The origin of triple conductivity and water uptake in layered double perovskites: A case study on lanthanum-substituted GdBaCo2O6−δ

Malyshkin, Dmitry A.; Novikov, Andrey; Ivanov, Ivan L.; Sereda, Vladimir V.; Цветков, Д. С.; Zuev, A. Yu.

doi:10.1016/j.jallcom.2020.156309

Cited by 13 publications

(13 citation statements)

References 22 publications

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“…The authors conclude that PBCO and GBCO act principally as MIEC materials in PCFC devices, although proton conductivity may be involved to a small extent. Recent work by Malyshkin et al [111] also paints a complex picture as regards the location of protons and their role in the electrochemical reaction in double perovskites. The authors indicate that whereas the single-phase, double perovskite Gd 0.8 La 0.2 Ba 0.95 La 0.05 Co 2 O 6-δ does not hydrate, the impurity phase BaCo 0.8 Gd 0.2 O 3−δ absorbs a significant amount of water.…”

Section: Triple Proton Oxide Ion Electron Hole-conducting Oxidesmentioning

confidence: 99%

Perspectives on Cathodes for Protonic Ceramic Fuel Cells

et al. 2021

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Protonic ceramic fuel cells (PCFCs) are promising electrochemical devices for the efficient and clean conversion of hydrogen and low hydrocarbons into electrical energy. Their intermediate operation temperature (500–800 °C) proffers advantages in terms of greater component compatibility, unnecessity of expensive noble metals for the electrocatalyst, and no dilution of the fuel electrode due to water formation. Nevertheless, the lower operating temperature, in comparison to classic solid oxide fuel cells, places significant demands on the cathode as the reaction kinetics are slower than those related to fuel oxidation in the anode or ion migration in the electrolyte. Cathode design and composition are therefore of crucial importance for the cell performance at low temperature. The different approaches that have been adopted for cathode materials research can be broadly classified into the categories of protonic–electronic conductors, oxide-ionic–electronic conductors, triple-conducting oxides, and composite electrodes composed of oxides from two of the other categories. Here, we review the relatively short history of PCFC cathode research, discussing trends, highlights, and recent progress. Current understanding of reaction mechanisms is also discussed.

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Section: Triple Proton Oxide Ion Electron Hole-conducting Oxidesmentioning

confidence: 99%

Perspectives on Cathodes for Protonic Ceramic Fuel Cells

et al. 2021

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“…We should note that LODPs, such as Ln Ba 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ ( Ln = Pr, Nd), when used as cathodes for proton-conducting SOFCs, also belong to the class of TCOs [ 9 , 44 ]. According to [ 48 ], triple conductivity in LODPs can appear due to the formation of impurity phases, which should be taken into account for the development of new TCOs.…”

Section: Cathode Materials For It–sofcs: Past Present and Futurementioning

confidence: 99%

Layered Oxygen-Deficient Double Perovskites as Promising Cathode Materials for Solid Oxide Fuel Cells

et al. 2021

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Development of new functional materials with improved characteristics for solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) is one of the most important tasks of modern materials science. High electrocatalytic activity in oxygen reduction reactions (ORR), chemical and thermomechanical compatibility with solid electrolytes, as well as stability at elevated temperatures are the most important requirements for cathode materials utilized in SOFCs. Layered oxygen-deficient double perovskites possess the complex of the above-mentioned properties, being one of the most promising cathode materials operating at intermediate temperatures. The present review summarizes the data available in the literature concerning crystal structure, thermal, electrotransport-related, and other functional properties (including electrochemical performance in ORR) of these materials. The main emphasis is placed on the state-of-art approaches toimproving the functional characteristics of these complex oxides.

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“…The double perovskite Ba 1−x Gd 1−y La x+y Co 2 O 6−δ (BGLC) has shown good performance as a positrode (oxygen electrode) for Proton Ceramic Electrochemical Cells (PCECs). 1,2 The structural properties entail several crystallographic and chemical phases, 3 depending on the stoichiometry factors x and yboth reflecting La, substituted for Ba (x) and Gd (y). Furthermore, the thermal and chemical expansion is vital for mechanical stability when this materials class is applied as PCEC electrodes and subjected to large variations in tempera-ture and chemical environment.…”

Section: Introductionmentioning

confidence: 99%