Gd- and Pr-based double perovskite cobaltites as oxygen electrodes for proton ceramic fuel cells and electrolyser cells

Strandbakke, Ragnar; Черепанов, В.А.; Zuev, A. Yu.; Цветков, Д. С.; Argirusis, Christos; Sourkouni, Georgia; Prünte, Stephan; Norby, Truls

doi:10.1016/j.ssi.2015.05.014

Cited by 147 publications

(166 citation statements)

References 30 publications

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“…Layered double perovskite materials with the general formula LnBaM 2 O 5+δ (Ln = lanthanide or Y; M = transition metal) have been studied as potential electrodes for both PCFC [15,16,17,18] and SOFC due to their outstanding mixed electronic and oxide-ion conductivities [19,20]. Ln and Ba occupy the A-site in this double perovskite AA′B 2 O 6 -type crystal structure, while M occupies the B-site.…”

Section: Introductionmentioning

confidence: 99%

“…Strandbakke et al have reported outstanding performance for the layered double perovskite La 0.2 Gd 0.8 BaCo 2 O 5+δ [16] as a PCFC cathode with Area Specific Resistances (ASR) as low as 6 Ω·cm 2 at 400 °C and 3% H 2 O in air. The large oxygen vacancy concentration adopted by the layered double perovskite seems to favor proton incorporation and sufficient proton conductivity.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cation Ordering on the Performance and Chemical Stability of Layered Double Perovskite Cathodes

et al. 2018

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The effect of A-site cation ordering on the cathode performance and chemical stability of A-site cation ordered LaBaCo2O5+δ and disordered La0.5Ba0.5CoO3−δ materials are reported. Symmetric half-cells with a proton-conducting BaZr0.9Y0.1O3−δ electrolyte were prepared by ceramic processing, and good chemical compatibility of the materials was demonstrated. Both A-site ordered LaBaCo2O5+δ and A-site disordered La0.5Ba0.5CoO3−δ yield excellent cathode performance with Area Specific Resistances as low as 7.4 and 11.5 Ω·cm2 at 400 °C and 0.16 and 0.32 Ω·cm2 at 600 °C in 3% humidified synthetic air respectively. The oxygen vacancy concentration, electrical conductivity, basicity of cations and crystal structure were evaluated to rationalize the electrochemical performance of the two materials. The combination of high-basicity elements and high electrical conductivity as well as sufficient oxygen vacancy concentration explains the excellent performance of both LaBaCo2O5+δ and La0.5Ba0.5CoO3−δ materials at high temperatures. At lower temperatures, oxygen-deficiency in both materials is greatly reduced, leading to decreased performance despite the high basicity and electrical conductivity. A-site cation ordering leads to a higher oxygen vacancy concentration, which explains the better performance of LaBaCo2O5+δ. Finally, the more pronounced oxygen deficiency of the cation ordered polymorph and the lower chemical stability at reducing conditions were confirmed by coulometric titration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Cation Ordering on the Performance and Chemical Stability of Layered Double Perovskite Cathodes

et al. 2018

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“…Since the surface kinetics for the reactions preceding water formation in the tpb region is normally slow at low temperatures, they will potentially limit the overall rate of the PCFC cathode reaction. As there are still only a few mixed proton electron conducting (P-MIEC) oxides reported as PCFC cathode materials [2][3][4], a PCFC is therefore more vulnerable to slow kinetics and diffusion at the electrode surfaces than the oxide ion conducting SOFC. Figure 1 illustrates the reaction paths for an O-MIEC electrode on an oxide-ion conductor (a) and on a proton conductor (b), a P-MIEC electrode on a proton conductor (c), and a pure electronic conductor electrode on oxide ion (d) and proton conducting (e) electrolytes.…”

Section: Introductionmentioning

confidence: 99%

“…The characterization of the partial electrode resistances involves a novel way of modelling the deconvoluted EIS data, seeing the flow of protons and oxide ions as parallel charge carrier paths or "rails" [4]. By doing this, activation energies and pre-exponential values for components adding up to the total polarization resistance can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Reaction Kinetics of Protons and Oxide Ions in LSM/Lanthanum Tungstate Cathodes with Pt Nanoparticle Activation

Strandbakke

Dyrlie

Hage

et al. 2016

J. Electrochem. Soc.

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Composite electrodes of La 0.8 Sr 0.2 MnO 3 (LSM) / La 28-x W 4+x O 54+3x/2 (x=0.85, "LWO56") on LWO56 electrolytes have been characterized by use of electrochemical impedance spectroscopy vs pO 2 and temperature from 900 ⁰C, where LWO56 is mainly oxide ion conducting, to 450 ⁰C, where it is proton conducting in wet atmospheres. The impedance data are analyzed in a model which takes into account the simultaneous flow of oxide ions and protons across electrolyte and electrodes, allowing extraction of activation energies and pre-exponential factors for the partial electrode reactions of protons and oxide ions. One composite electrode was infiltrated with Pt nanoparticles with average diameter of 5 nm, lowering the overall electrode polarization resistance (R p ) at 650 ⁰C from 260 to 40 Ω cm 2 . The Pt-infiltrated electrode appears to be rate limited by surface reactions with activation energy of ~90 kJ mol -1 in the low temperature proton 2 transport regime and ~150 kJ mol -1 in the high temperature oxide ion transport regime. The charge transfer reaction, which makes a minor contribution to R p , exhibits activation energies of ~85 kJ mol -1 for both oxide ion and proton charge transfer.

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“…In order to implement this idea many efforts were undertaken since the first works of Iwahara to improve both ionic conductivity and chemical stability of these materials. The list of ceramic proton conductors with sufficient properties for commercial applications is limited, among them the ABO 3 [4,5] and ABO 4 [2,6,7] type materials or phosphate based materials [8,9] can be distinguished. In the case of the most promising group of compounds, namely ABO 3 perovskites, the proposed modifications approaches include:…”

Section: Introductionmentioning

confidence: 99%

Structure, chemical stability and electrical properties of BaCe 0.9 Y 0.1 O 3−δ proton conductors impregnated with Ba 3 (PO 4 ) 2

Łącz

Silarska

Piecha

et al. 2016

International Journal of Hydrogen Energy

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Gd- and Pr-based double perovskite cobaltites as oxygen electrodes for proton ceramic fuel cells and electrolyser cells

Cited by 147 publications

References 30 publications

Effect of Cation Ordering on the Performance and Chemical Stability of Layered Double Perovskite Cathodes

Effect of Cation Ordering on the Performance and Chemical Stability of Layered Double Perovskite Cathodes

Reaction Kinetics of Protons and Oxide Ions in LSM/Lanthanum Tungstate Cathodes with Pt Nanoparticle Activation

Structure, chemical stability and electrical properties of BaCe 0.9 Y 0.1 O 3−δ proton conductors impregnated with Ba 3 (PO 4 ) 2

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