Transport properties and defect analysis of La1.9Sr0.1NiO4+δ

Li, Zuoan; Haugsrud, Reidar; Smith, Jens B.; Norby, Truls

doi:10.1016/j.ssi.2009.08.011

Cited by 25 publications

(31 citation statements)

References 26 publications

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“…2. The doping of lanthanum sites by copper leads to the formation of pure phases with a K 2 NiF 4 structure, in agreement with several studies [8][9][10][25][26][27][28]. It is likely that cupric ions replace lanthanum sites and create additional sites displacement, which improves the electrical conductivity.…”

Section: Methodssupporting

confidence: 88%

Novel La2-x Cu x NiO4±δ /La4Ni3O10-δ composite materials for intermediate temperature solid oxide fuel cells, IT-SOFC

Ferkhi

Ringuedé

Cassir

2015

J Solid State Electrochem

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Phases constituted by La 2-x Cu x NiO 4±δ (0.01≤x≤ 0.1) of the Ruddlesden-Popper family (La n+1 Ni n O 3n+1 ; n=1) were prepared and then mixed with La 4 Ni 3 O 10 , in a weight ratio of 50:50 wt%, in order to be used as solid oxide fuel cell cathodes. ASR values relative to the symmetrical cells constituted by yttria-stabilized zirconia electrolyte and the following e l ec t r o d es , L a 1 . 9 8 C u 0 . 0 2 N i O 4 + δ + La 4 N i 3 O 1 0 an d La 1.95 Cu 0.05 NiO 4+δ + La 4 Ni 3 O 10 , are of 11.8 Ω cm 2 at 650°C for both and, respectively, of 3.5 and 2.9 Ω cm 2 at 750°C. In the case of the second cell, the electrode material reacts with the electrolyte forming an insulating phase at the interface, contrarily to the first cell, which stability could be explained by the combination of low doping amounts of copper and the presence of La 4 Ni 3 O 10 acting as a stabilizer of the material at high temperature.

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Section: Methodssupporting

confidence: 88%

Novel La2-x Cu x NiO4±δ /La4Ni3O10-δ composite materials for intermediate temperature solid oxide fuel cells, IT-SOFC

Ferkhi

Ringuedé

Cassir

2015

J Solid State Electrochem

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“…This is consistent with the finding that the values of 2DS become smaller for higher d (Fig. 7b and c) 19 The concentration of oxygen vacancies is considered negligible here. The following pseudo-chemical reaction shows the equilibrium between oxygen interstitials, electron holes, and the surrounding oxygen gas molecules.…”

Section: Shown Insupporting

confidence: 93%

“…As a first order approximation, the deviation is assumed to be a linear function of the oxygen non-stoichiometry, d. 16,19 DG ex = 2RTlnc 1 c 2 2 M ad…”

Section: Shown Inmentioning

confidence: 99%

Electrical properties, thermodynamic behavior, and defect analysis of Lan+1NinO3n+1+δ infiltrated into YSZ scaffolds as cathodes for intermediate-temperature SOFCs

et al. 2012

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“…As stated before, D (or δ) is reported to depend on P O2 by a factor around or less than 1/6. 23,40 Therefore, oxygen dependency from the surface exchange reaction part needs to be over 1/2 to yield the measured values of 1/3∼1/2. Step 2 O ads + e ↔ O − ads n = 3/8 [ 5 ] Step 3…”

Section: Resultsmentioning

confidence: 99%

Oxygen Reduction Reaction Kinetics in Sr-Doped La₂NiO_4+δRuddlesden-Popper Phase as Cathode for Solid Oxide Fuel Cells

Guan

Zhang

et al. 2015

J. Electrochem. Soc.

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In this paper, electro-catalytic reduction of oxygen in Sr-doped lanthanum nickelates, La 2-x Sr x NiO 4+δ (0 ≤ x ≤ 0.4) RuddlesdenPopper (R-P) phase, has been investigated. The oxygen reduction reaction (ORR) kinetics is evaluated via electrochemical impedance spectroscopy (EIS) with the symmetric cell configuration. The maximum performance is achieved with the un-doped La 2 NiO 4+δ , ∼0.13 cm 2 at 800 • C. Sr doping decreases the electrode performance progressively. Further detailed analysis indicates that bulk ionic diffusion and surface oxygen exchange co-limit the ORR of those cathodes. Sr substitution leads to both lowered bulk diffusion and surface exchange rates. With high Sr content (x = 0.3, 0.4), oxygen ion transfer resistance between nickelate/electrolyte is observed. As for the surface exchange process, oxygen adsorption is suggested to be the main rate-limiting step (RLS) according to the reaction orders, which is retarded further by the oxidation of Ni 2+ to Ni 3+ as Sr content increases. The possible role of incorporation process in determining the overall reaction rate is also discussed.Intermediate temperature (600∼800 • C) solid oxide fuel cells (ITSOFCs) have attracted increasing interest because of the relaxed requirement for sealing, interconnects and thermal expansion matching. However, the lowered operating temperature usually leads to poorer performance due to the increased electrolyte resistance and the retarded electrode reaction kinetics. In order to improve the cathode performance of IT-SOFCs, mixed ionic and electronic conductors (MIEC) have been brought up as potential electrode materials. The fast ionic conduction in MIEC could transport oxygen vacancies from electrolyte to 3-dimension of the cathode network, thereby enlarging the electrochemically reactive area. 1 Recently, K 2 NiF 4 type La 2 NiO 4+δ (LNO)-based oxides with higher oxygen ionic conductivity than conventional LaCoO 3 -based perovskites such as (LaSr)(CoFe)O 3-δ (LSCF), have also been proposed as possible candidates for IT-SOFCs cathode application. [2][3][4][5][6][7][8][9][10][11] The lattice structure of LNO is composed of perovskite alternating with LaO rock salt layers. Oxygen hyperstoichiometry is confirmed and associated to the incorporation of oxygen atoms into the interstitial sites of LaO layers. [12][13][14][15] The ionic conductivity of such materials mainly results from the in-plane transport of interstitial oxygen in the LaO layers. [16][17][18][19] La and/or Ni site element substitution have been used to tailor the materials in attempt to improving certain physical parameters, such as the surface exchange (k), bulk diffusion (D) coefficients and electrical conductivity. Despite excellent oxygen surface exchange and bulk diffusion properties, un-doped LNO did not show superior ORR performance, which is believed to relate to low electronic conductivity of such material. Sr substitution for La in LNO is confirmed to improve the electronic conductivity beneficially, 20 while the ionic conductivity is decre...

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Transport properties and defect analysis of La1.9Sr0.1NiO4+δ

Cited by 25 publications

References 26 publications

Novel La2-x Cu x NiO4±δ /La4Ni3O10-δ composite materials for intermediate temperature solid oxide fuel cells, IT-SOFC

Novel La2-x Cu x NiO4±δ /La4Ni3O10-δ composite materials for intermediate temperature solid oxide fuel cells, IT-SOFC

Electrical properties, thermodynamic behavior, and defect analysis of Lan+1NinO3n+1+δ infiltrated into YSZ scaffolds as cathodes for intermediate-temperature SOFCs

Oxygen Reduction Reaction Kinetics in Sr-Doped La₂NiO_4+δRuddlesden-Popper Phase as Cathode for Solid Oxide Fuel Cells

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Transport properties and defect analysis of La1.9Sr0.1NiO4+δ

Cited by 25 publications

References 26 publications

Novel La2-x Cu x NiO4±δ /La4Ni3O10-δ composite materials for intermediate temperature solid oxide fuel cells, IT-SOFC

Novel La2-x Cu x NiO4±δ /La4Ni3O10-δ composite materials for intermediate temperature solid oxide fuel cells, IT-SOFC

Electrical properties, thermodynamic behavior, and defect analysis of Lan+1NinO3n+1+δ infiltrated into YSZ scaffolds as cathodes for intermediate-temperature SOFCs

Oxygen Reduction Reaction Kinetics in Sr-Doped La2NiO4+δRuddlesden-Popper Phase as Cathode for Solid Oxide Fuel Cells

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Oxygen Reduction Reaction Kinetics in Sr-Doped La₂NiO_4+δRuddlesden-Popper Phase as Cathode for Solid Oxide Fuel Cells