Thermal stability of Ln2NiO4+δ (Ln: La, Pr, Nd) and their chemical compatibility with YSZ and CGO solid electrolytes

Montenegro-Hernández, Alejandra; Vega-Castillo, J.; Mogni, L.; Caneiro, A.

doi:10.1016/j.ijhydene.2011.08.105

Cited by 149 publications

(101 citation statements)

References 36 publications

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“…EDS analyses showed that this material was composed of Ni, La and Zr, and electron diffraction studies were in accordance with a polycrystalline structure. These results are in agreement with previously reported X-Ray Diffraction (XRD) data, that allowed the identification of the insulating phase La 2 Zr 2 O 7 [8]. In consequence, FIB-TEM analyses resulted in precise information about the location and extent of this new phase and its composition.…”

Section: Case 1: Interphases Showing Chemical Reactivitysupporting

confidence: 91%

Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy

Soldati

Montenegro-Hernández

Baqué

et al. 2014

Practical Metallography

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The Focused Ion Beam (FIB) technique was used to prepare site-specific samples from interfacial regions of different solid oxide fuel cells assemblies. Transmission and Scanning Electron Microscopy on the FIB foils combined with Electrochemical Impedance Spectroscopy (EIS) allowed the characterization of the electrode/electrolyte interphases and the determination of its influence on the cell performance after longterm operation conditions. This work reviews two cases: on one hand, Ln 2 NiO 4+δ (Ln= La, Nd) cathodes deposited on both Y 0.08 Zr 0.92 O 1.96 and Ce 0.9 Gd 0.1 O 1.95 electrolytes, that react at 900 °C during the adhesion treatment and at temperatures higher than 650 °C during the EIS measurements. These samples present a reaction layer of 10 nm thickness, which contains elements of both phases and was found responsible of the cell performance degradation. On the other hand, La 0.4 Sr 0.6 Co 0.8 Fe 0.2 O 3-δ cathodes showed excelent performance on Ceria electrolytes, even after 1000 hours at operation conditions. In that case, the microscopic analyses of FIB foils showed a semi-coherent interphase growth.

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Section: Case 1: Interphases Showing Chemical Reactivitysupporting

confidence: 91%

Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy

Soldati

Montenegro-Hernández

Baqué

et al. 2014

Practical Metallography

View full text Add to dashboard Cite

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“…[ 298 ] As a result, the Pr 2 NiO 4 cathode seemed more promising because of its long-term stable performance. Since the phase structure of Pr 2 NiO 4 at 750 °C was actually not stable, [ 299,300 ] [ 301 ] In addition to the application as a cathode for SOFCs based on oxygen ion conductors, Pr 2 NiO 4 was even more extensively applied as a cathode for SOFCs based on protonic conductors. [ 281,[302][303][304][305][306] Among the LnNi 2 O 4 (Ln = La, Pr, Nd) series, Pr 2 NiO 4 also showed the highest activity for ORR on proton conducting electrolytes.…”

Section: Ruddlesden-popper-type Metal Oxidesmentioning

confidence: 99%

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

Chen

Zhou

Ding

et al. 2015

Advanced Energy Materials

254

155

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Solid oxide fuel cells (SOFCs) represent one of the cleanest and most efficient options for the direct conversion of a wide variety of fuels to electricity. For example, SOFCs powered by natural gas are ideally suited for distributed power generation. However, the commercialization of SOFC technologies hinges on breakthroughs in materials development to dramatically reduce the cost while enhancing performance and durability. One of the critical obstacles to achieving high‐performance SOFC systems is the cathodes for oxygen reduction reaction (ORR), which perform poorly at low temperatures and degrade over time under operating conditions. Here a comprehensive review of the latest advances in the development of SOFC cathodes is presented: complex oxides without alkaline earth metal elements (because these elements could be vulnerable to phase segregation and contaminant poisoning). Various strategies are discussed for enhancing ORR activity while minimizing the effect of contaminant on electrode durability. Furthermore, some of the critical challenges are briefly highlighted and the prospects for future‐generation SOFC cathodes are discussed. A good understanding of the latest advances and remaining challenges in searching for highly active SOFC cathodes with robust tolerance to contaminants may provide useful guidance for the rational design of new materials and structures for commercially viable SOFC technologies.

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“…Chemical reactions were observed in case of both YSZ and CGO electrolytes [2]. It was also shown that La 2 NiO 4 was not chemically compatible with LSGM electrolyte neither at fabrication conditions nor at operation ones [3].…”

Section: Introductionmentioning

confidence: 94%

“…Chemical compatibility of La 2 NiO 4 with electrolytes such as YSZ, CGO, and LSGM was previously studied [2,3]. Chemical reactions were observed in case of both YSZ and CGO electrolytes [2].…”

Section: Introductionmentioning

confidence: 99%

“…It is considered as a promising cathode material for solid oxide fuel cells (SOFC) due to a number of advantages such as relatively fast oxygen-ion transport via interstitial oxygen ions, moderate thermal expansion, and high electrocatalytic activity. Nevertheless, it has a few shortcomings such as relatively low total conductivity and chemical incompatibility with various well-known electrolytes [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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