Interfacial reaction and electrochemical properties of dense (La,Sr) CoO3−δ cathode on YSZ (1 0 0)

Sase, Maya; Ueno, Daisuke; Yashiro, Keiji; Kaimai, Atsushi; Kawada, Tatsuya; Mizusaki, Junichiro

doi:10.1016/j.jpcs.2004.06.057

Cited by 105 publications

(94 citation statements)

References 12 publications

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“…46,68,102 Another is the remaining TPB. Although almost all the data follow the trend expected for dense electrodes 33,48 at high P(O 2 ) of above 0.1 bar at 700-900°C, 33,68 some of the data deviate from the trend of dense electrode and rather follow the tendency of the reaction via TPB.…”

Section: Dense Film Electrodementioning

confidence: 51%

Model for Solid Electrolyte Gas Electrode Reaction Kinetics; Key Concepts, Basic Model Construction, Extension of Models, New Experimental Techniques for Model Confirmation, and Future Prospects

Mizusaki

2014

Electrochemistry

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In order to survey history and state of art of theoretical and kinetic studies of gas electrode reaction on solid oxide electrolyte, overview was made on the research works reported by the author and his co-investigators. Through reviewing their works, frontier of research is clarified. It was shown that electrode reaction is controlled by nonfaradaic chemical reaction process, and the nature of the overpotential is the chemical potential deviation of the interface from equilibrium state. Mechanical stress at the electrode/solid electrolyte interface is considered varying with the overpotential. Importance is emphasized for mechano-electrochemistry, the field to study the relationship of electrochemistry and mechanical property of the electrochemical cells.

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Section: Dense Film Electrodementioning

confidence: 51%

Model for Solid Electrolyte Gas Electrode Reaction Kinetics; Key Concepts, Basic Model Construction, Extension of Models, New Experimental Techniques for Model Confirmation, and Future Prospects

Mizusaki

2014

Electrochemistry

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“…The main concern in the development of composite cathodes is whether there are solid-state reactions between the perovskite and YSZ. This is clearly the deactivation mechanism for electrodes based on LaCoO 3 and YSZ, because model studies have demonstrated formation of insulating phases ͑e.g., La 2 Zr 2 O 7 ͒ at the interface between these two oxides at temperatures as low as 973 K. 14 The elimination of solid-state reactions between LSF and YSZ was clearly the goal of earlier studies that employed ceria interlayers or additives to lower the sintering temperature of LSF. 8,9 The results of this study, however, do not suggest that solid-state reactions are responsible for the observed deactivation.…”

Section: Discussionmentioning

confidence: 99%

“…LSM-YSZ electrodes can be prepared by simply sintering the mixed powders together on YSZ electrolytes, because formation of insulating layers of La 2 Zr 2 O 7 and SrZrO 3 occurs only at very high temperatures. 1,13 By contrast, LSCo undergoes solid-state reactions with YSZ, even at 973 K, 14 making it necessary to introduce an interlayer between LSCo and YSZ to avoid contact.…”

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confidence: 99%

The Stability of LSF-YSZ Electrodes Prepared by Infiltration

Wang

Gross

Vohs

et al. 2007

J. Electrochem. Soc.

164

184

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Composite electrodes were prepared by adding 40 wt % La 0.8 Sr 0.2 FeO 3 ͑LSF͒ into porous yttria-stabilized zirconia ͑YSZ͒ and their performance was studied as a function of time and calcination temperature. X-ray diffraction ͑XRD͒ patterns of the LSF-YSZ composites indicated an expanded lattice parameter after calcination above 1523 K, suggesting that Zr reacted with the LSF to form a Zr-doped perovskite; but XRD provided no evidence for reaction between LSF and YSZ after calcination at 1373 K or after operation for 1000 h at 973 K and 700 h at 1073 K. A composite of 40 wt % La 0.8 Sr 0.2 Fe 0.9 Zr 0.1 O 3 in YSZ showed reasonable performance at 973 K, with an area-specific resistance ͑ASR͒ of 0.22 ⍀ cm 2 . Based on symmetric-cell measurements, electrodes calcined at 1123 K showed an initial ASR of 0.13 ⍀ cm 2 at 973 K but this increased linearly with time to 0.55 ⍀ cm 2 after 2500 h at 973 K. However, the ASR depended strongly on current density, decreasing dramatically under both anodic and cathodic polarization. Electrodes calcined at 1373 K showed an ASR of 2.5 ⍀ cm 2 at 973 K but this value also decreased dramatically under polarization. Scanning electron microcopy images demonstrate that aging at 973 K and calcination at 1373 K cause significant sintering of the LSF. It is therefore suggested that deactivation is caused by morphological changes, rather than solid-state reactions, with a dense layer of LSF forming over the YSZ substrate.

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“…La 2 Zr 2 O 7 and SrZrO 3 , due to cations diffusion during the cell fabrication and operation. 5), 6) These phases formed at the interface of cathode and electrolyte increase the fuel cell ohmic and polarization losses and decrease its overall performance. 7) To prevent formation of low conductive phases, a diffusion barrier interlayer is usually fabricated at the cathode/electrolyte interface.…”

Section: Introductionmentioning

confidence: 99%

Three electrode configuration measurements of electrolyte-diffusion barrier-cathode interface

Szymczewska

Karczewski

Nacute

et al. 2015

J. Ceram. Soc. Japan

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Measurements of a system consisting of cathode/doped ceria diffusion barrier/doped zirconia electrolyte were made using twoand three-electrode configuration. Results obtained on a three-electrode measurement configuration were compared with and reflect the results obtained in two-electrode configuration. Three-electrode measurements allowed separating the impact of the symmetrical interface in the investigated system. They also enabled to obtain additional information about the investigated interface, such as the behavior of the system under an external polarization voltage. It has been shown that the 200 to 1200 nm thick CGO diffusion barrier layer fabricated by spray pyrolysis significantly reduces the polarization resistance of the interface. It also minimizes the impact of the polarization resistance in the presence of external polarization voltage.

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Interfacial reaction and electrochemical properties of dense (La,Sr) CoO3−δ cathode on YSZ (1 0 0)

Cited by 105 publications

References 12 publications

Model for Solid Electrolyte Gas Electrode Reaction Kinetics; Key Concepts, Basic Model Construction, Extension of Models, New Experimental Techniques for Model Confirmation, and Future Prospects

Model for Solid Electrolyte Gas Electrode Reaction Kinetics; Key Concepts, Basic Model Construction, Extension of Models, New Experimental Techniques for Model Confirmation, and Future Prospects

The Stability of LSF-YSZ Electrodes Prepared by Infiltration

Three electrode configuration measurements of electrolyte-diffusion barrier-cathode interface

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