Application of Promising Electrode Materials in Contact with a Thin-Layer ZrO 2 -Based Supporting Electrolyte for Solid Oxide Fuel Cells

Denis A. Osinkin, Ekaterina P. Antonova, Alena S. Lesnichyova, Evgeniy S. Tropin, Mikhail E. Chernov, Efim I. Chernov, Andrey S. Farlenkov, Anna V. Khodimchuk, Vadim A. Eremin, Anastasia I. Kovrova, Anton V. Kuzmin and Maxim V. Ananyev
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Denis A. Osinkin: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Ekaterina P. Antonova: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Alena S. Lesnichyova: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Evgeniy S. Tropin: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Mikhail E. Chernov: “Ekon” Ltd, Obninsk 249037, Russia
Efim I. Chernov: “Ekon” Ltd, Obninsk 249037, Russia
Andrey S. Farlenkov: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Anna V. Khodimchuk: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Vadim A. Eremin: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Anastasia I. Kovrova: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Anton V. Kuzmin: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia
Maxim V. Ananyev: Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia

Energies, 2020, vol. 13, issue 5, 1-12

Abstract: The paper presents the results of an investigation into thin single- and triple-layer ZrO 2 -Sc 2 O 3 -based electrolytes prepared using the tape-casting technique in combination with promising electrodes based on La 2 NiO 4+δ and Ni-Ce 0.8 Sm 0.2 O 2-δ materials. It is shown that pressing and joint sintering of single electrolyte layers allows multilayer structures to be obtained that are free of defects at the layer interface. Electrical conductivity measurements of a triple-layer electrolyte carried out in longitudinal and transverse directions with both direct and alternating current showed resistance of the interface between the layers on the total resistance of the electrolyte to be minimal. Long-term tests have shown that the greatest degradation in resistance over time occurs in the case of an electrolyte with a tetragonal structure. Symmetrical electrochemical cells with electrodes fabricated using a screen-printing method were examined by means of electrochemical impedance spectroscopy. The polarization resistance of the electrodes was 0.45 and 0.16 Ohm?cm 2 at 800 °C for the fuel and oxygen electrodes, respectively. The distribution of relaxation times method was applied for impedance data analysis. During tests of a single solid oxide fuel cell comprising a supporting triple-layer electrolyte having a thickness of 300 microns, a power density of about 160 mW/cm 2 at 850 °C was obtained using wet hydrogen as fuel and air as an oxidizing gas.

Keywords: thin-layer supporting electrolyte; triple-layer electrolyte; conductivity; DRT; SOFC (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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