Enhancement of Oxygen Surface Exchange at the Hetero-interface of (La,Sr)CoO[sub 3]/(La,Sr)[sub 2]CoO[sub 4] with PLD-Layered Films

Sase, Maya; Hermes, Florian; Yashiro, Keiji; Sato, Kazuhisa; Mizusaki, Junichiro; Kawada, Tatsuya; Sakai, Natsuko; Yokokawa, Harumi

doi:10.1149/1.2928612

Cited by 113 publications

(127 citation statements)

References 26 publications

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“…This effect was found by Sase as the enhancement of oxygen decomposition reaction on perovskite-type La 1¹x Sr x CoO 3 oxide electrode surface with the dispersion of La 2¹y Sr y CoO 4 phase on it and detailed analysis was reported. 52,53,56 Conceptually similar effect was already employed by many researchers such as GDC anode dispersed with Ni.…”

Section: Response Of Potentiometric Sensor and Chemical Capacitancementioning

confidence: 73%

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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: Response Of Potentiometric Sensor and Chemical Capacitancementioning

confidence: 73%

“…42,51 The enhancement of surface reaction of La 1¹x Sr x CoO 3¹D by the dispersion of La 2¹x Sr x CoO 4 was confirmed by SIMS. 52,53 Using tracers and SIMS analysis after quenching, we can visualize the reaction path three dimensionally.…”

Section: Semi In-situ Measurements; Application Of Simsmentioning

confidence: 99%

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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“…[13][14][15][16][17][18] Using well-defined epitaxial thin film systems, remarkably enhanced oxygen surface exchange kinetics (up to ∼2 orders of magnitude) of LSC 113 has been reported by decorating (La 0.5 Sr 0.5 ) 2 CoO 4±δ (LSC 214 ) phase on the LSC 113 surface. [13,19] Coherent Bragg rod analysis (COBRA) and density functional theory (DFT) have suggested that the enhanced oxygen surface exchange kinetics may be attributed to the Sr segregation at the LSC 214 -LSC 113 interface and the LSC 214 surface, resulting from a large driving force for A-site cation interdiffusion across the heterostructured interface.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of oxygen surface exchange on epitaxial La0.6Sr0.4Co0.2Fe0.8O3-δ thin films using advanced heterostructured oxide interface engineering

Lee

Wang

et al. 2016

MRS Communications

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Engineering of a novel heterostructured oxide interface was used to enhance the oxygen surface exchange kinetics of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF 113 ) thin films. A single-layer decoration of mixed (LaSr) 2 CoO 4±δ (LSC 214 ) and La 1−x Sr x CoO 3−δ (LSC 113 ) and a double-layer decoration of stacked LSC 214 and LSC 113 grown on the LSCF 113 markedly enhanced the surface exchange coefficients of the LSCF 113 by up to ∼1.5 orders of magnitude relative to the undecorated LSCF 113 . It is hypothesized that two different types of surface decorations can enable Sr segregation at the interface and surfaces of LSC 113 and LSC 214 , leading to enhancement of the oxygen surface exchange kinetics of decorated LSCF 113 .The development of highly active cathode materials is essential to lower the operating temperature of solid oxide fuel cells (SOFCs), where the slow kinetics of the oxygen surface exchange on the cathode surface limits the efficiency of SOFCs at intermediate temperatures (500-750°C). [1,2] Current cathode materials such as La 1−x Sr x MnO 3−δ (LSM 113 ) [3][4][5] with high electronic conductivity but low ionic conductivity [6] are inadequate for the usage in the intermediate temperature range due to insufficient surface activity.La 1−x Sr x Fe 1−y Co y O 3−δ (LSCF 113 ), which has beneficial materials properties such as high ionic and electronic conductivity, [7] and fast oxygen surface exchange, [8] therefore, has been developed as one of the most promising commercial cathode materials for intermediate temperature SOFCs. In particular, a solution infiltration process, in which a phase transition occurs from a liquid into a solid has been widely used to further enhance the surface activity of LSCF 113 . [9][10][11][12] Utilizing infiltrated LSM 113 coatings, it has been shown the enhanced electrocatalytic activity of LSCF 113 cathodes. [11,12] Infiltrated La 0.4875 Ca 0.0125 Ce 0.5 O 2−δ (LCC) [9] and Sm 0.5 Sr 0.5 CoO 3−δ (SSC) [10] coatings have also been used for better stability and activity of LSCF 113 electrodes. Although many studies have shown the enhanced cathodic performance of LSCF 113 by surface modification through a solution-based infiltration process, the origin responsible for the enhanced stability and activity of decorated LSCF 113 cathode is poorly understood.Ruddlesden-Popper (RP) phases (A 2 BO 4 ) have been utilized as a material for the La 1−x Sr x CoO 3−δ (LSC 113 ) surface modification, which results in the enhanced surface activity of LSC 113 significantly due to the formation of heterostructured oxide interfaces. [13][14][15][16][17][18] Using well-defined epitaxial thin film systems, remarkably enhanced oxygen surface exchange kinetics (up to ∼2 orders of magnitude) of LSC 113 has been reported by decorating (La 0.5 Sr 0.5 ) 2 CoO 4±δ (LSC 214 ) phase on the LSC 113 surface. [13,19] Coherent Bragg rod analysis (COBRA) and density functional theory (DFT) have suggested that the enhanced oxygen surface exchange kinetics may be attributed to the Sr segregation ...

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“…6 Some interfaces in oxides are known to enhance ionic diffusion. [7][8][9] Modifications of interfacial charge to manipulate properties of the space charge layer provide another venue of changing transport properties in the proximity of an interface. If the density of the interfaces is such that space charge layers overlap, one can expect emergent behavior of ionic transport properties that cannot be interpolated from the bulk counterpart behavior.…”

mentioning

confidence: 99%

First-principles study of compensation mechanisms in negatively charged LaGaO3/MgAl2O4interfaces

et al. 2013

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Enhancement of Oxygen Surface Exchange at the Hetero-interface of (La,Sr)CoO[sub 3]/(La,Sr)[sub 2]CoO[sub 4] with PLD-Layered Films

Cited by 113 publications

References 26 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

Enhancement of oxygen surface exchange on epitaxial La0.6Sr0.4Co0.2Fe0.8O3-δ thin films using advanced heterostructured oxide interface engineering

First-principles study of compensation mechanisms in negatively charged LaGaO3/MgAl2O4interfaces

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