Application of Promising Electrode Materials in Contact with a Thin-Layer ZrO2-Based Supporting Electrolyte for Solid Oxide Fuel Cells

Energies

VadimA. Eremin¹  AlenaS. Lesnichyova¹  DenisA. Osinkin¹  AnnaV. Khodimchuk¹  AntonV. Kuzmin¹  MaximV. Ananyev¹  AndreyS. Farlenkov¹  EvgeniyS. Tropin¹  EkaterinaP. Antonova¹  AnastasiaI. Kovrova¹  EfimI. Chernov²  MikhailE. Chernov² 

[1] Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg 620137, Russia;“Ekon” Ltd, Obninsk 249037, Russia;

关键词: thin-layer supporting electrolyte;    triple-layer electrolyte;    conductivity;    drt;    sofc;   

DOI  :  10.3390/en13051190

来源: DOAJ

【 摘 要 】

The paper presents the results of an investigation into thin single- and triple-layer ZrO₂-Sc₂O₃-based electrolytes prepared using the tape-casting technique in combination with promising electrodes based on La₂NiO_4+δ and Ni-Ce_0.8Sm_0.2O_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∙cm² 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/cm² at 850 °C was obtained using wet hydrogen as fuel and air as an oxidizing gas.

【 授权许可】

Unknown