Ca substituion instead of Sr in La$_{0.58}$Sr$_{0.4}$Co$_{0.2}$Fe$_{0.8}$O$_{3-\delta}$ as a cathode electrode for IT-SOFCs

TL;DR

This study explores calcium substitution in a specific perovskite cathode material for IT-SOFCs, demonstrating how sintering temperature influences its electrochemical performance and reducing area specific resistance.

Contribution

It introduces calcium substitution in La$_{0.58}$Sr$_{0.4}$Co$_{0.2}$Fe$_{0.8}$O$_{3-elta}$ and evaluates its performance as a cathode for IT-SOFCs, highlighting the impact of sintering temperature.

Findings

Optimal sintering at 950°C yields low ASRs at various temperatures.

Calcium substitution improves cathode performance.

Lower ASRs achieved at higher sintering temperatures.

Abstract

La$_{0.58}$Ca$_{0.4}$Co$_{0.2}$Fe$_{0.8}$O$_{3-\delta}$ (L58CCF) was synthesized and evaluated as a cathode electrode for intermediate temperature solid oxide fuel cells (IT-SOFC) based on the Y$_2$O$_3$-stabilized ZrO$_2$ (YSZ) electrolyte. The effect of sintering temperature on the L58CCF performance was investigated. The best Area specific resistances (ASRs) for the L58CCF sintered at 950 $^{\circ}$C were 1.218, 0.447, 0.228, 0.156, 0.099 $\Omega.cm^{2}$ at 600, 650, 700, 750, 800 $^{\circ}$C, respectively.