Issue number	1
DOIs	https://doi.org/10.1149/05701.1673ecst
State	Published - 2013
Externally published	Yes

ASJC Scopus subject areas

General Engineering

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10.1149/05701.1673ecst

Cite this

@article{f940dba473774448933d73cdf97f850f,

title = "Oxygen electrode kinetics and surface composition of dense (La 0.75Sr0.25)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 μm and the thickness was kept constant at ca. 0.5 μm. 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 = "ECS Transactions",

issn = "1938-5862",

publisher = "Electrochemical Society, Inc.",

number = "1",

}

TY - JOUR

T1 - Oxygen electrode kinetics and surface composition of dense (La 0.75Sr0.25)0.95MnO3 on YSZ

AU - Wu, Yuehua

AU - Hansen, Karin Vels

AU - Norrman, Kion

AU - Jacobsen, Torben

AU - Mogensen, Mogens Bjerg

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 μm and the thickness was kept constant at ca. 0.5 μm. 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 μm and the thickness was kept constant at ca. 0.5 μm. 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.

UR - https://www.scopus.com/pages/publications/84905061334

U2 - 10.1149/05701.1673ecst

DO - 10.1149/05701.1673ecst

M3 - Article

AN - SCOPUS:84905061334

SN - 1938-5862

VL - 57

SP - 1673

EP - 1682

JO - ECS Transactions

JF - ECS Transactions

IS - 1