Synthesis, characterization and evaluation of cation-ordered LnBaCo2O5+ as materials of oxygen permeation membranes and cathodes of SOFCs

Zhang, Kun; Ge, Lei; Ran, Ran; Shao, Zongping; Liu, Shaomin

doi:10.1016/j.actamat.2008.06.004

Cited by 485 publications

(282 citation statements)

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“…At the same time, the presence of cobalt cations that can easily change their oxidation state is favorable for electron conductivity [7][8][9]. Therefore, the double perovskite cobaltites have attracted considerable interest in recent years from the researchers in the field of catalysis, adsorption and cathode materials [10][11][12][13][14][15][16][17][18][19]. It is known that the respective functional properties are tightly related with the nature of electron and ion defects in non-stoichiometric oxides, in general, and in the doubleperovskite cobaltites, in particular.…”

Section: Introductionmentioning

confidence: 99%

Defect equilibrium in PrBaCo2O5 at elevated temperatures

Suntsov

Леонидов

Патракеев

et al. 2013

Journal of Solid State Chemistry

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a b s t r a c t A defect equilibrium model for PrBaCo 2 O 5+δ is suggested based on oxygen non-stoichiometry data. The model includes reactions of oxygen exchange and charge disproportionation of Co 3+ cations. The respective equilibrium constants, enthalpies and entropies for the reactions entering the model are obtained from the fitting of the experimental data for oxygen non-stoichiometry. The enthalpies of oxidation Co 2+ -Co 3+ and Co 3+ -Co 4+ are found to be equal to 115 7 9 kJ mol -1 and 45 74 kJ mol -1 , respectively. The obtained equilibrium constants were used in order to calculate variations in concentration of cobalt species with non-stoichiometry, temperature and oxygen pressure.

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Section: Introductionmentioning

confidence: 99%

Defect equilibrium in PrBaCo2O5 at elevated temperatures

Suntsov

Леонидов

Патракеев

et al. 2013

Journal of Solid State Chemistry

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“…|PrO δ |CoO 2 |BaO|CoO 2 as shown in Figure 1. 13,14 The potential of perovskite oxides for oxygen electrocatalysis was first demonstrated in the late 1970's by Matsumoto and co-workers. 15 They initially proposed that the formation of a σ * band in the lattice as well as the oxidation state of the transition metal cation (B-site), believed to be the active site, were the main factors determining high OER activity.…”

mentioning

confidence: 99%

Electrocatalysis of Perovskites: The Influence of Carbon on the Oxygen Evolution Activity

Mohamed

Cheng

Fabbri

et al. 2015

J. Electrochem. Soc.

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Single and double perovskite oxides have been reported to be amongst the most active electrocatalysts for the oxygen evolution reaction (OER) in alkaline electrolyte. Although a detailed study of the bulk electronic structure-activity relationship towards oxygen evolution on these oxides has been reported, the influence of carbon on the behavior of these oxides as OER catalysts is not yet clearly understood. In the present work we study the influence of functionalized acetylene black (AB f ) carbon in the electrode composition on the OER activity for perovskite oxides using the thin-film rotating disk electrode technique. It was found that the addition of AB f significantly enhances the OER activity of the single perovskite oxides, namely Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ , (BSCF) and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF). The activity of the double perovskite oxide, (Pr 0.5 Ba 0.5 )CoO 3-δ (PBCO), was relatively unaffected by the addition of AB f in the electrode. Ex situ impedance spectroscopy measurements at room temperature showed that BSCF powder displayed a lower resistivity compared to PBCO with LSCF displaying the highest resistivity of the three materials. These results therefore suggest that the AB f present can more than simply improve the conductive pathway in the perovskite/carbon composite electrodes but can also significantly enhance the electrocatalytic activity of selected perovskites towards the OER. The oxygen evolution reaction (OER), the process of generating molecular oxygen through the electrochemical oxidation of water, is a key reaction in energy storage processes involving hydrogen and central to addressing the impending global energy crisis. This reaction, occurring at the anode of the water splitting reaction, is primarily governed by slow kinetics 1 and has therefore been extensively studied to improve the performance of devices such as water electrolyzers. 2,3,4 Significant overpotential losses remain a hurdle which requires the need for rare and expensive noble-metal based electrocatalysts for efficient operation. The development and application of new materials able to compete with expensive state-of-the-art current electrocatalysts for hydrogen generating devices therefore yields a great challenge.Various electrocatalytic materials have been studied in the past towards improving the OER, where the oxides of Ir and Ru have been conventionally identified as the most active, often in mixtures with other transition metal oxides. 5,6,7 From the numerous metal oxides studied, perovskite oxides emerged as promising electrocatalysts for both the OER and ORR (oxygen reduction reaction) in alkaline media where a number of these oxides have been reported to be sufficiently stable for practical applications. 8,9 The perovskite-type oxide family, has the general formula ABO 3 , where the A-site is occupied by an alkaline earth element, such as Ca, Ba and Sr and rare earth elements (lanthanides) such as La or Pr. The B-site is occupied by a transition metal element in 6-fold coordination to...

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“…When considering systems Ln-BaCo-O much attention is paid to bilayer ordered perovskites LnBaCo 2 O 5+d [114][115][116][117][118][119][120][121]. Unlike iron-and manganese-containing systems, the compounds with similar structure are thermodynamically stable at atmospheric pressure.…”

Section: № 4 | 2015 Chimica Techno Actamentioning

confidence: 99%

Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

et al. 2015

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Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of.Review is dedicated studies of phase equilibria in the systems based on rare earth elements and 3d transition metals. It's highlighted several structural families of these compounds and is shown that many were found interesting properties for practical application, such as high conductivity up to the superconducting state, magnetic properties, catalytic activity of the processes of afterburning of exhaust gases, the high mobility in the oxygen sublattice and more.Keywords: phase equilibrium; manganites; isobaric-isothermal diagrams; solid solutions © Cherepanov V. A., Gavrilova L. Ya., Volkova N. E., Urusova A. S., Aksenova T. V., Kiselev E., 2015 IntroductionThe studies of phase equilibria in the systems based on rare earth elements and 3d transition metals and thermodynamic parameters of the oxide phases formed in these systems was initiated by Vladimir Mikhailovich Zhukovsky in 1977 under the direct supervision of Alexander Nikolaevich Petrov, as the development of contractual issues, conducted with an experienced company GIREDMET. The works on the study of the system Sm-Co-O and properties of oxide phases formed in system were then extended to other rare earth elements (REE) [1][2][3][4][5][6][7][8] and 3d transition metals [9][10][11][12][13]. A characteristic feature of these systems is the formation of oxide phases with perovskite structure AVO 3 and related. The partial substitution of rare earth elements in alkaline earth metals (AEM) leads to significant change of properties and they found a wide range of interesting for practical applications of the properties such as high conductivity up to the superconducting state, magnetic properties, catalytic activity of the processes of afterburning of exhaust gases and a variety of redox reactions, high mobility in the oxygen sublattice and more. In addition, partial substitution in the A-sublattice under constant 3d-cation in the systems Ln-T-O allows to stabilize the structure, which Cherepanov V. A., Gavrilova L. Ya., Volkova N. E., Urusova A. S., Aksenova T. V., Kiselev E. in the given conditions (temperature and oxygen pressure) are thermodynamically unstable. Therefore, further development of investigations of phase equilibria and thermodynamic stability of complex oxides were targeting the systems Ln-M-T-O (where Ln = REE, M = Ca, Sr, Ba; T = Mn, Fe, Co, Ni, Cu). When a certain percentage of similarity (in all possible formation of a phase with perovskite structure LnTO 3±d ) these systems still have a noticeable and distinctive features depending on the nature of the components. Phase equilibrium in systems with T = MnThe significant difference of perovskite phases in the manganese-containing systems Ln-Mn-O is that the oxygen content in them exceeds the stoichiometric air LnMnO 3+d . In fact, the oxygen sublattice is complete and the non-stoichiometry is realized by vacancy disordering ...

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Synthesis, characterization and evaluation of cation-ordered LnBaCo2O5+ as materials of oxygen permeation membranes and cathodes of SOFCs

Cited by 485 publications

References 42 publications

Defect equilibrium in PrBaCo2O5 at elevated temperatures

Defect equilibrium in PrBaCo2O5 at elevated temperatures

Electrocatalysis of Perovskites: The Influence of Carbon on the Oxygen Evolution Activity

Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

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