Oxygen reduction at the Ag|Gd0.2Ce0.8O1.9 interface studied by electrochemical impedance spectroscopy and cyclic voltammetry at the silver point electrode

Mosiałek, Michał; Nowak, Paweł; Dudek, Magdalena; Mordarski, G.

doi:10.1016/j.electacta.2013.12.071

Cited by 23 publications

(18 citation statements)

References 53 publications

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“…5). Similar capacitive features were observed in our earlier work [22] and ascribed to the presence of diffusional impedance in the measured system. Such explanation is very probable in the present case too, because at such low oxygen concentration one can expect diffusion limitation.…”

Section: Cyclic Voltammetrysupporting

confidence: 81%

Composite cathode materials Sm0.5Sr0.5CoO3–La0.6Sr0.4FeO3 for solid oxide fuel cells

et al. 2015

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Section: Cyclic Voltammetrysupporting

confidence: 81%

Composite cathode materials Sm0.5Sr0.5CoO3–La0.6Sr0.4FeO3 for solid oxide fuel cells

et al. 2015

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“…Silver electrodes reveal high polarization resistances reported on both quasi-point [18] and porous electrodes [19]. Composite cathodes with silver and ionic conductor material are characterized by good performance [17,[20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…These measurements have been performed using point electrodes [5,6,15,18,[52][53][54], porous electrodes in a symmetrical cell [55][56][57][58][59], or three-electrode setup [60][61][62].…”

Section: Introductionmentioning

confidence: 99%

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

Mosiałek

Dudek

Michna

et al. 2014

J Solid State Electrochem

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Silver-Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) cathodes were prepared in two ways. In the first method, Ag-BSCF composite powder was prepared in ethanol solution, where Ag nanoparticles serving as a component in the preparation of Ag-BSCF composite cathodes had been previously obtained via one-step synthesis in absolute ethanol using a neutral polymer (polyvinylpyrrolidone). To the best of our knowledge, this is the first study to use a Ag sol obtained by the above method for preparation of Ag-BSCF composite powder. Then, a paste containing this powder was screen-printed on a Sm 0.2 Ce 0.8 O 1.9 electrolyte and sintered at 1,000°C. In the second technique, an aqueous solution of AgNO 3 was added to a previously sintered BSCF cathode, which was then sintered again at 800°C. The oxygen reduction reaction at the quasi-point BSCF cathode on the Sm 0.2 Ce 0.8 O 1.9 electrolyte was tested by electrochemical impedance spectroscopy at different oxygen concentrations in three electrode setup. The continuous decrease of polarization resistance was observed under polarization −0.5 V at 600°C. The comparative studies of both obtained composite Ag-BSCF materials were performed in hydrogen-oxygen IT-SOFC involving samariadoped ceria as an electrolyte and Ni-Gd 0.2 Ce 0.8 O 1.9 anode. In both cases, the addition of silver to the cathode caused an increase in current and power density compared with an IT-SOFC built with the same components but involving a monophase BSFC cathode material.

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“…For the analysis of the impedance data, the Minuit [25] program, based on a complex nonlinear regression least-square procedure, was used to fit the equation describing the assumed equivalent electrical circuit (EEC) to the measured data. More detailed description of the data-treatment procedure may be found in our previous publication [26].…”

Section: Methodsmentioning

confidence: 99%

Thermal shock resistant composite cathode material Sm0.5Sr0.5CoO3–δ–La0.6Sr0.4FeO3–δ for solid oxide fuel cells

Tatko

Mosiałek

Kędra

et al. 2015

J Solid State Electrochem

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The Sm 0.5 Sr 0.5 CoO 3-δ -La 0.6 Sr 0.4 FeO 3-δ 1:1 composite, obtained by sintering mixture of components, was tested as a prospective cathode material for the oxygen reduction reaction in solid oxide fuel cells. Catalytic activity of the prepared material was characterized using electrochemical impedance spectroscopy at 400, 450, 500, 550, 600, 650, and 700°C in oxygen and oxygen-argon mixtures in half-cells with Sm 0.2 Ce 0.8 O 1.9 as the electrolyte. Relatively low activation energies (65.2, 66.9, and 56.3 kJ mol −1 for P O2 /P = 1.0, 0.1, and 0.01, respectively) for the reaction polarization resistance were observed. The specific surface area and the pore distribution were measured by N 2 adsorption method. The non-localized density functional theory was used in the analysis of the porosity data. The activity of the prepared composite depended on the pore structure which, in turns, depends on the sintering temperature. The best results were obtained for the composite sintered at the temperature of 1000°C, where significant decrease in porosity is observed. The series of 53 thermal cycles, consisting of heating to 750°C and cooling to room temperature confirmed the stability of the composite.

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Oxygen reduction at the Ag|Gd0.2Ce0.8O1.9 interface studied by electrochemical impedance spectroscopy and cyclic voltammetry at the silver point electrode

Cited by 23 publications

References 53 publications

Composite cathode materials Sm0.5Sr0.5CoO3–La0.6Sr0.4FeO3 for solid oxide fuel cells

Composite cathode materials Sm0.5Sr0.5CoO3–La0.6Sr0.4FeO3 for solid oxide fuel cells

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

Thermal shock resistant composite cathode material Sm0.5Sr0.5CoO3–δ–La0.6Sr0.4FeO3–δ for solid oxide fuel cells

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