Electrochemical Reduction of Oxygen and Nitric Oxide at Low Temperature on La1−x Sr x FeO3−δ Cathodes

Hansen, K. Kammer

doi:10.1007/s12678-014-0192-3

Cited by 10 publications

(7 citation statements)

References 37 publications

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“…These two regions disclosed the different activation energies of the conduction process as given in Table 2. The higher activation energy at lower than 400 °C temperatures could be understood by higher concentration of ionic defects instead of electronic as represented by reaction (2) compared to reaction (1). The activation energies of undoped and phase pure Ag-doped lanthanum ferrites or manganites are almost same, what brings a conclusion that the materials are of the same nature and the conduction mechanism is the same.…”

Section: Discussionmentioning

confidence: 95%

“…The obtained results and the mechanisms can be explained by the defect equilibria in the following way. It is suggested that the defect equilibria of the Ag exsolution explaining the increased conductivity of the materials could be described as follows in the reactions (1) and (2).…”

Section: Discussionmentioning

confidence: 99%

“…Referring to these defect equilibria, either transition metal ions on the B-site of the La(III)M(III)O 3 perovskite are involved in the Ag exsolution process and oxidized as in reaction (1) or not as in reaction Eq.…”

Section: Discussionmentioning

confidence: 99%

“…Lanthanum-based perovskite oxides, La(III)M(III)O 3 , are state-of-the-art materials for electrodes in solid state electrochemical devices and have received much attention due to their outstanding properties, such as high electrical conductivity, fast surface oxygen exchange, easy oxygen ion diffusion and thermal stability [1,2]. The modified perovskite oxides with metal nanoparticles on the surface have been widely studied as catalytic materials in few chemical and electrochemical processes, such as solid oxide fuel cells (SOFCs) [3,4], electrolyzers (SOECs) [5], and automotive emission control [2,6,7].…”

Section: Introduction mentioning

confidence: 99%

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Silver Exsolution-Enhanced Electrical Properties of Lanthanum-Based Perovskites

Sažinas¹

2019

JMSE-A

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The effect of silver (Ag) exsolution on the electrical conductivity of strontium-doped lanthanum manganite (La 1-x-y Sr x Ag y MnO 3-δ , LSAM) and ferrite (La 1-x-y Sr x Ag y FeO 3-δ , LSAF) perovskites was investigated. The single-phase Ag-doped materials formed at 800 °C using modified Pechini method and revealed thermal stability in oxidizing atmosphere up to sintering temperature of the materials at 1,200 °C. The exsolution of the metallic Ag nanoparticles was performed at 420-500 °C in reducing atmosphere of 5% H 2 /N 2. Scanning electron microcopy results exhibited the metallic Ag phase nanoparticles on the surface of the oxide backbone with a good contact of Ag to the surface of the perovskite after exsolution. The electrical conductivity of the materials was investigated in the temperature range of 50-900 °C in air and isothermally in 5% H 2 /N 2 at 420 and 500 °C by means of four probe DC measurement method, and reached 80-230 S•cm-1 for undoped and Ag-doped LSF and LSM. The electrical conductivity results showed improving conductivity in Ag-doped single-phase and Ag nanoparticle decorated perovskites after Ag exsolution. The results revealed the dependence of electrical conductivity on the atmosphere, temperature and Ag exsolution time.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

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Silver Exsolution-Enhanced Electrical Properties of Lanthanum-Based Perovskites

Sažinas¹

2019

JMSE-A

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“…4 One type of perovskite material is La 1¹x Sr x FeO 3¹d (LSFxx). LSF has been studied using point electrodes for the reduction of nitrous oxide, 8 nitric oxide 9 and nitrogen dioxide. 10 The ferrites have shown the ability to reduce all three types of nitrogen oxides electrochemically.…”

Section: Introductionmentioning

confidence: 99%

Activation/Deactivation Phenomena’s in the Electrochemical Reduction of O2 and NO on La1−xSrxFeO3−δ

HANSEN

2020

Electrochemistry

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Three ferrite based perovskites were investigated as cathodes for the electrochemical reduction of oxygen and nitric oxide, using coneshaped electrodes and cyclic voltammetry. The ferrites investigated were LaFeO 3 , La 0.85 Sr 0.15 FeO 3−δ and La 0.5 Sr 0.5 FeO 3−δ. Especially the effect of anodic pre-treatment of the electrodes was investigated. It was shown that the ferrite based electrodes are better at reducing nitric oxide than oxygen in the temperature range 200 to 400°C. The ability of the ferrites to reduce oxygen depends mainly on the amount of Fe(III) and oxide anion vacancies, leading to the highest activity towards the reduction of oxygen for the intermediate compound La 0.85 Sr 0.15 FeO 3−δ in the investigated temperature range. All the electrodes were either activated or deactivated when polarized at 0.4 vs. air, before recording the voltammograms, depending on temperature and gas atmosphere. This was attributed to annihilation of oxide ion vacancies, strontium segregation to the surface of the electrodes and perhaps formation of Fe(IV). The effect of water vapor was also studied. It had a slightly deactivating effect on the activity in the nitric oxide containing atmosphere, the effect being highest at the lowest temperatures.

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Electrochemical reduction of NO with propene in the presence of oxygen on LSCoM/CGO porous cell stacks impregnated with BaO

Friedberg

2015

J Solid State Electrochem

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Electrochemical Reduction of Oxygen and Nitric Oxide at Low Temperature on La1−x Sr x FeO3−δ Cathodes

Cited by 10 publications

References 37 publications

Silver Exsolution-Enhanced Electrical Properties of Lanthanum-Based Perovskites

Silver Exsolution-Enhanced Electrical Properties of Lanthanum-Based Perovskites

Activation/Deactivation Phenomena’s in the Electrochemical Reduction of O<sub>2</sub> and NO on La<sub>1−</sub><i><sub>x</sub></i>Sr<i><sub>x</sub></i>FeO<sub>3−δ</sub>

Electrochemical reduction of NO with propene in the presence of oxygen on LSCoM/CGO porous cell stacks impregnated with BaO

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