Rapid oxygen ion diffusion and surface exchange kinetics in PrBaCo2O5+x with a perovskite related structure and ordered A cations

Kim, Guntae; Wang, S.; Jacobson, Allan J.; Reimus, L.; Brodersen, Peter M.; Mims, Charles A.

doi:10.1039/b618345j

Cited by 552 publications

(357 citation statements)

References 28 publications

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“…1,3,5 Recently, using electrical conductivity relaxation ͑ECR͒ and thermogravimetric analysis on bulk ceramic materials, we have found that PrBaCo 2 O 5+␦ ͑PBCO͒ has unusually rapid oxygen transport kinetics at low temperatures ͑300-500°C͒, suggesting its application as a cathode in SOFCs. 6 Similar results have been reported recently for GdBaCo 2 O 5.5+␦ . 7 To study electrode behavior, most of the previous studies have used porous electrodes, where uncertainties in the microstructure can lead to difficulties in interpretation of experimental results.…”

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confidence: 80%

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Oxygen exchange kinetics of epitaxial PrBaCo2O5+δ thin films

Kim

Wang

Jacobson

et al. 2006

Applied Physics Letters

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The oxygen exchange kinetics of thin films of the oxygen-deficient double perovskite PrBaCo2O5+δ (PBCO) have been determined by electrical conductivity relaxation (ECR) and by oxygen-isotope exchange and depth profiling (IEDP). Microstructural studies indicate that the PBCO films, prepared by pulsed laser deposition, have excellent single-crystal quality and epitaxial nature. The ECR and IEDP measurements reveal that the PBCO films have high electronic conductivity and rapid surface exchange kinetics, although the ECR data indicate the presence of two distinct kinetic pathways. The rapid surface kinetics compared with those of other perovskites suggest the application of PBCO as a cathode material in intermediate-temperature solid oxide fuel cells.

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confidence: 80%

“…Fig. 4, we have used the values for ⌫ previously measured for bulk polycrystalline PBCO 6 to make the comparison. In summary, the oxygen surface exchange kinetics of PBCO were measured using the electrical conductivity relaxation technique and verified by an independent IEDP measurement.…”

mentioning

confidence: 99%

Oxygen exchange kinetics of epitaxial PrBaCo2O5+δ thin films

Kim

Wang

Jacobson

et al. 2006

Applied Physics Letters

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130

129

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“…However, the chemical stability of BSCF in the presence of CO 2 and water vapor was questioned [23], indicating limits for practical applications. New materials showing promising performance, such as double perovskite or bismuth ruthenate pyrochlore, have been proposed as alternative cathodes [24,25].…”

Section: Intermediate Temperature Solid Oxide Fuel Cellsmentioning

confidence: 99%

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Fabbri

Pergolesi

Traversa

2010

Science and Technology of Advanced Materials

132

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High temperature proton conductor (HTPC) oxides are attracting extensive attention as electrolyte materials alternative to oxygen-ion conductors for use in solid oxide fuel cells (SOFCs) operating at intermediate temperatures (400-700• C). The need to lower the operating temperature is dictated by cost reduction for SOFC pervasive use. The major stake for the deployment of this technology is the availability of electrodes able to limit polarization losses at the reduced operation temperature. This review aims to comprehensively describe the state-of-the-art anode and cathode materials that have so far been tested with HTPC oxide electrolytes, offering guidelines and possible strategies to speed up the development of protonic SOFCs.

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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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Rapid oxygen ion diffusion and surface exchange kinetics in PrBaCo2O5+x with a perovskite related structure and ordered A cations

Cited by 552 publications

References 28 publications

Oxygen exchange kinetics of epitaxial PrBaCo2O5+δ thin films

Oxygen exchange kinetics of epitaxial PrBaCo2O5+δ thin films

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Defect equilibrium in PrBaCo2O5 at elevated temperatures

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