Combinatorial development of nanocrystalline/amorphous (La,Sr)CoO3-(La,Sr)2CoO4 composite cathodes for IT-SOFCs

Pişkin, Fatih; Torunoglu, Ziya Cagri; Yaşar, Bengisu; Kalay, Yunus Eren; Őztürk, Tayfur

doi:10.1016/j.ssi.2018.10.003

Cited by 12 publications

(8 citation statements)

References 20 publications

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“….-EIS responses of co-sputtered oxide cathodes covering compositions between LSC113:LSC214 = 0.10:0.90 -0.90:0.10 were investigated previously and reported in detail by Sari et al 7 Based on these results, a set of co-sputtered cathodes were prepared and subjected to extended testing at selected temperatures. Since the area specific resistance value of ASR = 0.15 ohm cm 2 provides useful benchmark for SOFC cathode, this provided the basis for temperature selection.…”

Section: Structural Stability In Co-sputtered Lsc113/lsc214mentioning

confidence: 98%

“…In a more recent study, compositional optimization and performance maximization was achieved with the help of co-sputtering of LSC-113 and LSC-214 phases. 7 Although hetero-structured LSC-113/LSC-214 composite cathodes show very high oxygen reduction reaction (ORR) activity, they generally suffer from low chemical stability. 8 At temperatures above 400°C, negatively charged strontium dopants start to diffuse toward positively charged oxygen vacancies which are generally occupied at the surface of the cathode.…”

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confidence: 99%

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Segregation Resistant Nanocrystalline/Amorphous (La, Sr) CoO₃-(La,Sr)₂CoO₄ Composite Cathodes for IT-SOFCs

Yaşar

Pişkin

Kalay

et al. 2019

J. Electrochem. Soc.

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There is a considerable interest in lowering the operating temperature of solid oxide fuel cells. In this respect, (La,Sr)CoO 3 -(La,Sr) 2 CoO 4 dual phase oxides have attracted much attention as cathode materials due to their enhanced oxygen reduction reaction kinetics. The main drawback in lanthanum strontium cobaltite cathodes is Sr-segregation at operating temperatures which causes a sudden degradation in performance. In the current study, this segregation is verified by a specially designed experiment where a (La 0.8 Sr 0.2 )CoO 3 -(La 0.5 Sr 0.5 ) 2 CoO 4 bilayer is deposited and annealed for an extended period of time. Thin film cathodes are then deposited via co-sputtering of (La 0.8 Sr 0.2 )CoO 3 and (La 0.5 Sr 0.5 ) 2 CoO 4 yielding non-crystalline structures with acceptable area specific resistance values at temperatures as low as 575°C. The stability of these cathodes is investigated over an extensive range of compositions (La 0.8 Sr 0.2 )CoO 3 : (La 0.5 Sr 0.5 ) 2 CoO 4 = 0.10:0.90 -0.90:0.10. Prolonged annealing of cathodes at temperature of the same initial area specific resistance shows an exceptionally stable cathode performance as measured by electrochemical impedance spectroscopy responses. It is therefore concluded that co-sputtered (La 0.8 Sr 0.2 )CoO 3 -(La 0.5 Sr 0.5 ) 2 CoO 4 dual phase cathodes with their amorphous/nanocrystalline structures, especially at mid-compositions, provide an extremely stable microstructure with a strong resistance to Sr segregation.

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Section: Structural Stability In Co-sputtered Lsc113/lsc214mentioning

confidence: 98%

mentioning

confidence: 99%

Segregation Resistant Nanocrystalline/Amorphous (La, Sr) CoO₃-(La,Sr)₂CoO₄ Composite Cathodes for IT-SOFCs

Yaşar

Pişkin

Kalay

et al. 2019

J. Electrochem. Soc.

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“…The authors speculated that the post-crystallized amorphous VAN exhibits the highest activity due to their large TPB density. Interestingly, Sari et al [43] also observed a considerably high activity and low specific resistance for co-sputtered amorphous films obtained using LSC 113 and LSC 214 targets.…”

Section: Epitaxial Superlattices and Vertically Aligned Nanocomposites For Cathodesmentioning

confidence: 99%

Nanostructured Materials and Interfaces for Advanced Ionic Electronic Conducting Oxides

Acosta

Baiutti

Tarancón

et al. 2019

Adv Materials Inter

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Mixed ionic electronic conductors (MIEC) are pivotal materials in a number of electrochemical devices which are relevant for clean energy technologies and industrial chemical processes. In this report progress, we provide an overview of the recent strategies to tune surfaces and interfaces of MIEC fluorite and perovskite oxides for solid oxide fuel cells and micro-solid oxide fuel cells electrodes. Most of the works presented focus on salient strategies to improve the oxygen reduction reaction (ORR) and the fuel oxidation reaction kinetics. We provide insights on the current understanding of heterointerfaces in epitaxial thin films and vertically aligned nanocomposites for ORR kinetics. A selection of oxide materials having potential for thin-film anode application is also presented. We further discuss recent salient results in grain boundary engineering and ex-solution as well as strain engineering and photoactivation for the development of advanced electrodes.

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“…Thin-film sputter deposition of SCY, using the target produced with the applied procedure, was carried out in a custom-configured magnetron sputtering system [27][28][29][30][31]. The system has RF sputter guns accommodating targets in 50 mm diameter.…”

Section: Thin Film Sputter Deposition Of Srce095yb005o3mentioning

confidence: 99%

Preparation of Yb-Doped Srceo3 Sputter Targets for Protonic Solid Oxide Fuel Cells

PİŞKİN

2022

Mugla Journal of Science and Technology

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A comprehensive study was carried out starting from powder synthesis to sintering procedure in order to produce a phasepure SrCe0.95Yb0.05O3-δ sputter target. In the powder synthesis, the effect of chelating and polymerization agents on the formation of single-phase SrCe0.95Yb0.05O3-δ was investigated in detail. In this regard, citric acid, EDTA, and their combinations in different ratios were evaluated as chelating agents. The calcination temperature, ranging from 1000 °C to 1300 °C, was also investigated to reveal its effect on the formation of possible secondary phases. Following the powder synthesis, SrCe0.95Yb0.05O3-δ sputter target with dimensions of 50 mm diameter and 3 mm thickness was produced by powder pressing with deformable compaction die and the subsequent sintering at 1300 °C for 10 hours. A relative density of 0.95 was achieved in SrCe0.95Yb0.05O3-δ targets as a result of the procedure in question without the use of a sintering aid.

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Combinatorial development of nanocrystalline/amorphous (La,Sr)CoO3-(La,Sr)2CoO4 composite cathodes for IT-SOFCs

Cited by 12 publications

References 20 publications

Segregation Resistant Nanocrystalline/Amorphous (La, Sr) CoO₃-(La,Sr)₂CoO₄ Composite Cathodes for IT-SOFCs

Segregation Resistant Nanocrystalline/Amorphous (La, Sr) CoO₃-(La,Sr)₂CoO₄ Composite Cathodes for IT-SOFCs

Nanostructured Materials and Interfaces for Advanced Ionic Electronic Conducting Oxides

Preparation of Yb-Doped Srceo3 Sputter Targets for Protonic Solid Oxide Fuel Cells

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Combinatorial development of nanocrystalline/amorphous (La,Sr)CoO3-(La,Sr)2CoO4 composite cathodes for IT-SOFCs

Cited by 12 publications

References 20 publications

Segregation Resistant Nanocrystalline/Amorphous (La, Sr) CoO3-(La,Sr)2CoO4 Composite Cathodes for IT-SOFCs

Segregation Resistant Nanocrystalline/Amorphous (La, Sr) CoO3-(La,Sr)2CoO4 Composite Cathodes for IT-SOFCs

Nanostructured Materials and Interfaces for Advanced Ionic Electronic Conducting Oxides

Preparation of Yb-Doped Srceo3 Sputter Targets for Protonic Solid Oxide Fuel Cells

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Product

Resources

About

Segregation Resistant Nanocrystalline/Amorphous (La, Sr) CoO₃-(La,Sr)₂CoO₄ Composite Cathodes for IT-SOFCs

Segregation Resistant Nanocrystalline/Amorphous (La, Sr) CoO₃-(La,Sr)₂CoO₄ Composite Cathodes for IT-SOFCs