An EIS study of La2 − x Sr x NiO4 +  δ SOFC cathodes

Kammer, K.

doi:10.1007/s11581-009-0331-7

Cited by 26 publications

(14 citation statements)

References 18 publications

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“…Among the investigated electrodes, the electrode sintered at 1,050°C exhibited the lowest R p of 0.42 Ωcm 2 at 800°C, which is competitive to the results (1.00 and 1.78 Ωcm 2 ) obtained at the same temperature for La 2 NiO 4+δ electrodes printed on Ce 0.8 Sm 0.2 O 1.9 and YSZ electrolytes, respectively [9,10]. Moreover, this value is fairly near to that (0.41 Ωcm 2 ) measured at 800°C for the electrode printed on 2 mol%-Co-doped Ce 0.8 Sm 0.2 O 1.9 support [9].…”

Section: Methodscontrasting

confidence: 49%

“…Therefore, electrocatalytic activity towards oxygen reduction is an important criterion to gauge the application potential of a cathode material in SOFC devices. The electrochemical properties of Ln 2 NiO 4+δ -based mixed conductors have been extensively inspected in view of the application as the cathode of IT-SOFCs [6][7][8][9][10]. Moreover, the oxygen reduction reaction on the surfaces of Ln 2 NiO 4 +δ -based cathodes has been investigated by the electrochemical impedance spectroscopy technique under various dc bias conditions and/or oxygen partial pressures [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and electrochemical properties of porous La2NiO4+δ electrodes spin-coated on Ce0.8Sm0.2O1.9 electrolyte

Zhao

Huang

et al. 2011

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Porous La 2 NiO 4+δ electrodes were prepared from superfine starting powder on dense substrates of Ce 0.8 Sm 0.2 O 1.9 electrolyte by a spin coating technique. The microstructure and electrochemical properties of the electrodes were investigated within the sintering temperature range of 1,000-1,100°C. An obvious effect of sintering temperature on the microstructure and electrochemical properties was detected. The variation of the electrochemical properties with sintering temperature was explained in relation to the microstructural evolution of the porous electrodes. It was detected that the electrode processes greatly depended on the microstructure of the electrodes. The polarization of surface oxygen exchange process was found to be the major contribution to the total electrode polarization. The electrode sintered at 1,050°C showed the optimum electrocatalytic activity among the investigated electrodes. At 800°C, the electrode exhibited a polarization resistance of 0.42 Ωcm 2 , an overpotential of 48 mV at a current density of 200 mA cm −2 and an exchange current density of 121 mA cm −2 .

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Section: Methodscontrasting

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Microstructure and electrochemical properties of porous La2NiO4+δ electrodes spin-coated on Ce0.8Sm0.2O1.9 electrolyte

Zhao

Huang

et al. 2011

Ionics

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“…Therefore, electrocatalytic activity towards oxygen reduction is an important criterion to evaluate the application potential of a cathode in SOFC devices. The electrochemical properties of Ln 2 NiO 4+δ -based mixed conductors have been extensively inspected in view of the application of IT-SOFCs as the cathode [6][7][8][9][10]. The kinetics of oxygen reduction reaction on the surface of Ln 2 NiO 4+δ -based cathodes has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical evaluation of La2NiO4+δ -based composite electrodes screen-printed on Ce0.8Sm0.2O1.9 electrolyte

Zhao

Huang

et al. 2012

J Solid State Electrochem

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La 2 NiO 4+δ , 60 wt.% La 2 NiO 4+δ -40 wt.% La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ , and 60 wt.% La 2 NiO 4+δ -40 wt.% Ce 0.8 Sm 0.2 O 1.9 electrodes were prepared from fine powders on dense Ce 0.8 Sm 0.2 O 1.9 electrolyte substrates by screenprinting technique. Electrochemical impedance spectroscopy and chronopotentiometry techniques were employed to evaluate the electrochemical properties of the composite electrodes in comparison with the La 2 NiO 4+δ electrode. For the three electrodes, main electrode processes were resolved to be charge-transfer at the electrode/electrolyte interface and oxygen exchange on the electrode surface. The contribution of the surface oxygen exchange process was detected to be dominant for the overall electrode polarization. The addition of Ce 0.8 Sm 0.2 O 1.9 into La 2 NiO 4+δ was favorable for the charge transfer process whereas it was undesired for the surface oxygen exchange process. On comparison, adding La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ into La 2 NiO 4+δ was found to benefit both the two electrode processes. The La 2 NiO 4+δ -La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ composite electrode showed optimum electrochemical properties among the three electrodes. At 800°C, the composite electrode achieved a polarization resistance of 0.20 Ω cm 2 , an overpotential of 45 mV at a current density of 200 mA cm −2 , together with an exchange current density of ∼200 mA cm −2 .

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“…Aguadero et al 24 showed that the interfacial resistance of La 1.9 Sr 0.1 NiO 4+δ is slightly larger than that for LNO. Kammer et al 25 found La 1.9 Sr 0.1 NiO 4+δ displays much better performance than LNO and the peak appears at x = 0.25 in the La 2-x Sr x NiO 4+δ (0 ≤ x ≤ 0.35) series. Lee et al 26 reported that the ORR performance of LNO decreases monotonically with Sr doping.…”

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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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An EIS study of La2 − x Sr x NiO4 + δ SOFC cathodes

Cited by 26 publications

References 18 publications

Microstructure and electrochemical properties of porous La2NiO4+δ electrodes spin-coated on Ce0.8Sm0.2O1.9 electrolyte

Microstructure and electrochemical properties of porous La2NiO4+δ electrodes spin-coated on Ce0.8Sm0.2O1.9 electrolyte

Electrochemical evaluation of La2NiO4+δ -based composite electrodes screen-printed on Ce0.8Sm0.2O1.9 electrolyte

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

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An EIS study of La2 − x Sr x NiO4 + δ SOFC cathodes

Cited by 26 publications

References 18 publications

Microstructure and electrochemical properties of porous La2NiO4+δ electrodes spin-coated on Ce0.8Sm0.2O1.9 electrolyte

Microstructure and electrochemical properties of porous La2NiO4+δ electrodes spin-coated on Ce0.8Sm0.2O1.9 electrolyte

Electrochemical evaluation of La2NiO4+δ -based composite electrodes screen-printed on Ce0.8Sm0.2O1.9 electrolyte

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