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. 2022 Apr 14;27(8):2549.
doi: 10.3390/molecules27082549.

Layering Optimization of the SrFe0.9Ti0.1O3-δ-Ce0.8Sm0.2O1.9 Composite Cathode

Azreen Junaida Abd Aziz  1 , Nurul Akidah Baharuddin  1 , Mahendra Rao Somalu  1 , Andanastuti Muchtar  1   2
Affiliations

Layering Optimization of the SrFe0.9Ti0.1O3-δ-Ce0.8Sm0.2O1.9 Composite Cathode

Azreen Junaida Abd Aziz et al. Molecules. .

Abstract

Cathode thickness plays a major role in establishing an active area for an oxygen reduction reaction in energy converter devices, such as solid oxide fuel cells. In this work, we prepared SrFe0.9Ti0.1O3-δ-Ce0.8Sm0.2O1.9 composite cathodes with different layers (1×, 3×, 5×, 7×, and 9× layer). The microstructural and electrochemical performance of each cell was then explored through scanning electron microscopy and electrochemical impedance spectroscopy (EIS). EIS analysis showed that the area-specific resistance (ASR) decreased from 0.65 Ωcm2 to 0.12 Ωcm2 with the increase in the number of layers from a 1× to a 7×. However, the ASR started to slightly increase at the 9× layer to 2.95 Ωcm2 due to a higher loss of electrode polarization resulting from insufficient gas diffusion and transport. Therefore, increasing the number of cathode layers could increase the performance of the cathode by enlarging the active area for the reaction up to the threshold point.

Keywords: area-specific resistance; electrochemical impedance; layered structures; microstructures; solid oxide fuel cell.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
X-ray diffraction patterns of the fabricated 9SFT-1SDC composite cathode, SFT and SDC.
Figure 2
Figure 2
SEM images of the cross-section of (a) 1× printing, (b) 3× printing, (c) 5× printing, (d) 7× printing, and (e) 9× printing. EDX image is for powder 9SFT-1SDC.
Figure 3
Figure 3
Thickness of 9SFT-1SDC composite cathode deposited on SDC electrolyte.
Figure 4
Figure 4
Porosity for (a) 1× printing, (b) 3× printing, (c) 5× printing, (d) 7× printing, and (e) 9× printing calculated using ImageJ software.
Figure 5
Figure 5
Illustration of the print screen with manually applied load. (a) Overall setup for the cathode film printing, (b) 1× printing, (c) 3× printing, and (d) 5× printing.
Figure 6
Figure 6
Nyquist plot (impedance spectrum) of the symmetric 9SFT-1SDC cells with 1×, 3×, 5×, 7×, and 9× layer printing and the equivalent circuit.
See this image and copyright information in PMC

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