<i>In situ</i>characterization of the formation of a mixed conducting phase on the surface of yttria-stabilized zirconia near Pt electrodes

Siegel, David A.; Gabaly, Farid El; McCarty, Kevin F.; Bartelt, N. C.

doi:10.1103/physrevb.92.125421

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…X-ray photoelectron spectroscopy (XPS) showed a substantial decrease in the intensity of the Zr 4+ ions and formation of lower oxidation states. The transformation from an electronic insulator to an almost metallic YSZ phase moving as a front has recently been confirmed with energy-resolved PEEM studies by Siegel et al [16]. They found that when stepping from the native YSZ into the reduced YSZ phase there was a sudden jump in the edge of the density of states from higher to lower binding energies, and a Fermi level aligning that of the Pt electrode.…”

Section: Introductionmentioning

confidence: 67%

“…where n' may represent Zr +4 ions reduced to Zr +3 or even Zr +1 [15,9] or electrons in a metallic band structure close to the Fermi level of the polarized electrode [15,16]. Direct electronic conduction from cathode to anode has been reported for planar SOEC cells at 810 °C [32] where a limiting cell voltage close to 1.9 V was observed and it was possible to operate the cell at a stable potential at 0.34 A cm -1 for 64 h without any supply of water.…”

Section: Discussionmentioning

confidence: 99%

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Probe electrode study of cathodically polarized PtIr-YSZ interfaces

Kreka¹,

Jacobsen

2019

J Solid State Electrochem

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Section: Introductionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 99%

Probe electrode study of cathodically polarized PtIr-YSZ interfaces

Kreka¹,

Jacobsen

2019

J Solid State Electrochem

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“…For example, time-dependent changes in the polarization resistance at Pt electrode/YSZ electrolyte/environment triple junctions have been reported in numerous studies and have often been linked with formation of nonstoichiometric PtO x at the interface when a potential is applied 30 31 32 33 . This field-driven PtO x formation may impede the oxygen exchange reactions that occur at the triple junctions 34 , altering the contact resistances. While the electrochemistry of Ag/YSZ junctions in oxidizing environments has not been as extensively studied as Pt/YSZ, a similar impediment to oxygen exchange would be expected to occur if Ag electrodes in contact with the YSZ are oxidized at the triple junctions when a field is applied.…”

Section: Resultsmentioning

confidence: 99%

Interfacial control of oxygen vacancy doping and electrical conduction in thin film oxide heterostructures

et al. 2016

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Oxygen vacancies in proximity to surfaces and heterointerfaces in oxide thin film heterostructures have major effects on properties, resulting, for example, in emergent conduction behaviour, large changes in metal-insulator transition temperatures or enhanced catalytic activity. Here we report the discovery of a means of reversibly controlling the oxygen vacancy concentration and distribution in oxide heterostructures consisting of electronically conducting In2O3 films grown on ionically conducting Y2O3-stabilized ZrO2 substrates. Oxygen ion redistribution across the heterointerface is induced using an applied electric field oriented in the plane of the interface, resulting in controlled oxygen vacancy (and hence electron) doping of the film and possible orders-of-magnitude enhancement of the film's electrical conduction. The reversible modified behaviour is dependent on interface properties and is attained without cation doping or changes in the gas environment.

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“…Several methodologies have been used for nanoscale imaging of mixed metallic and insulating phases in correlated oxides, including scanning tunnelling microscopy [31], near-field infrared microscopy [32] and scanning electron microscopy [33]. Nanoscale phase separation across a phase transition has also been studied using pho-toemission electron microscopy (PEEM) [34,35].…”

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confidence: 99%

Striped nanoscale phase separation at the metal–insulator transition of heteroepitaxial nickelates

et al. 2016

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Nucleation processes of mixed-phase states are an intrinsic characteristic of first-order phase transitions, typically related to local symmetry breaking. Direct observation of emerging mixed-phase regions in materials showing a first-order metal–insulator transition (MIT) offers unique opportunities to uncover their driving mechanism. Using photoemission electron microscopy, we image the nanoscale formation and growth of insulating domains across the temperature-driven MIT in NdNiO3 epitaxial thin films. Heteroepitaxy is found to strongly determine the nanoscale nature of the phase transition, inducing preferential formation of striped domains along the terraces of atomically flat stepped surfaces. We show that the distribution of transition temperatures is a local property, set by surface morphology and stable across multiple temperature cycles. Our data provide new insights into the MIT of heteroepitaxial nickelates and point to a rich, nanoscale phenomenology in this strongly correlated material.

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In situcharacterization of the formation of a mixed conducting phase on the surface of yttria-stabilized zirconia near Pt electrodes

Cited by 6 publications

References 27 publications

Probe electrode study of cathodically polarized PtIr-YSZ interfaces

Probe electrode study of cathodically polarized PtIr-YSZ interfaces

Interfacial control of oxygen vacancy doping and electrical conduction in thin film oxide heterostructures

Striped nanoscale phase separation at the metal–insulator transition of heteroepitaxial nickelates

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