LaCoO3: Promising cathode material for protonic ceramic fuel cells based on a BaCe0.2Zr0.7Y0.1O3−δ electrolyte

Ricote, Sandrine; Bonanos, Nikolaos; Lenrick, Filip; Wallenberg, L. Reine

doi:10.1016/j.jpowsour.2012.06.098

Cited by 66 publications

(40 citation statements)

References 31 publications

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“…The two other RQ elements (i.e., R SP_1 , CPE SP_1 , R SP_2 , CPE SP_2 , green and violet semicircles respectively for La 0.5 Ba 0.5 CoO 3−δ ) correspond to the electrode response of the cells. The assignment of these electrochemical processes was carried out by evaluating the pseudocapacitance of the RQ elements (Table S1 for both La 0.5 Ba 0.5 CoO 3−δ and LaBaCo 2 O 5+δ ) obtained with the electrochemical model: i.e., La 0.5 Ba 0.5 CoO 3−δ ; ~10 −10 F/cm 2 for the first RQ element, assigned as the response of the electrolyte [8,9,10,35,36,37,38,39,40,41]; ~10 −4 F/cm 2 and 10 −2 F/cm 2 for the other two RQ elements, assigned as the response of the electrode [8,9,10,35,36,37,38,39,40,41]. …”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

et al. 2018

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“…An additional advantage of using an electrolyte-electrode composite is the reduction of thermal expansion coefficient mismatch between the cathode and electrolyte. Several methods have previously been used to fabricate such composites, including direct mixing of the two phases as well as infiltration/impregnation-based techniques [22][23][24]. Conventional mixing approaches generally produce coarse composites with low activity; infiltration onto a porous backbone enables the production of finely nano-structured composites, but the process is time-consuming and achieving high second-phase loading can be challenging [10].…”

Section: Introductionmentioning

confidence: 99%

High-Performance La0.5Ba0.5Co1/3Mn1/3Fe1/3O3−δ-BaZr1−zYzO3−δ Cathode Composites via an Exsolution Mechanism for Protonic Ceramic Fuel Cells

et al. 2018

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A novel exsolution process was used to fabricate complex all-oxide nanocomposite cathodes for Protonic Ceramic Fuel Cells (PCFCs).The nanocomposite cathodes with La 0.5 Ba 0.−δ nominal composition were prepared from a single-phase precursor via an oxidation-driven exsolution mechanism. The exsolution process results in a highly nanostructured and intimately interconnected percolating network of the two final phases, one proton conducting (BaZr 1−z Y z O 3−δ ) and one mixed oxygen ion and electron conducting (La 0.5 Ba 0.5 Co 1/3 Mn 1/3 Fe 1/3 O 3−δ ), yielding excellent cathode performance. The cathode powder is synthesized as a single-phase cubic precursor by a modified Pechini route followed by annealing at 700 • C in N 2 . The precursor phase is exsolved into two cubic perovskite phases by further heat treatment in air. The phase composition and chemical composition of the two phases were confirmed by Rietveld refinement. The electrical conductivity of the composites was measured and the electrochemical performance was determined by impedance spectroscopy of symmetrical cells using BaZr 0.9 Y 0.1 O 2.95 as electrolyte. Our results establish the potential of this exsolution method where a large number of different cations can be used to design composite cathodes. The La 0.5 Ba 0.5 Co 1/3 Mn 1/3 Fe 1/3 O 3−δ -BaZr 0.9 Y 0.1 O 2.95 composite cathode shows the best performance of 0.44 Ω·cm 2 at 600 • C in 3% moist synthetic air.

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“…It has been reported that the protonic ceramic fuel cells (PCFC) involve the polarization losses related to cathode reaction, electrode/ electrolyte interfacial ion transfer and electrolyte conductivity and the corresponding impedance spectrum can be accounted in terms of an equivalent circuit model made of a series of three (RQ) components, R 0 (R 1 Q 1 )(R 2 Q 2 )(R 3 Q 3 ). [12][13][14][15][16][17] Here, R is a resistance and Q is a constant phase element which is related to a capacitance C by the following equation.…”

Section: ¹1mentioning

confidence: 99%

Electrochemical Analysis of Hydrogen Membrane Fuel Cells with Amorphous Zirconium Phosphate Thin Film Electrolyte

et al. 2014

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An electrochemical analysis was conducted with respect to a hydrogen membrane fuel cell (HMFC) comprising proton-conducting, amorphous zirconium phosphate, a-ZrP 2.5 O 8.9 H 1.3 , thin film electrolyte supported on a dense Pd anode. The HMFC gave rise to an OCV of 1.0 V, but the maximum power density was limited and was about 1 mW cm −2 at 400°C. The impedance spectroscopy revealed that the interfacial polarizations were decreased by two orders of magnitude when the cell configuration was changed from the fuel cell setup to the hydrogen concentration cell with an anode symmetric configuration. These results indicated that the polarization losses at the solid-solid anode interface are not a main contribution to the voltage loss of the HMFC. The large cathode polarization might be attributed to the lessened conductivity of amorphous zirconium phosphate electrolyte thin film formed on a precious metal electrode.

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LaCoO3: Promising cathode material for protonic ceramic fuel cells based on a BaCe0.2Zr0.7Y0.1O3−δ electrolyte

Cited by 66 publications

References 31 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

High-Performance La0.5Ba0.5Co1/3Mn1/3Fe1/3O3−δ-BaZr1−zYzO3−δ Cathode Composites via an Exsolution Mechanism for Protonic Ceramic Fuel Cells

Electrochemical Analysis of Hydrogen Membrane Fuel Cells with Amorphous Zirconium Phosphate Thin Film Electrolyte

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