Oxygen Reduction Reaction Properties of Cobalt-Free Perovskites for SOFCs

Singh, Kalpana; Sahoo, Akankshya; Thangadurai, Venkataraman

doi:10.1149/07801.0479ecst

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…TGA of (a) Ba 0.5 Sr 0.5 Fe 0.91 Al 0.09 O 3‑δ (BSFAl) and (b) Ba 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3‑δ (BSFCu) in air/N 2 (50:50 volume ratio) for three consecutive heating and cooling cycles. Solid lines represent the heating and dotted lines represent the cooling stages …”

Section: Resultsmentioning

confidence: 99%

“…Our approach is ideal for comparative studies, where a method to carefully screen different cathode and electrolyte assemblies is presented here, in order to find the optimal parameters of the systems in an objective and thorough manner. We further analyze and discuss the ORR performance of Co-free perovskite-type Ba 0.5 Sr 0.5 Fe 0.91 Al 0.09 O 3‑δ (BSFAl) and Ba 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3‑δ (BSFCu) as IT-cathodes for LSGM and BSCZGY electrolytes in air, through combined electrochemical impedance spectroscopy and ISGP that were reported in conference proceedings. , …”

Section: Theoretical Aspectsmentioning

confidence: 99%

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Understanding of Oxygen Reduction Reaction on Perovskite-Type Ba_0.5Sr_0.5Fe_0.91Al_0.09O_3-δ and Ba_0.5Sr_0.5Fe_0.8Cu_0.2O_3-δ Using AC Impedance Spectroscopy Genetic Programming

Singh

Gelman

et al. 2018

J. Phys. Chem. C

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Fundamental understanding of the oxygen reduction reaction (ORR) mechanism in electrochemical cells (e.g., solid oxide fuel cells (SOFCs)) is rather challenging because of several processes, which occur with similar time constants. Also, it is very difficult to elucidate ORR reaction steps using a conventional equivalent circuit modeling in ac impedance spectroscopy. There is no unique model to fully explain the ORR mechanism, especially in high temperature SOFCs. In this study, attempt has been made using impedance spectroscopy genetic programming (ISGP) technique to describe SOFC cathode ORR processes. Using ISGP, we analyzed the electrochemical performance of Ba 0.5 Sr 0.5 Fe 0.91 Al 0.09 O 3-δ (BSFAl) and Ba 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3-δ (BSFCu) cathodes with oxide ion conducting La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ (LSGM) and proton conducting Ba 0.5 Sr 0.5 Ce 0.6 Zr 0.2 Gd 0.1 Y 0.1 O 3-δ (BSCZGY) electrolytes. The ORR mechanism is explained by finding the distribution function of relaxation time (DFRT) with the help of ISGP. By monitoring the changes in the DFRT models at different temperatures and using both oxide ion and proton conducting electrolytes, we are able to deconvolute the ORR to its several polarization subprocesses. Using the present approach, it is possible to gain additional information, which may be convoluted and therefore undetected in conventional impedance analysis. The analysis procedure results in a direct and unambiguous DFRT model, with a distinct physical meaning. Therefore, making it especially beneficial in comparative studies, as demonstrated in this work, where it was found that BSFCu-LSGM cathode showed better charge-transfer properties than BSFAl-LSGM cathode, due to higher conductivity of BSFCu phase. In both BSCZGY-BSFCu and BSCZGY-BSFAl cathodes, the rate-limiting step was found to be the charge-transfer process, owing to low electrical (ionic) conductivity of BSCZGY.

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Section: Resultsmentioning

confidence: 99%

Section: Theoretical Aspectsmentioning

confidence: 99%

Understanding of Oxygen Reduction Reaction on Perovskite-Type Ba_0.5Sr_0.5Fe_0.91Al_0.09O_3-δ and Ba_0.5Sr_0.5Fe_0.8Cu_0.2O_3-δ Using AC Impedance Spectroscopy Genetic Programming

Singh

Gelman

et al. 2018

J. Phys. Chem. C

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“…In MIECs, BaCoO 3−δ -based perovskite oxides with high conductivity and high electrocatalytic activity for the ORR have been extensively studied. The excellent electrical conductivity comes from the small charge transfer gap and good bond strength between Co and O ions. , Besides, large Ba ions can lead to a large free volume and thus reduce the migration E a of oxygen ions in the lattice . However, there is a problem for pure BaCoO 3 that the phase structure is easy to transform from cubic to hexagonal with decreasing the temperature.…”

Section: Introductionmentioning

confidence: 99%

A-Site Nonstoichiometric Ba_xCo_0.4Fe_0.4Zr_0.1Y_0.1O_3−δ Cathode for Protonic Ceramics Fuel Cells

Wei,

Guo,

Chen

et al. 2023

ACS Appl. Mater. Interfaces

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Highly active triple (proton, oxygen-ion, and electron) conducting materials Ba x Co 0.4 Fe 0.4 Zr 0.1 Y 0.1 O 3−δ (BxCFZY, x = 0.9−1.1) were prepared and characterized as potential cathodes for protonic ceramic fuel cells (PCFCs) in this work. The crystal structure, oxygen vacancy concentration, electrical conductivity, oxygen ion transfer properties, and electrochemical performance of BxCFZY oxides were systematically evaluated. The electrical conductivity of BxCFZY decreases but oxygen vacancies increase with increasing Ba content, indicating that the charge compensation was mainly achieved by the production of oxygen vacancy rather than the increase in the valence of transition metal cations. The power density of 1170 mW cm −2 and the polarization resistance of 0.05 Ω cm 2 were achieved at 700 °C for the anode-supported single cells with B1.1CFZY cathode, suggesting that the excess A site on the BxCFZY had a positive effect on the catalytic activity for the oxygen reduction reaction. Furthermore, the distribution of relaxation time (DRT) analysis method was adopted to determine the electrochemical processes of the cells with BxCFZY cathodes. The calculated results confirmed that the cell with B1.1CFZY cathode exhibited the optimum performance due to the best oxygen ion transfer properties in BxCFZY cathodes. KEYWORDS: protonic ceramics fuel cells, Ba x Co 0.4 Fe 0.4 Zr 0.1 Y 0.1 O 3−δ , charge compensation, DRT, oxygen transfer properties

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Recent Advances in Barium Cobaltite‐Based Perovskite Oxides as Cathodes for Intermediate‐Temperature Solid Oxide Fuel Cells

Song,

Yi,

Ran

et al. 2024

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Solid oxide fuel cells (SOFCs) are considered as advanced energy conversion technologies due to the high efficiency, fuel flexibility, and all‐solid structure. Nevertheless, their widespread applications are strongly hindered by the high operational temperatures, limited material selection choices, inferior long‐term stability, and relatively high costs. Therefore, reducing operational temperatures of SOFCs to intermediate‐temperature (IT, 500–800 °C) range can remarkably promote the practical applications by enabling the use of low‐cost materials and enhancing the cell stability. Nevertheless, the conventional cathodes for high‐temperature SOFCs display inferior electrocatalytic activity for oxygen reduction reaction (ORR) at reduced temperatures. Barium cobaltite (BaCoO3‐δ)‐based perovskite oxides are regarded as promising cathodes for IT‐SOFCs because of the high free lattice volume and large oxygen vacancy content. However, BaCoO3‐δ‐based perovskite oxides suffer from poor structural stability, inferior thermal compatibility, and insufficient ionic conductivity. Herein, an in‐time review about the recent advances in BaCoO3‐δ‐based cathodes for IT‐SOFCs is presented by emphasizing the material design strategies including functional/selectively doping, deficiency control, and (nano)composite construction to enhance the ORR activity/durability and thermal compatibility. Finally, the currently existed challenges and future research trends are presented. This review will provide valuable insights for the development of BaCoO3‐δ‐based electrocatalysts for various energy conversion/storage technologies.

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Oxygen Reduction Reaction Properties of Cobalt-Free Perovskites for SOFCs

Cited by 4 publications

References 33 publications

Understanding of Oxygen Reduction Reaction on Perovskite-Type Ba_0.5Sr_0.5Fe_0.91Al_0.09O_3-δ and Ba_0.5Sr_0.5Fe_0.8Cu_0.2O_3-δ Using AC Impedance Spectroscopy Genetic Programming

Understanding of Oxygen Reduction Reaction on Perovskite-Type Ba_0.5Sr_0.5Fe_0.91Al_0.09O_3-δ and Ba_0.5Sr_0.5Fe_0.8Cu_0.2O_3-δ Using AC Impedance Spectroscopy Genetic Programming

A-Site Nonstoichiometric Ba_xCo_0.4Fe_0.4Zr_0.1Y_0.1O_3−δ Cathode for Protonic Ceramics Fuel Cells

Recent Advances in Barium Cobaltite‐Based Perovskite Oxides as Cathodes for Intermediate‐Temperature Solid Oxide Fuel Cells

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Oxygen Reduction Reaction Properties of Cobalt-Free Perovskites for SOFCs

Cited by 4 publications

References 33 publications

Understanding of Oxygen Reduction Reaction on Perovskite-Type Ba0.5Sr0.5Fe0.91Al0.09O3-δ and Ba0.5Sr0.5Fe0.8Cu0.2O3-δ Using AC Impedance Spectroscopy Genetic Programming

Understanding of Oxygen Reduction Reaction on Perovskite-Type Ba0.5Sr0.5Fe0.91Al0.09O3-δ and Ba0.5Sr0.5Fe0.8Cu0.2O3-δ Using AC Impedance Spectroscopy Genetic Programming

A-Site Nonstoichiometric BaxCo0.4Fe0.4Zr0.1Y0.1O3−δ Cathode for Protonic Ceramics Fuel Cells

Recent Advances in Barium Cobaltite‐Based Perovskite Oxides as Cathodes for Intermediate‐Temperature Solid Oxide Fuel Cells

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Understanding of Oxygen Reduction Reaction on Perovskite-Type Ba_0.5Sr_0.5Fe_0.91Al_0.09O_3-δ and Ba_0.5Sr_0.5Fe_0.8Cu_0.2O_3-δ Using AC Impedance Spectroscopy Genetic Programming

Understanding of Oxygen Reduction Reaction on Perovskite-Type Ba_0.5Sr_0.5Fe_0.91Al_0.09O_3-δ and Ba_0.5Sr_0.5Fe_0.8Cu_0.2O_3-δ Using AC Impedance Spectroscopy Genetic Programming

A-Site Nonstoichiometric Ba_xCo_0.4Fe_0.4Zr_0.1Y_0.1O_3−δ Cathode for Protonic Ceramics Fuel Cells