Electrochemical stability of (La,Sr)CoO3−δ in (La,Sr)CoO3−δ/(Ce, Gd)O2−δ heterostructures

Santos‐Gómez, Lucía dos; Sanna, Simone; Norby, Poul; Pryds, Nini; Losilla, Enrique R.; Marrero-López, D.; Esposito, Vincenzo

doi:10.1039/c8nr08528e

Cited by 13 publications

(16 citation statements)

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“…Conversely, when layers became thicker (for example in the 40 to 80 nm samples, figure 1), the heterostructure tends to adapt to the lattice parameter of YSZ. These two effects also indicate that that the δ-Bi 2 O 3 component is prone to strain more than YSZ in the multilayered arrangement [26]. The XRD patterns clearly also indicate a high coherency of the nanoscaled materials, confirming previous results on pure Bi 2 O 3 and Er-stabilized bismuth sesquioxide [13,16,27].…”

Section: Resultssupporting

confidence: 85%

“…Coherency and reduced thickness of the epitaxial fluorite structures in the multilayer are necessary conditions to obtain the chemical stabilization of highly defective metal oxides [24][25][26]. For bismuth sesquioxide, such conditions are achieved by depositing nanometric multilayer on single crystal substrates that present compatible lattice parameter with materials in the multilayer.…”

Section: Resultsmentioning

confidence: 99%

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Effect of high oxygen deficiency in nano-confined bismuth sesquioxide

et al. 2020

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Bismuth sesquioxide in its cubic form, i.e. δ-Bi 2 O 3 , is the fastest oxygen ionic conductor known which has important applications in energy technologies. However, the material is unstable as it undergoes high-density polymorphic transitions and degradation. In this work, we show that δ-Bi 2 O 3 can be stabilized both at high and low temperatures (T<775°C) under low oxygen partial pressure (pO 2 <10 −5 atm), where the material is nanostructured in multilayered thin film coherent heterostructures with yttrium stabilized zirconia. Density Functional Theory calculation confirms such a form of metastability, also showing that high oxygen defect concentration favors the cubic phase. Moreover, high oxygen deficiency in the nanoionics leads to an unexpected 'two-regime' conductivity with high values (σ>1 S cm −1 at 600°C) at high pO 2 and lower ionic conductivity (σ∼0.1 S cm −1 at 600°C) at low pO 2 . Ionic conductivity at low pO 2 occurs with high activation energy (Ea>1.5 eV), suggesting a drastic decrease in mobility for high concentration of defects.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Effect of high oxygen deficiency in nano-confined bismuth sesquioxide

et al. 2020

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“…[42] The chemical stability of LSC 113 was also improved in other heterostructures. [32] Nonetheless, the thermal energy above 450°C was sufficient to promote Sr 2+ surface enrichment and precipitation of phases in both VAN and LSC 113 thin films. This resulted in a strong degradation of the oxygen exchange kinetics.…”

Section: Epitaxial Superlattices and Vertically Aligned Nanocomposites For Cathodesmentioning

confidence: 95%

“…[29][30][31] Several heterointerfaces feature a large ionic and/or electronic conductivity. [29,32] Heterointerfaces between perovskites and the Ruddlesden-Popper phases have been thoroughly investigated in recent years as cathodes and functional interlayers between electrolyte and cathode. [33,34] [33,[35][36][37][38] Sase et al [35][36][37] reported for the first time the remarkable enhancement of oxygen exchange kinetics of~3-4 orders of magnitude in LSC 113 /LSC 214 heterointerfaces as compared to the separate phases.…”

Section: Epitaxial Superlattices and Vertically Aligned Nanocomposites For Cathodesmentioning

confidence: 99%

Nanostructured Materials and Interfaces for Advanced Ionic Electronic Conducting Oxides

Acosta

Baiutti

Tarancón

et al. 2019

Adv Materials Inter

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Mixed ionic electronic conductors (MIEC) are pivotal materials in a number of electrochemical devices which are relevant for clean energy technologies and industrial chemical processes. In this report progress, we provide an overview of the recent strategies to tune surfaces and interfaces of MIEC fluorite and perovskite oxides for solid oxide fuel cells and micro-solid oxide fuel cells electrodes. Most of the works presented focus on salient strategies to improve the oxygen reduction reaction (ORR) and the fuel oxidation reaction kinetics. We provide insights on the current understanding of heterointerfaces in epitaxial thin films and vertically aligned nanocomposites for ORR kinetics. A selection of oxide materials having potential for thin-film anode application is also presented. We further discuss recent salient results in grain boundary engineering and ex-solution as well as strain engineering and photoactivation for the development of advanced electrodes.

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“…With regard to metastability, however, experimental evidence is rather inconsistent. The beneficial effect of nanoconfinement on (La,Sr)CoO3 (LSC) has been recently reported in LSC-(Ce,Gd)O2 epitaxial heterostructures [294] . For LSC, there is a thermodynamic driving force to segregate CoO from the La2O3 components, especially when it chemically interacts with CO2 and water [267] .…”

Section: Effects Of Nanoconfinement In Composites and Heterostructuresmentioning

confidence: 98%

Metastability at Defective Metal Oxide Interfaces and Nanoconfined Structures

Esposito

Castelli

2020

Adv Materials Inter

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Electrochemical stability of (La,Sr)CoO_3−δ in (La,Sr)CoO_3−δ/(Ce, Gd)O_2−δ heterostructures

Abstract: A modulated coherent (La,Sr)CoO3−δ/(Ce,Gd)O2−δ heterostructure is characterized for the first time for its electronic and chemical properties.

Cited by 13 publications

References 50 publications

Effect of high oxygen deficiency in nano-confined bismuth sesquioxide

Effect of high oxygen deficiency in nano-confined bismuth sesquioxide

Nanostructured Materials and Interfaces for Advanced Ionic Electronic Conducting Oxides

Metastability at Defective Metal Oxide Interfaces and Nanoconfined Structures

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