The impedance of thin dense oxide cathodes

Boukamp, Bernard A.; Hildenbrand, Nicolas; Nammensma, P.; Blank, Dave H.A.

doi:10.1016/j.ssi.2010.05.037

Cited by 18 publications

(19 citation statements)

References 13 publications

(12 reference statements)

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“…The electrical conductivities of these materials lie in the range of about 4-1000 S cm -1 at 750°C in air (45)(46)(47)(48) and therefore reach comparably high values. Possible sheet resistance effects have been discussed for linear patterned electrodes of La 0.8 Sr 0.2 MnO 3±δ (19) and continuous electrode layers of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (39), but no evidence was found so far of sheet resistance having any influence on electrochemical impedance spectroscopy (EIS) measurements on circular thin film microelectrodes. However, the situation changes when investigating electrode materials with a rather low electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Sheet Resistance in Thin Film Solid Oxide Fuel Cell Model Cathodes: A Case Study on Circular Bi_1-xSr_xFeO_3-δ Microelectrodes

et al. 2012

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The potential solid oxide fuel cell cathode material Bi1-xSrxFeO3-δ exhibits low electrical conductivities (1-12 S cm-1 at 750°C) and is therefore especially susceptible for significant sheet resistance effects when investigated in thin film form. Impedance spectra of circular thin film microelectrodes of Bi1-xSrxFeO3-δ (x = 0.2, 0.5 and 0.8) show remarkable features such as an increase in apparent ohmic resistance (high-frequency intercept) and the appearance of a semicircle at intermediate frequencies, due unlikely to an interfacial resistance contribution. To understand the origin of these features, a 2D empirical numerical model developed by Lynch et al. to account for sheet resistance in thin electrode films was applied to simulate the experimental spectra. All spectral features were reproduced qualitatively and, in most cases, nearly quantitatively indicating high sheet resistance to be the reason for the observed peculiarities. In the presence of a lateral electrical potential gradient, the apparent chemical capacitance strongly underestimates the real material properties, whereas the electrode surface resistance remains largely unaffected.

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Section: Introductionmentioning

confidence: 99%

Sheet Resistance in Thin Film Solid Oxide Fuel Cell Model Cathodes: A Case Study on Circular Bi_1-xSr_xFeO_3-δ Microelectrodes

et al. 2012

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“…Obtained resistances of NN and LN coatings are in the same order of magnitude than a dense LSCF coating analyzed by B. A. Boukamp et al [43], in spite of better surface exchange and oxygen diffusion coefficients as shown in Table 1 [43].…”

Section: Electrochemical Analyses (Electrochemical Impedance Spectrosmentioning

confidence: 59%

“…The capacitance of the medium frequency contribution (MF) it was found to be larger, C eq z 10 À3 10 À1 F cm À2 . The source of this contribution is more complicated to be identified., It has been assigned to be due to the Oxygen Reduction Reaction (ORR) occurring at the electrode/gas interface in literature [20,43] or ionic transfers at the electrode/electrolyte interface [5]. The medium frequency phenomenon occurs at 1 kHz for LN and NN layers while it happens at 100 Hz for PN sample.…”

Section: K Aementioning

confidence: 99%

Ln 2 NiO 4+δ (Ln = La, Pr, Nd) coatings deposited by reactive magnetron sputtering as cathode material for intermediate temperature solid oxide fuel cell

Fondard

Billard

Bertrand

et al. 2018

Vacuum

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ARTICLE INFO ABSTRACT Keywords:Rar-arth nickelates Reactive magnetron sputtering lntermediate-temperature solid oxide fuel cell (IT-SOFC)This work focuses on the comparison of ln Ni O coatings (ln= La, Nd, Pr) deposited by reactive rnagnetron sputtering using Plasma Emission Monitoring (PEM) which allows high deposition rate. Each layer is deposited by different steps. The optimal regulation setpoint for oxide rare earth deposition is determined and then the current dissipated on the nickel target is adjusted to obtain the convenient Ln/ Ni ratio and to achieve the K 2 NiF 4 structure. After an appropriate annealing treatrnent, ail coatings exhibit crystalline structures, which depend on the Ln/Ni ratio. Due to the instability of Pr 2 Ni0 4 structure at intermediate temperatures, the crystallization step of praseodymium nickelate is performed at higher temperature than the other rnaterials. This further thermal treatrnent implies a more porous structure. Each coating exhibits interesting properties. Electrical and electrochemical characterizations performed on these deposits prove better properties of the praseodymium nickelate coating. Elaboration Electrochemical properties• Corresponding author. FEMTO-ST lnstitute (

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“…ref. [27]), or the use of a thick electrolyte pellet with a reference positioned at half height around the cylinder wall [28], which adds a large electrolyte impedance to the electrode dispersion, making it more difficult to obtain reliable data. By keeping the signal voltage low, e.g.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Effective improvement of interface modified strontium titanate based solid oxide fuel cell anodes by infiltration with nano-sized palladium and gadolinium-doped cerium oxide

Hussain

Høgh

Zhang

et al. 2013

Electrochimica Acta

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The development of low temperature solid oxide fuel cell (SOFC) anodes by infiltration of Pd/Gd-doped cerium oxide (CGO) electrocatalysts in Nb-doped SrTiO 3 (STN) backbones has been investigated. Modification of the electrode/electrolyte interface by thin layer of spin-coated CGO (400-500 nm) contributed to a significant improvement in performance of the STN backbones and infiltrated electrodes. The improvement is due to the result of CGO enrichment at the interface. The impedance analysis showed that addition of Pd further increased the electrode reaction rate with a factor 10 with respect to the CGO electrocatalysts. Very low electrode polarization resistances of 0.055 cm 2 (after excluding the gas diffusion limitation contribution) and 1.2 cm 2 at 600 • C and 400 • C, respectively, have been obtained in 3% H 2 /H 2 O. A gradual decrease in polarization resistance was achieved with increasing loading of Pd-CGO electrocatalyst. The microstructural analysis of the infiltrated Pd-CGO electrocatalyst on STN revealed a homogenous coating of Pd and CGO nanoparticles.

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The impedance of thin dense oxide cathodes

Cited by 18 publications

References 13 publications

Sheet Resistance in Thin Film Solid Oxide Fuel Cell Model Cathodes: A Case Study on Circular Bi_1-xSr_xFeO_3-δ Microelectrodes

Sheet Resistance in Thin Film Solid Oxide Fuel Cell Model Cathodes: A Case Study on Circular Bi_1-xSr_xFeO_3-δ Microelectrodes

Ln 2 NiO 4+δ (Ln = La, Pr, Nd) coatings deposited by reactive magnetron sputtering as cathode material for intermediate temperature solid oxide fuel cell

Effective improvement of interface modified strontium titanate based solid oxide fuel cell anodes by infiltration with nano-sized palladium and gadolinium-doped cerium oxide

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The impedance of thin dense oxide cathodes

Cited by 18 publications

References 13 publications

Sheet Resistance in Thin Film Solid Oxide Fuel Cell Model Cathodes: A Case Study on Circular Bi1-xSrxFeO3-δ Microelectrodes

Sheet Resistance in Thin Film Solid Oxide Fuel Cell Model Cathodes: A Case Study on Circular Bi1-xSrxFeO3-δ Microelectrodes

Ln 2 NiO 4+δ (Ln = La, Pr, Nd) coatings deposited by reactive magnetron sputtering as cathode material for intermediate temperature solid oxide fuel cell

Effective improvement of interface modified strontium titanate based solid oxide fuel cell anodes by infiltration with nano-sized palladium and gadolinium-doped cerium oxide

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Sheet Resistance in Thin Film Solid Oxide Fuel Cell Model Cathodes: A Case Study on Circular Bi_1-xSr_xFeO_3-δ Microelectrodes

Sheet Resistance in Thin Film Solid Oxide Fuel Cell Model Cathodes: A Case Study on Circular Bi_1-xSr_xFeO_3-δ Microelectrodes