Crystal structure, electrical and magnetic properties of La1 − xSrxCoO3 − y

Петров, А. Н.; Kononchuk, O. F.; Andreev, A.V.; Черепанов, В.А.; Kofstad, Per

doi:10.1016/0167-2738(95)00114-l

Cited by 318 publications

(202 citation statements)

References 12 publications

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“…The defect complexes formed above T h.c. in this study involve association between La 3+ cations (positive effective charge) and cobalt cations (effective negative charge), forming into a neutral complex defect ( Figure S1 Equation 3). [29][30][31] With increasing concentration, these types of defects may order and form intergrown microdomains of a closely related perovskite phase, rhombohedral LaCoO 3 perovskite phase, which is analyzed in detail by X-ray diffraction, TEM EDS, TEM images, 29,32,33 and analysis of the extended X-ray absorption fine structure (EXAFS). Within the range between T h.c. (~1050 °C) and T l.c , a cubic perovskite phase exists uniformly as inferred from XRD ( Figure S1).…”

Section: Resultsmentioning

confidence: 99%

Optimizing nanoparticle perovskite for bifunctional oxygen electrocatalysis

Jung

Risch

Park

et al. 2016

Energy Environ. Sci.

302

210

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The world-wide interest in reducing the dependency on fossil fuels demands the development of energy storage systems with high power density from abundant materials, which would enable wide-spread industrial deployment of grid-scale renewable energy systems, as well as the progressive advancement of high-powered electric vehicles (EVs). Perovskite oxide ceramics attracted significant attention as a strong candidate for bi-functional electrocatalyst for metal-air batteries. There has been consistent investigation on the viability of bi-functional electrocatalysts, because energy storage systems cannot operate rechargeably without the proper bi-functional electrocatalyst. Among various electrocatalysts for both oxygen evolution and reduction, making nanoparticles from these materials for practical applications is a great challenge. The newly introduced pervovskite electrocatalyst of ~50 nm size preferentially reduced oxygen to water (< 5 % peroxide yield), exhibited more than 20 times higher gravimetric activity (A/g) than IrO2 in an OER half-cell test, and surpassed the charge/discharge performance of Pt/C (20 wt%) in a zinc-air full cell test. This study describes substantially the systematic engineering of perovskite ceramics into such a bifunctional nanosized electrocatalyst with high stability and activity, which was also explained in detail from the aspect of defect chemistry. Highly efficient bifunctional oxygen electrocatalysts are indispensable to the development of highly efficient regenerative fuel cells and rechargeable metal-air batteries, which could power future electric vehicles. Although perovskite oxides are known to have high intrinsic activity, large particle sizes rendered from traditional synthesis routes limit their practical use due to low mass activity. We report the synthesis of nano-sized perovskite particles with a nominal composition of L ax(Ba0.5Sr0.5)1-xCo0.8Fe0.2O3-d (BSCF), where lanthanum concentration and calcination temperature were controlled to influence oxide defect chemistry and particle growth. This approach produced a bifunctional perovskite electrocatalyst of ~50 nm size with supreme activity and stability for both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The electrocatalyst preferentially reduced oxygen to water (<5 % peroxide yield), exhibited more than 20 times higher gravimetric activity (A/g) than IrO2 in an OER half-cell test (0.1 M KOH), and surpassed the charge/discharge performance of Pt/C (20 wt%) in a zinc-air full cell test (6 M KOH).Our work provides a general strategy for designing perovskite oxides as inexpensive, stable and highly active bifunctional electrocatalysts for future electrochemical energy storage and conversion devices.The world-wide interest in reducing the dependency on fossil fuels demands the development of energy storage systems with high power density from abundant materials, which would enable widespread industrial deployment of grid-scale renewable energy systems, as well as the progressive advancement of...

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Section: Resultsmentioning

confidence: 99%

Optimizing nanoparticle perovskite for bifunctional oxygen electrocatalysis

Jung

Risch

Park

et al. 2016

Energy Environ. Sci.

302

210

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“…Кобальтит лантана LaCoO 3 и перовскитоподобные твердые растворы (La 1−x A x )CoO 3−δ (где A = K, Ca, Sr, Ва; 0 ≤ x < 0.5, δ ≥ 0) привлекают внимание ис-следователей своими необычными физико-химическими свойствами [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. В настоящее время довольно пол-но изучены области существования, кристаллическая структура, электрические, магнитные и каталитические свойства образцов твердых растворов, в которых ио-ны La замещаются ионами щелочно-земельных метал-лов [1][2][3][4][5][6][7][8].…”

Section: Introductionunclassified

“…В настоящее время довольно пол-но изучены области существования, кристаллическая структура, электрические, магнитные и каталитические свойства образцов твердых растворов, в которых ио-ны La замещаются ионами щелочно-земельных метал-лов [1][2][3][4][5][6][7][8]. Установлено, что исходный оксид этих твер-дых растворов LaCoO 3 кристаллизуется в ромбоэдриче-ски (гексагонально) искаженной структуре перовскита.…”

Section: Introductionunclassified

“…Дальнейшее увеличение концентрации щелочно-земельных металлов вызывает изменение симметрии кристаллической решетки от ром-боэдрической к орторомбической. Этот процесс оказыва-ет существенное влияние на электромагнитные свойства образцов [2,3,[6][7][8][9][10]. При некоторой концентрации ато-мов A (x > 0.4) происходит переход полупроводник−ме-талл, и проводимость становится металлической во всем изученном температурном интервале.…”

Section: Introductionunclassified

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Электропроводность и термоэдс оксидов La-=SUB=-1-x-=/SUB=-Li-=SUB=-x-=/SUB=-CоO-=SUB=-3-delta-=/SUB=- (0 ≤ x≤ 0.1)

Vecherskii¹,

Konopel’ko²,

Баталов³

et al. 2016

Физика Твердого Тела

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Исследовано влияние концентрации ионов Li на фазовый состав, электропроводность и термоэдс синтезированных керамическим способом оксидов La1-xLixCоO3-delta (0 ≤ x ≤ 0.1). Найдено, что область существования перовскитоподобного твердого раствора La1-xLixCоO3-delta не превышает x=0.05. Легирование литием приводит к увеличению электропроводности однофазных образцов по сравнению с имеющей место для LaCoO3. При повышении температуры от 300 до 400 K термоэдс LaCoO3 увеличивается от отрицательных до положительных значений, а затем уменьшается, оставаясь положительной в температурном интервале 400-1020 K. Термоэдс остальных образцов имеет положительный знак. Полученные результаты обсуждаются на основе моделей плотности электронных состояний в LaCoO3 и La1-xSrxCоO3-delta, предложенных в работах Сенарис-Родригеза (Senaris-Rodriguez) и Гуденафа (Goodenough), а также теории некристаллических веществ, развитой Моттом (Mott). Работа (частично) выполнена с использованием оборудования центра коллективного пользования "Состав вещества" ИВТЭ УрО РАН.

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“…able to operate with hydrocarbon fuels in addition to hydrogen and show a high tolerance to typical catalyst poisons, all associated with their elevated operating temperatures, typically above 600-700 • C. Cathodes of SOFCs are generally based on perovskite-type oxides such as La 1-x Sr x MnO 3-δ , 1-4 La 1-x Sr x FeO 3-δ 5-7 and La 1-x Sr x CoO 3-δ . [8][9][10][11] The electrocatalytic properties of these electrode materials depend not only on their cation composition and their detailed surface chemistry, but can also be strongly impacted by the chemical potential of oxygen and, in turn, by applied overpotentials. Depending on the ionic conductivity of these electrode materials, oxygen reduction may take place via the so-called bulk path (two phase boundary), with oxygen reduction at the oxide surface followed by oxygen ion transport through the electrode to the electrolyte.…”

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confidence: 99%

Experimental Design for Voltage Driven Tracer Incorporation and Diffusion Studies on Oxide Thin Film Electrodes

Huber

Navickas

Sasaki

et al. 2017

J. Electrochem. Soc.

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The effect of an applied overpotential on oxygen isotope incorporation and diffusion in oxide thin film electrodes is investigated by a novel experimental approach. A special electrode geometry leads to in-plane electron flow, perpendicular oxide ion flow and a well-defined laterally varying driving force. This design allows one to obtain a series of tracer depth profiles induced by a range of overpotentials on one and the same thin film. The approach was applied to La 0.8 Sr 0.2 MnO 3 (LSM) thin films deposited by pulsed laser deposition (PLD) on yttria stabilized zirconia (YSZ) single crystals. Tracer depth profiles were measured by secondary ion mass spectrometry (SIMS). These depth profiles include examples of pronounced apparent uphill diffusion that can be explained by considering an interplay of polarization-induced changes in stoichiometry within the LSM grains combined with fast oxygen transport along the grain boundaries.

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Crystal structure, electrical and magnetic properties of La1 − xSrxCoO3 − y

Cited by 318 publications

References 12 publications

Optimizing nanoparticle perovskite for bifunctional oxygen electrocatalysis

Optimizing nanoparticle perovskite for bifunctional oxygen electrocatalysis

Электропроводность и термоэдс оксидов La-=SUB=-1-x-=/SUB=-Li-=SUB=-x-=/SUB=-CоO-=SUB=-3-delta-=/SUB=- (0 ≤ x≤ 0.1)

Experimental Design for Voltage Driven Tracer Incorporation and Diffusion Studies on Oxide Thin Film Electrodes

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Crystal structure, electrical and magnetic properties of La1 − xSrxCoO3 − y

Cited by 318 publications

References 12 publications

Optimizing nanoparticle perovskite for bifunctional oxygen electrocatalysis

Optimizing nanoparticle perovskite for bifunctional oxygen electrocatalysis

Электропроводность и термоэдс оксидов La-=SUB=-1-x-=/SUB=-Li-=SUB=-x-=/SUB=-CоO-=SUB=-3-delta-=/SUB=- (0 &le; x&le; 0.1)

Experimental Design for Voltage Driven Tracer Incorporation and Diffusion Studies on Oxide Thin Film Electrodes

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Электропроводность и термоэдс оксидов La-=SUB=-1-x-=/SUB=-Li-=SUB=-x-=/SUB=-CоO-=SUB=-3-delta-=/SUB=- (0 ≤ x≤ 0.1)