High Performance Cathodes for Solid Oxide Fuel Cells Prepared by Infiltration of La0.6Sr0.4CoO3−δ into Gd-Doped Ceria

Samson, Alfred Junio; Søgaard, Martin; Knibbe, Ruth; Bonanos, Nikolaos

doi:10.1149/1.3571249

Cited by 84 publications

(118 citation statements)

References 36 publications

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“…Cell A and cell B were sintered at 1,150°C which results in an approximate porosity of 64 % and thickness of 50 μm [6]. The symmetrical cells were cut into samples of an approximately nominal area of 5×5 mm 2 .…”

Section: Methodsmentioning

confidence: 99%

“…The suggested structure finally provides two full percolated phases as both CGO10 and LSC are formed sequentially and not randomly which is favorable in terms of electronic and oxide ion transport. The electrochemical performance of such a structure has been described earlier [6].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, it has been shown that nano-particles of [7,8] infiltrated into conventional LSM:YSZ cathodes can significantly reduce its polarization resistance. There is also work reported on LSC [6], LSCF [9,10], and Sm 0.5 Sr 0.5 CoO 3 (SSC) [11] infiltrated into porous CGO backbones with excellent electrochemical performance. These three compositions are all known to react with YSZ at elevated temperatures, preventing YSZ to be used as the backbone material.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical performance and stability of nano-particulate and bi-continuous La1−X Sr X CoO3 and Ce0.9Gd0.1O1.95 composite electrodes

Hjalmarsson

Hallinder

Mogensen

2012

J Solid State Electrochem

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A bi-continuous porous cathode consisting of nano-particles of strontium substituted lanthanum cobaltite (LSC) covering the surface of a Ce 0.9 Gd 0.1 O 1.95 (CGO10) backbone has been produced. The polarization resistance (R P ) of this cathode was measured to ∼35 mΩ cm 2 at 650°C. The area-specific resistance at 650°C (ASR) when applied onto an anode supported cell (ASC) was found to increase from 540 to 730 mΩ cm 2 when subjected to a thermal cycle to 850°C. This effect was attributed to particles coarsening but also to a reaction with the electrolyte. The results imply that a CGO10 barrier is required for this type of nano-structured cathode.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical performance and stability of nano-particulate and bi-continuous La1−X Sr X CoO3 and Ce0.9Gd0.1O1.95 composite electrodes

Hjalmarsson

Hallinder

Mogensen

2012

J Solid State Electrochem

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“…The nano-Pt composition was chosen for its high stability and low reactivity with the LSCF composition; therefore, the processing benefits can be directly evaluated without misinterpretation due to potential chemical interaction or surface modification of the LSCF cathode backbone (as is the case for nano-Ag or -Cu oxide incorporation) [16][17][18]. The amount of catalyst per infiltration step was monitored.…”

Section: Resultsmentioning

confidence: 99%

Direct foamed and nano-catalyst impregnated solid-oxide fuel cell (SOFC) cathodes

et al. 2013

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electrolyte coated with a porous $ 10 mm thick cathode active layer. The YSZ electrolyte was $ 110 mm in thickness, and a full cell was created by application of a Ni/(Ce 0.9 Gd 0.1 )O 2 cermetas the baseline anode. Cells possessing the foamed LSCF cathode were compared to cells constructed via standard methods in terms of resultant microstructure, electrochemical performance, and introceptive character. The foamed cathode tended to possess a high level of tortuous porosity which was ellipsoidal and interconnected in character. Both the standard and foamed cathode structures were subjected to an infiltration process, and the resultant microstructure was examined. The impregnation efficiency of the foamed cathode was at least $ 10% greater per deposition than that of an unfoamed porous LSCF cathode. The SOFC with the Pt nano-catalyst impregnated foamed cathode demonstrated a maximum power density of 593 mW/cm 2 utilizing wet H 2 fuel, which is 52% higher than a SOFC with the baseline Pt-impregnated LSCF cathode ( $ 390 mW/cm 2 ) at 800 1C. The cathode compositional and microstructural alterations obtainable by foaming led to the elevated power performance, which was shown to be quite high relative to standard SOFCs with a thick YSZ electrolyte.

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“…• C, 15,16 where perovskite phase cannot be formed. Unfortunately, the true ORR-active phase was not identified in the study.…”

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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High Performance Cathodes for Solid Oxide Fuel Cells Prepared by Infiltration of La0.6Sr0.4CoO3−δ into Gd-Doped Ceria

Cited by 84 publications

References 36 publications

Electrochemical performance and stability of nano-particulate and bi-continuous La1−X Sr X CoO3 and Ce0.9Gd0.1O1.95 composite electrodes

Electrochemical performance and stability of nano-particulate and bi-continuous La1−X Sr X CoO3 and Ce0.9Gd0.1O1.95 composite electrodes

Direct foamed and nano-catalyst impregnated solid-oxide fuel cell (SOFC) cathodes

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

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High Performance Cathodes for Solid Oxide Fuel Cells Prepared by Infiltration of La0.6Sr0.4CoO3−δ into Gd-Doped Ceria

Cited by 84 publications

References 36 publications

Electrochemical performance and stability of nano-particulate and bi-continuous La1−X Sr X CoO3 and Ce0.9Gd0.1O1.95 composite electrodes

Electrochemical performance and stability of nano-particulate and bi-continuous La1−X Sr X CoO3 and Ce0.9Gd0.1O1.95 composite electrodes

Direct foamed and nano-catalyst impregnated solid-oxide fuel cell (SOFC) cathodes

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

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