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

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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Effective Ca-doping in Y1−xCaxBaCo2O5+δ cathode materials for intermediate temperature solid oxide fuel cells

Journal of Materials Chemistry A ◽

10.1039/c7ta08954f ◽

2017 ◽

Vol 5 (48) ◽

pp. 25641-25651 ◽

Cited By ~ 15

Author(s):

Zhihong Du ◽

Chunlin Yan ◽

Hailei Zhao ◽

Yang Zhang ◽

Chunyang Yang ◽

...

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Structural Stability ◽

Cathode Materials ◽

Solid Oxide ◽

Intermediate Temperature ◽

Cell Performance ◽

Double Perovskites ◽

Oxide Fuel ◽

Ca Doping

Y1−xCaxBaCo2O5+δ double perovskites exhibit good structural stability and excellent cell performance, making them a promising cathode for IT-SOFCs.

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An Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr3Fe2O7−δ Electrodes for Solid Oxide Fuel Cells

Catalysts ◽

10.3390/catal11111400 ◽

2021 ◽

Vol 11 (11) ◽

pp. 1400

Author(s):

Longsheng Peng ◽

Qiang Li ◽

Liping Sun ◽

Hui Zhao

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Cathode Materials ◽

Electrocatalytic Activity ◽

Electrode Materials ◽

Elevated Temperatures ◽

Solid Oxide ◽

Oxide Fuel ◽

Effective Strategy ◽

Excellent Performance

The target of this work is to develop advanced electrode materials with excellent performance compared to conventional cathodes. Cobalt-free Ruddlesden−Popper oxides Sr3Fe2−xCuxO7−δ (SFCx, x = 0, 0.1, 0.2) were successfully synthesized and assessed as cathode materials for solid oxide fuel cells (SOFCs). Herein, a Cu-doping strategy is shown to increase the electrical conductivity and improve the electrochemical performance of the pristine Sr3Fe2O7−δ. Among all the cathode materials, the Sr3Fe1.9Cu0.1O7−δ (SFC10) cathode exhibits the best electrocatalytic activity for oxygen reduction reaction (ORR). The polarization resistance is 0.11 Ω cm2 and the peak power density of the single-cell with an SFC10 cathode reaches 955 mW cm−2 at 700 °C, a measurement comparable to cobalt-based electrodes. The excellent performance is owed to favorable oxygen surface exchange capabilities and larger oxygen vacancy concentrations at elevated temperatures. Moreover, the electrochemical impedance spectra and distribution of relaxation time results indicate that the charge transfer process at the triple-phase boundary is the rate-limiting step for ORR on the electrode. This work provides an effective strategy for designing novel cathode electrocatalysts for SOFCs.

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Synthesis of solid electrolyte compatible with cathode materials based on double perovskites for solid oxide fuel cells

BULLETIN of the L N Gumilyov Eurasian National University Physics Astronomy Series ◽

10.32523/2616-6836-2021-134-1-86-92 ◽

2021 ◽

Vol 134 (1) ◽

pp. 86-92

Author(s):

K. Кuterbekov ◽

◽

A. Kabyshev ◽

K. Bekmyrza ◽

M. Kubenova ◽

...

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Solid Electrolyte ◽

Cathode Materials ◽

Solid Oxide ◽

Double Perovskites ◽

Oxide Fuel

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NdBaFe2–xCoxO5+δ Double Perovskites with Exsolved Co–Fe Alloy Nanoparticles as Highly Efficient and Stable Anodes for Direct Hydrocarbon Solid Oxide Fuel Cells

ACS Applied Energy Materials ◽

10.1021/acsaem.0c02042 ◽

2020 ◽

Author(s):

Jiadong Jiang ◽

Ying Zhang ◽

Xin Yang ◽

Yu Shen ◽

Tianmin He

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Solid Oxide ◽

Alloy Nanoparticles ◽

Double Perovskites ◽

Oxide Fuel ◽

Highly Efficient

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Undoped Sr2MMoO6 Double Perovskite Molybdates (M = Ni, Mg, Fe) as Promising Anode Materials for Solid Oxide Fuel Cells

Materials ◽

10.3390/ma14071715 ◽

2021 ◽

Vol 14 (7) ◽

pp. 1715

Author(s):

Lubov Skutina ◽

Elena Filonova ◽

Dmitry Medvedev ◽

Antoine Maignan

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Anode Materials ◽

Functional Materials ◽

Double Perovskite ◽

Solid Oxide ◽

Sulfur Poisoning ◽

Oxide Fuel ◽

Fundamental Properties ◽

Main Emphasis

The chemical design of new functional materials for solid oxide fuel cells (SOFCs) is of great interest as a means for overcoming the disadvantages of traditional materials. Redox stability, carbon deposition and sulfur poisoning of the anodes are positioned as the main processes that result in the degradation of SOFC performance. In this regard, double perovskite molybdates are possible alternatives to conventional Ni-based cermets. The present review provides the fundamental properties of four members: Sr2NiMoO6-δ, Sr2MgMoO6-δ, Sr2FeMoO6-δ and Sr2Fe1.5Mo0.5O6-δ. These properties vary greatly depending on the type and concentration of the 3d-element occupying the B-position of A2BB’O6. The main emphasis is devoted to: (i) the synthesis features of undoped double molybdates, (ii) their electrical conductivity and thermal behaviors in both oxidizing and reducing atmospheres, as well as (iii) their chemical compatibility with respect to other functional SOFC materials and components of gas atmospheres. The information provided can serve as the basis for the design of efficient fuel electrodes prepared from complex oxides with layered structures.

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