Improvement of oxygen storage properties of hexagonal YMnO3+δ by microstructural modifications

Klimkowicz, Alicja; Świerczek, Konrad; Kobayashi, Shuntaro; Takasaki, Akito; Allahyani, Wadiah; Dąbrowski, B.

doi:10.1016/j.jssc.2017.10.037

Cited by 17 publications

(24 citation statements)

References 25 publications

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“…800°C in Ar corresponds to the oxygen-stoichiometric composition. The Hex0 phase (d & 0) of hexagonal oxides is stable at high temperatures, as it was already documented in all other papers devoted to studies of this class of materials [23,[31][32][33]. Because the substituted cerium tends to have ?4 oxidation state in air, the considered compounds show rather a mixture of the oxidized Hex1 and Hex0 phases, unless properly reduced, e.g., in Ar (Table 1).…”

Section: Oxygen Storage Propertiesmentioning

confidence: 57%

“…-for-Y 3? substituted Y 0.7 Tb 0.3 MnO 3 [32], it can be noticed that the reduced Tb-containing material (Hex0 phase) exhibits larger values of the cell parameter a, while smaller values of the c parameter, and overall the unit cell volume is considerably larger than for the parent YMnO 3 ( Table 1). The difference is significant and matches with bigger Tb 3? in relation to smaller Y 3?…”

Section: Samples Characterization and Structural Studiesmentioning

confidence: 95%

“…Initially, the sintered samples were taken out from a warm furnace and exposed to the atmospheric air, which caused partial oxidation (see the discussion below). The route utilized in this study enables synthesis at relatively low temperatures in comparison with the standard solid-state reaction method [32,38]. More details regarding the preparation procedure can be found elsewhere [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Oxygen separation from air by the combined temperature swing and pressure swing processes using oxygen storage materials Y1−x(Tb/Ce)xMnO3+δ

et al. 2020

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Hexagonal Y1−xRxMnO3+δ (R: other than Y rare earth elements) oxides have been recently introduced as promising oxygen storage materials that can be utilized in the temperature swing processes for the oxygen separation and air enrichment. In the present work, the average and local structures of Tb- and Ce-substituted Y0.7Tb0.15Ce0.15MnO3+δ and Y0.6Tb0.2Ce0.2MnO3+δ materials were studied, and their oxygen storage-related properties have been evaluated. The fully oxidized samples show the presence of a significant amount of the highly oxygen-loaded the so-called Hex3 phase, attaining an average oxygen content of δ ≈ 0.41 for both compositions. Extensive studies of the temperature swing process conducted in air and N2 over the temperature range of 180–360 °C revealed large and reversible oxygen content changes taking place with only a small temperature differences and the high dependence on the oxygen partial pressure. Significant for practical performance, the highest reported for this class of compounds, oxygen storage capacity of 1900 μmol O g−1 in air was obtained for the optimized materials and swing process. In the combined temperature–oxygen partial pressure swing process, the oxygen storage capacity of 1200 μmol O g−1 was achieved.

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Section: Oxygen Storage Propertiesmentioning

confidence: 57%

Section: Samples Characterization and Structural Studiesmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Oxygen separation from air by the combined temperature swing and pressure swing processes using oxygen storage materials Y1−x(Tb/Ce)xMnO3+δ

et al. 2020

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“…Therefore, it is necessary to investigate inexpensive, high efficiency, and excellent oxygen storage properties for these applications. Recently, a large number of OSMs have been actively investigated. − …”

Section: Introductionmentioning

confidence: 99%

Improvement of the Oxygen Storage/Release Speed of YBaCo₄O_7+δ Synthesized by a Glycine-Complex Decomposition Method

Chen

Hasegawa

Kakihana

et al. 2021

ACS Appl. Mater. Interfaces

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The present study explores the oxygen storage capacity of YBaCo 4 O 7+δ prepared by a glycine-complex decomposition method. We reported for the first time that the YBaCo 4 O 7+δ sample was successfully synthesized at such a low temperature of 800 °C by this method. The YBCO-800 N sample exhibited a faster oxygen absorption/desorption speed than that of high calcination temperature samples, and the time required for complete oxygen storage/release was 5 and 6 min at 360 °C, respectively. Moreover, the superior performance observed for this product in the temperature swing adsorption process makes it a promising candidate in oxygen production technologies. This research demonstrated that the glycine-complex decomposition method is an effective method for improving the oxygen storage property of YBaCo 4 O 7+δ and provides a new insight into designing other novel oxygen storage materials.

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“…[21][22][23] Recently, YMnO3+δ has been reported to have large and reversible oxygen content at a low temperature range under oxidative atmosphere because of the easy phase transition between hexagonal P63cm phase and more oxidized structures (e.g., Pca21, R3c). [24] Brownmillerite-type perovskite oxides with a general formula of A2B2O5 can be viewed as the anion-deficient perovskite with alternately stacked tetrahedral BO4 and octahedral BO6 layers. [22,25,26] They can uptake oxygen to form perovskite oxides ABO3±δ, thus having the potential applications as OSMs.…”

Section: Introductionmentioning

confidence: 99%

Oxygen storage capacity and thermal stability of brownmillerite-type Ca2(Al1-xGax)MnO5+δ oxides

Huang

Irvine

2019

Journal of Alloys and Compounds

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Understanding the oxygen uptake/release mechanism in oxygen storage materials is of great importance in the design of energy-related materials and their corresponding applications. In this work, the effects of Ga doping amount on the oxygen storage capacity and thermal stability of Ca2(Al1-xGax)MnO5+δ (0 ≤ x ≤ 1) with a brownmillerite-type structure were investigated. Ca2AlMnO5+δ can reversibly store/release a large amount of excess oxygen (~3.0 wt%) at low temperature (between 300 and 600 o C) under oxidative atmospheres. With the increasing Ga doping amount in Ca2(Al1-xGax)MnO5+δ, these materials uptake less oxygen at higher temperature which can be attributed to the difficulty in the oxidation of tetrahedral GaO4 blocks into octahedral GaO6 blocks under 1 atm O2. However, with the increasing of Ga-substitution amount, these Ca2(Al1-xGax)MnO5+δ (0 ≤ x < 1) can start to uptake oxygen at lower temperatures during the cooling process under flowing O2 due to the distorted structure. The results demonstrated that Ca2(Al1-xGax)MnO5+δ (0 ≤x < 1) can reversibly store/release large amounts of oxygen via just controlling the surrounding temperature and/or oxygen partial pressure but without using reductive gases, which would enable them great potentials in many applications.

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Improvement of oxygen storage properties of hexagonal YMnO3+δ by microstructural modifications

Cited by 17 publications

References 25 publications

Oxygen separation from air by the combined temperature swing and pressure swing processes using oxygen storage materials Y1−x(Tb/Ce)xMnO3+δ

Oxygen separation from air by the combined temperature swing and pressure swing processes using oxygen storage materials Y1−x(Tb/Ce)xMnO3+δ

Improvement of the Oxygen Storage/Release Speed of YBaCo₄O_7+δ Synthesized by a Glycine-Complex Decomposition Method

Oxygen storage capacity and thermal stability of brownmillerite-type Ca2(Al1-xGax)MnO5+δ oxides

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Improvement of oxygen storage properties of hexagonal YMnO3+δ by microstructural modifications

Cited by 17 publications

References 25 publications

Oxygen separation from air by the combined temperature swing and pressure swing processes using oxygen storage materials Y1−x(Tb/Ce)xMnO3+δ

Oxygen separation from air by the combined temperature swing and pressure swing processes using oxygen storage materials Y1−x(Tb/Ce)xMnO3+δ

Improvement of the Oxygen Storage/Release Speed of YBaCo4O7+δ Synthesized by a Glycine-Complex Decomposition Method

Oxygen storage capacity and thermal stability of brownmillerite-type Ca2(Al1-xGax)MnO5+δ oxides

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Product

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About

Improvement of the Oxygen Storage/Release Speed of YBaCo₄O_7+δ Synthesized by a Glycine-Complex Decomposition Method