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

Abstract

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 La2NiO4+δ and Ni-Ce0.8Sm0.2O2-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.

Revealing the degradation mechanism of the lanthanum nickelates based double‐layer electrodes during long‐term tests in contact with chromium‐containing steel interconnects

“…An asymmetrical solid oxide electrochemical cell consisted of an electrolyte substrate as well as a double‐layer electrode and Pt reference electrode deposited on the opposite sides of the substrate. The technology for their fabrication is described in detail in Reference 61. La 2 NiO 4+ δ , LaNi 0.6 Fe 0.4 O 3− δ , and Ce 0.8 Sm 0.2 O 2− δ powders were prepared via a glycerol‐nitrate method.…”

Performance Enhancement of Ce0.8Sm0.2O1.9-Supported SOFC by Electrophoretic Formation of Modifying BaCe0.8Sm0.2O3 and Ce0.8Sm0.1Pr0.1O1.9 Layers

“…The design of solid oxide fuel cells (SOFCs) with a supporting electrolyte membrane is considered to be promising in terms of advantages, such as mechanical strength of the structure, reliable separation of gas channels, and the possibility of reducing the polarization resistance due to porous, thin-film electrodes [ 1 , 2 , 3 , 4 ]. Despite a large number of works on thin-film electrolytes obtained by different methods [ 5 , 6 , 7 ], the development of SOFCs with a carrier electrolyte highlights directions for the creation of efficient and time-reliable SOFCs.…”

Time-Dependent Density Functional Theory Calculations of N- and S-Doped TiO2 Nanotube for Water-Splitting Applications

“…Among all photocatalytic materials, titania (TiO 2 ) has been widely investigated since it was described for the first time by Fujishima and Honda [1]. The band gap width of TiO 2 (from 3.0 to 3.2 eV) allows efficient water-splitting under UV irradiation due to the positions of band edges-valence band maximum (VBM) of TiO 2 is located below the oxidation potential of water, while its conduction band minimum (CBM) is located above the proton reduction potential in many synthesized TiO 2 -based compounds [2][3][4][5][6][7][8][9][10][11][12]. However, the relatively wide band gap of undoped TiO 2 leads to relatively poor efficiency of light absorption in the visible range of solar spectrum.…”