Cobalt based layered perovskites as cathode material for intermediate temperature Solid Oxide Fuel Cells: A brief review

Pelosato, Renato; Cordaro, Giulio; Stucchi, Davide; Cristiani, Cinzia; Dotelli, Giovanni

doi:10.1016/j.jpowsour.2015.08.034

Cited by 252 publications

(136 citation statements)

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“…Nevertheless, there is a trend of lowering CTE with decreasing size of RE [4]. In this respect, YBaCo 2 O 6−δ has advantage as compared to other double perovskites since it has the lowest CTE among all REBaCo 2 O 6−δ oxides, which is close to that of doped ceria and zirconia, the state-of-the-art SOFC electrolytes [1][2][3][4][5][6]. is double perovskite was found to have the total conductivity high enough for using it as a cathode for IT SOFCs [6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 88%

“…Cobaltites REBaCo 2 O 6−δ , where REis a rare earth metal, with the double perovskite structure have attracted great attention in the past decade due to their unique properties such as high oxide ion and electronic conductivity as well as very promising activity as cathodes in IT SOFCs [1][2][3][4][5]. Despite the fascinating properties of these materials, their successful commercial application as cathodes is restricted by large thermal expansion coefficient (CTE), which significantly exceeds CTE of the stateof-the-art electrolyte materials [4].…”

Section: Introductionmentioning

confidence: 99%

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Oxygen Content and Thermodynamic Stability of YBaCo₂O_6−δ Double Perovskite

Sednev-Lugovets

Zuev

Цветков

2018

Advances in Materials Science and Engineering

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e thermodynamic stability of the double perovskite YBaCo 2 O 6−δ was studied using the coulometric titration technique and verified by measurements of the overall conductivity depending on oxygen partial pressure at a given temperature. As a result, the stability diagram of YBaCo 2 O 6−δ was plotted. YBaCo 2 O 6−δ was found to be thermodynamically stable in air at 850°C and higher temperatures, whereas its thermodynamic stability at 900°C is limited by the range of oxygen partial pressures −3.56 ≤ log(pO 2 /atm) ≤ −0.14. Oxygen content in YBaCo 2 O 6−δ slightly decreases at 900°C from 5.035 at log(pO 2 /atm) � −0.14 to 4.989 in the atmosphere with log(pO 2 /atm) � −3.565 indicating a crucial role which variation of Co +3 /Co +2 ratio plays in its stability. YBaCo 2 O 6−δ decomposes into the mixture of YCoO 3 and BaCoO 3−z at the high pO 2 stability limit, whereas

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Oxygen Content and Thermodynamic Stability of YBaCo₂O_6−δ Double Perovskite

Sednev-Lugovets

Zuev

Цветков

2018

Advances in Materials Science and Engineering

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“…[4][5][6] It has been reported that the lattice parameters of these structures can be tuned to yield high mixed electronic/ionic conductivity and high concentration of oxygen vacancies on the surface, two of which are the important descriptors of high ORR activity.…”

mentioning

confidence: 99%

Toward Stabilizing Co₃O₄Nanoparticles as an Oxygen Reduction Reaction Catalyst for Intermediate-Temperature SOFCs

Ren

Cheng

Gorte

et al. 2017

J. Electrochem. Soc.

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The oxygen reduction reaction (ORR) activity of a series of composite cathodes consisting of a porous Gd 0.20 Ce 0.80 O 2-δ (GDC) scaffold infiltrated with Sr-, Co-, and Y-nitrate solutions has been systematically investigated in this study. The results show that such infiltrated cathodes if calcined at low temperatures such as 350 • C exhibit low polarization resistance (R P ) in the temperature range of 450-700 • C, even though XRD analysis reveals that the calcined product is virtually a mixture of Co 3 O 4 and SrCO 3 . A further study by design-of-experiment suggests that the true ORR-active species is Co 3 O 4 , whereas SrCO 3 serves as a sintering inhibitor to preserve the high surface area of Reduced-temperature solid oxide fuel cells (RT-SOFCs) have the potential to be a commercially viable product due to improved durability and reduced cost, thus attracting a long lasting interest in the SOFC community. In the pursuit of RT-SOFCs, enhancing the kinetics of oxygen reduction reaction (ORR) is leading the development. There are two general approaches currently being practiced to achieve the enhanced ORR activity: 1) searching for new materials with a high intrinsic activity; 2) optimizing microstructure with maximal reactive sites.2,3 For the first approach, the research has been mostly focused on oxides with perovskite, double perovskite and RuddlesdenPopper intergrowth structures. [4][5][6] It has been reported that the lattice parameters of these structures can be tuned to yield high mixed electronic/ionic conductivity and high concentration of oxygen vacancies on the surface, two of which are the important descriptors of high ORR activity.7-9 For the second approach, nanoparticles (NPs) of an active material are introduced into a pre-existing microstructure (either a cathode or electrolyte porous scaffold) as a means of maximizing ORR-active reaction sites. The method of incorporation is solution infiltration/impregnation, 10-12 which has the advantage of allowing creation of NPs at much lower temperatures than scaffold sintering temperature, thus preserving nanostructures desirable for fast ORR.However, most of ORR-active materials found so far are complex oxides, the formation of which generally requires higher temperatures. For example, infiltrated Sr-and Co-doped LaFeO 3 (LSCF) NPs need ∼800• C to form the perovskite structure. 13,14 Under such a circumstance, the preferred nanostructures may be sintered into microstructures, resulting in a loss of the ORR-activity. Nevertheless, there are ample examples in the literature that show significant performance enhancement by high-temperature calcined NPs even though the original NPs have been coarsened to some degree. 11,12 On the other hand, low-temperature calcined NPs have also been shown with high performance even though the desirable phase is not formed at the first place. For example, researchers from Riso recently observed a very low R p for infiltrated La 0.6 Sr 0.4 CoO 3-δ NPs calcined at 350• C, 15,16 where perovskite phase cannot be formed. U...

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“…Besides, our results show that Sm-based cathodes display better performance than Gd-based ones in agreement with previous reports. 22 The main contribution to ASR is bulk diffusion of oxide ions, with a minor low frequency contribution ascribed to dissociative adsorption and gas phase diffusion.…”

mentioning

confidence: 99%

Nanostructured LnBaCo2O6−𝜹 (Ln = Sm, Gd) with layered structure for intermediate temperature solid oxide fuel cell cathodes

et al. 2017

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We evaluated for the first time the use of nanostructured layered perovskites of formulae LnBaCo 2 O 6-d with Ln = Sm and Gd (SBCO and GBCO, respetively) as SOFC cathodes, finding promising electrochemical properties in the intermediate temperature range (~700°C). The synthesis of these nanomaterials, not reported before, was achieved by using porous templates to confine the chemical reagents in regions of about 200 nm and 800 nm. The performance of nanostructured SBCO and GBCO cathodes for the oxygen reduction reaction was analyzed in symmetrical cells using Gd 2 O 3 -doped CeO 2 (GDC) as electrolyte. For this purpose, nanostructured SBCO and GBCO cathodes were deposited on both sides of the electrolyte by a simple thick-film procedure and evaluated by Electrochemical Impedance Spectroscopy technique under different operating conditions. We found that cathodes synthesized using smaller template pores exhibited better performance. Besides, SBCO cathodes displayed lower area-specific resistance than GBCO ones.

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Cobalt based layered perovskites as cathode material for intermediate temperature Solid Oxide Fuel Cells: A brief review

Cited by 252 publications

References 121 publications

Oxygen Content and Thermodynamic Stability of YBaCo₂O_6−δ Double Perovskite

Oxygen Content and Thermodynamic Stability of YBaCo₂O_6−δ Double Perovskite

Toward Stabilizing Co₃O₄Nanoparticles as an Oxygen Reduction Reaction Catalyst for Intermediate-Temperature SOFCs

Nanostructured LnBaCo2O6−𝜹 (Ln = Sm, Gd) with layered structure for intermediate temperature solid oxide fuel cell cathodes

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Cobalt based layered perovskites as cathode material for intermediate temperature Solid Oxide Fuel Cells: A brief review

Cited by 252 publications

References 121 publications

Oxygen Content and Thermodynamic Stability of YBaCo2O6−δ Double Perovskite

Oxygen Content and Thermodynamic Stability of YBaCo2O6−δ Double Perovskite

Toward Stabilizing Co3O4Nanoparticles as an Oxygen Reduction Reaction Catalyst for Intermediate-Temperature SOFCs

Nanostructured LnBaCo2O6−𝜹 (Ln = Sm, Gd) with layered structure for intermediate temperature solid oxide fuel cell cathodes

Contact Info

Product

Resources

About

Oxygen Content and Thermodynamic Stability of YBaCo₂O_6−δ Double Perovskite

Oxygen Content and Thermodynamic Stability of YBaCo₂O_6−δ Double Perovskite

Toward Stabilizing Co₃O₄Nanoparticles as an Oxygen Reduction Reaction Catalyst for Intermediate-Temperature SOFCs