Microstructural and microchemical characterization of the interface between La0.85Sr0.15MnO3 and Y2O3-stabilized ZrO2

Clausen, C.; Bagger, C.; Bilde-Sørensen, Jørgen; Horsewell, A.

doi:10.1016/0167-2738(94)90287-9

Cited by 71 publications

(50 citation statements)

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“…[25][26][27] Chen et al study the thermal stability and reactivity between LSM and YSZ in LSM/YSZ composites using in situ neutron diffraction technique. 28 The results indicate that the reaction between LSM and YSZ starts at 1100…”

mentioning

confidence: 99%

“…20 The interface between LSM and YSZ is further complicated by the reactivity and ionic inter-diffusion between LSM and YSZ during the high temperature sintering process or under SOFC operation conditions. [25][26][27] Chen et al study the thermal stability and reactivity between LSM and YSZ in LSM/YSZ composites using in situ neutron diffraction technique. 28 The results indicate that the reaction between LSM and YSZ starts at 1100…”

mentioning

confidence: 99%

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Thermally and Electrochemically Induced Electrode/Electrolyte Interfaces in Solid Oxide Fuel Cells: An AFM and EIS Study

Jiang

2015

J. Electrochem. Soc.

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In high temperature solid oxide fuel cells (SOFCs), electrode/electrolyte interfaces play a critical role in the electrocatalytic activity and durability of the cells. In this study, thermally and electrochemically induced electrode/electrolyte interfaces were investigated on pre-sintered and in situ assembled (La 0.8 Sr 0.2 ) 0.90 MnO 3 (LSM) and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) electrodes on Y 2 O 3 -ZrO 2 (YSZ) and Gd 0.2 Ce 0.8 O 2 (GDC) electrolytes, using atomic force microscopy (AFM) and electrochemical impedance spectroscopy (EIS). The results indicate that thermally induced interface is characterized by convex contact rings with depth of 100-400 nm and diameter in agreement with the particle size of pre-sintered LSM and LSCF electrodes, while the electrochemically induced interfaces under cathodic polarization conditions on in situ assembled electrodes are characterized by particle-shaped contact marks or clusters (50-100 nm in diameter). The number and distribution of contact clusters depend on the cathodic current density as well as the electrode and electrolyte materials. The contact clusters on the in situ assembled LSCF/GDC interface are substantially smaller than that on the in situ assembled LSM/GDC interface likely due to the high mixed ionic and electronic conductivities of LSCF materials. The results show that the electrochemically induced interface is most likely resulting from the incorporation of oxygen species and cation interdiffusion under cathodic polarization conditions. However, the electrocatalytic activity of electrochemically induced electrode/electrolyte interfaces is comparable to the thermally induced interfaces for the O 2 reduction reaction under SOFC operation conditions. © The Author Solid oxide fuel cell (SOFC) is one of the most efficient technologies for the conversion of chemical energy of fuels such as hydrogen and natural gas directly into electrical power. It employs a solid oxide electrolyte such as yttria-stabilized zirconia (YSZ) that serves as an ionic conductor in the temperature range between 600• C to 1000• C. The electrolyte separates the cathode from the anode and conducts oxygen ions from the cathode to the anode where they react electrochemically with the fuel. Electrons are then released to an external circuit, which provides a useful source of electrical power. The electrochemical reactions such as O 2 reduction at the cathode and H 2 oxidation at the anodes occur at the electrode/electrolyte interface regions.1-3 Thus, in SOFCs, electrode/electrolyte interfaces play a vital role in the mechanism and kinetics of the electrochemical reactions and in the fundamental understanding of the relationship between the electrochemical processes and microstructure.4-10 The cell performance and durability also depend strongly on the microstructural change at the interface under SOFC operation conditions. 11,12Lanthanum strontium manganite (LSM) is one of the most common cathode materials for SOFCs because of high electrical conductivity, good thermal and chem...

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confidence: 99%

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confidence: 99%

Thermally and Electrochemically Induced Electrode/Electrolyte Interfaces in Solid Oxide Fuel Cells: An AFM and EIS Study

Jiang

2015

J. Electrochem. Soc.

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“…The electrolyte electronic conductivity is in the range of 30-40 cm 2 . Simulations have been performed for the case of a single repeat element (non-adiabatic case) and the case of a repeat element in a stack (adiabatic case).…”

Section: Counter-flow Repeat Elementmentioning

confidence: 99%

“…Impurities tend to aggregate at the triple phase boundary (TPB) and grain size tends to grow. On the cathode side, new phases can be produced at the interface with the electrolyte for LSM cathodes [1][2][3]. LSF cathodes, which are used more recently in the intermediate temperature range, are subject to diffusion of Zr cations from the electrolyte [4], thus reducing their electronic conductivity.…”

Section: Electrode and Electrolyte Degradationmentioning

confidence: 99%

Simulation of SOFC stack and repeat elements including interconnect degradation and anode reoxidation risk

Larrain

herle

Favrat

2006

Journal of Power Sources

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Reliability of SOFC stacks is a complex and key issue. This paper presents a simulation study including some degradation processes, namely interconnect degradation and the anode reoxidation potential. Quantification for these phenomena has been included in a repeat element model to simulate stack degradation and study the influence of design and operating parameters on the degradation.Interconnect degradation is based on Wagner's law for oxide scale growth, parameters applying to metallic interconnects used in planar SOFCs are used. Anode reoxidation is modeled by thermodynamic equilibrium which allows identification of the operating conditions where the anode is likely to be reoxidized.Simulations have been carried out for a large number of cases at different current density, fuel utilization and furnace temperature, for two different stack designs (base case and modified design). Using an appropriate criterion to express degradation, all these cases point to a clear trade-off between interconnect degradation and local temperature. The base case design is likely to be exposed to anode reoxidation.

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“…Thermodynamically, ZrO 2 reacts with LaMnO 3 to form insulating phases such as La 2 Zr 2 O 7 between the cathode and electrolyte, at temperatures above 1100°C [42,43,44,45]. Although the reaction kinetics of this reaction are slow, these insulating phases are undesirable in SOFCs and must be minimized because they hinder electronic conduction in the cathode causing cell performance to degrade significantly.…”

Section: Chemical Interactionsmentioning

confidence: 99%

Development of hot pressing as a low cost processing technique for fuel cell fabrication

Sarin

Pal

Gopalan

2003

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Microstructural and microchemical characterization of the interface between La0.85Sr0.15MnO3 and Y2O3-stabilized ZrO2

Cited by 71 publications

References 5 publications

Thermally and Electrochemically Induced Electrode/Electrolyte Interfaces in Solid Oxide Fuel Cells: An AFM and EIS Study

Thermally and Electrochemically Induced Electrode/Electrolyte Interfaces in Solid Oxide Fuel Cells: An AFM and EIS Study

Simulation of SOFC stack and repeat elements including interconnect degradation and anode reoxidation risk

Development of hot pressing as a low cost processing technique for fuel cell fabrication

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