Electrical Conductivity and Oxygen Exchange Kinetics of La[sub 2]NiO[sub 4+δ] Thin Films Grown by Chemical Vapor Deposition

García, G.; Burriel, Mónica; Bonanos, Nikolaos; Santiso, J.

doi:10.1149/1.2829900

Cited by 28 publications

(40 citation statements)

References 43 publications

(68 reference statements)

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“…Prior to each exchange, a pre-annealing step was performed, which consisted in equilibrating the sample at the temperature of interest (same temperature as the subsequent exchange) in dry natural 16 O oxygen (99.9% purity with natural abundances for (all) the oxygen isotopes) at 200 mbar. The time used for the pre-anneal step in natural oxygen was always much longer (at least five times) than the exchange time.…”

Section: Oxygen Isotopic Exchangementioning

confidence: 99%

Influence of Crystal Orientation and Annealing on the Oxygen Diffusion and Surface Exchange of La₂NiO_4+δ

et al. 2016

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La2NiO4+δ is a mixed ionic-electronic conducting material with the 2D K2NiF4-type structure and with a large interest as a potential intermediate temperature solid oxide fuel cell (IT-SOFC) cathode. The oxygen diffusion along the ab plane exhibiting the highest oxygen ionic conductivity governs the behaviour of the bulk materials in this family of oxides. The oxygen surface exchange processes, however, are not well understood and large differences in surface exchange coefficient (k *) values can be found in the literature for this and other cathode materials. The Isotopic Exchange Depth Profiling (IEDP) technique was used in combination with Low Energy Ion Scattering (LEIS) measurements on two sets of La2NiO4+δ single crystals with precisely cut crystal faces but different thermal history. For each set of single crystals the oxygen diffusion and surface exchange coefficient were evaluated for 2 different orientations in the temperature range of 450-600 ºC. The differences in k * have been correlated with differences in surface chemistry: surface termination, near-surface rearrangement and presence of extrinsic impurities. Finally, the predominant La-termination at the immediate outer surface is evidenced, confirming recent results in other of Ruddlesden-Popper (RP) phases with mixed ionic-electronic conducting properties.

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Section: Oxygen Isotopic Exchangementioning

confidence: 99%

Influence of Crystal Orientation and Annealing on the Oxygen Diffusion and Surface Exchange of La₂NiO_4+δ

et al. 2016

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“…The ASR of the LN cathode is as large as 27.5 Ω cm 2 at 600°C, ∼180 times larger than that of BSCF cathode (Supplementary information, Figs S1 and S3). However, the high electrical conductivity of LN thin film (∼300 S cm −1 )21 makes it suitable for surface coating on BSCF considering the low electrical conductivity of BSCF (∼40 S cm −1 )22.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical CO2-protective shell for highly efficient oxygen reduction reaction

Zhou

Liang

Shao

et al. 2012

Sci Rep

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The widespread application of intermediate-temperature solid oxide fuel cells is mainly being hurdled by the cathode's low efficiency on oxygen reduction reaction and poor resistance to carbon dioxide impurity. Here we report the fabrication of a hierarchical shell-covered porous cathode through infiltration followed by microwave plasma treatment. The hierarchical shell consists of a dense thin-film substrate with cones on the top of the substrate, leading to a three-dimensional (3D) heterostructured electrode. The shell allows the cathode working stably in CO2-containing air, and significantly improving the cathode's oxygen reduction reactivity with an area specific resistance of ∼0.13 Ωcm2 at 575°C. The method is also suitable for fabricating functional shell on the irregularly shaped substrate in various applications.

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“…Recently, many investigation on A2BO4 (A=La, Pr and Nd, B=Co, Fe and Ni) oxides with the K2NiF4-type structure were reported as a promising candidate of cathode materials for IT-SOFCs [ [124][125][126][127][128][129][130][131][132]. The ideal K2NiF4-type structure can be regarded as a combination of the ABO3 perovskite and Ln2O2 rock-salt layers stacked one upon the other along the c-axis as shown in Fig.…”

Section: Layered-perovskite Oxidesmentioning

confidence: 99%

Developing high performance and stable hetero-structured cathodes and fundamental understanding of oxygen reduction and reaction behavior

Zhang¹

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Developing High Performance and Stable Hetero-structured Cathodes and Fundamental Understanding of Oxygen Reduction and Reaction Behavior ByXinxin Zhang New hetero-structured La2NiO4+δ (LNO)/ (La0.6Sr0.4)0.95Co0.2Fe0.8O3-δ (LSCF) SOFC cathodes have been successfully fabricated by the infiltration technique for long-term stability and oxygen reduction reaction (ORR) kinetic consideration. The current comparative study of LSCF and LNO-infiltrated LSCF shows a significant reduction in polarization resistance by one order of magnitude and a 67% increase in maximum power density by using LNO-infiltrated LSCF cathodes at 750 o C in air. The electronic conductivity relaxation (ECR) results demonstrate that the remarkable improved oxygen exchange properties of LNO/LSCF hetero-structured cathodes are attributed to not only the increase of surface reaction area, but also the introduction of LNO surface and LNO-LSCF interface with rapid oxygen exchange behavior. A trace amount of Co, Sr and more oxygen defects stabilized in the LNO layer have been identified by TEM, EDXS, XPS, XRD and iodine titration experiments, giving rise to the enhancement of stability and surface catalytic activity. A low degradation rate of 0.39% at a constant current density of 250 mA•cm-2 can be still achieved for the fuel cell using LNO-infiltrated LSCF cathodes after long-term durability of about 500 h at 750 o C, accompanied by nanoparticles growth/aggregation, delamination and slight lanthanum enrichment on LNO surfaces. The benefits from the presence of the LNO nanoparticles demonstrate that LNO-infiltrated LSCF materials can act as high active surface oxygen exchange cathodes with promising fast ORR behavior and stability. To further enhance the long-term stability of infiltrated (La0.6Sr0.4)0.95Co0.2Fe0.8O3-δ (LSCF) cathode, two kinds of new hetero-structured cathodes, CeO2 & LNO co-infiltrated LSCF and La2-xNiO4+δ-infiltrated LSCF, have been designed. La2NiO4+δ (LNO), as an superior performance promoter, and CeO2, as a particle growth retardant due to the high melting point and good wettability, were co-infiltrated into the LSCF backbone to mitigate the delamination and growth/aggregation of in-situ formed nano-sized infiltrants. A more advantageous microstructure was confirmed in the co-infiltrated sample relative to those infiltrated with LNO alone. The original morphology was largely retained in the coinfiltrated sample after heat treatment, showing finer surface particles, better connection between the infiltrant network and the LSCF backbone. XPS and EIS results reveal that the substitution of stoichiometric La2NiO4+δ by A-site deficient La2-xNiO4+δ can effectively suppress lanthanum enrichment and enhance the stability after cathodic polarization treatment observed by measurement. The advantages of both modified hetero-structured cathodes suggest that CeO2 & La2-xNiO4+δ co-infiltrated LSCF is a promising heterostructured cathode to mitigate the LSCF electrode degradation. iv ACKNOWLEDGMENTS My deepest gratitude goes first and foremost...

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Electrical Conductivity and Oxygen Exchange Kinetics of La[sub 2]NiO[sub 4+δ] Thin Films Grown by Chemical Vapor Deposition

Cited by 28 publications

References 43 publications

Influence of Crystal Orientation and Annealing on the Oxygen Diffusion and Surface Exchange of La₂NiO_4+δ

Influence of Crystal Orientation and Annealing on the Oxygen Diffusion and Surface Exchange of La₂NiO_4+δ

Hierarchical CO2-protective shell for highly efficient oxygen reduction reaction

Developing high performance and stable hetero-structured cathodes and fundamental understanding of oxygen reduction and reaction behavior

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Electrical Conductivity and Oxygen Exchange Kinetics of La[sub 2]NiO[sub 4+δ] Thin Films Grown by Chemical Vapor Deposition

Cited by 28 publications

References 43 publications

Influence of Crystal Orientation and Annealing on the Oxygen Diffusion and Surface Exchange of La2NiO4+δ

Influence of Crystal Orientation and Annealing on the Oxygen Diffusion and Surface Exchange of La2NiO4+δ

Hierarchical CO2-protective shell for highly efficient oxygen reduction reaction

Developing high performance and stable hetero-structured cathodes and fundamental understanding of oxygen reduction and reaction behavior

Contact Info

Product

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Influence of Crystal Orientation and Annealing on the Oxygen Diffusion and Surface Exchange of La₂NiO_4+δ

Influence of Crystal Orientation and Annealing on the Oxygen Diffusion and Surface Exchange of La₂NiO_4+δ