Sr-free orthorhombic perovskite Pr0.8Ca0.2Fe0.8Co0.2O3-8 as a high-performance air electrode for reversible solid oxide cell

Reversible solid oxide cells (RSOCs) as clean and efficient electrochemical conversion and storage devices have received much attention. PrFeO3-8 has been investigated to obtain excellent performance when it is used as air electrode for RSOCs. In this work, we investigate a novel PrFeO3-8 based orthorhombic perovskite oxide Pr0.8Ca0.2Fe0.8Co0.2O3-8 and use it as the air electrode of RSOCs. The electrochemical performance of this cell with Pr0.8Ca0.2Fe0.8Co0.2O3-8 electrode is presented in detail. The highest power density at 850 C can reach 1.762 W cm(-2) in fuel cell mode using hydrogen as fuel. And the electrolysis current density of 2.23 A cm(-2) at 850 C can be achieved under the condition of 50 vol % absolute humidity at 1.3 V in electrolysis cell mode. Moreover, during a long-term operation of up to 200 h, this cell can remain stable and shows good reversibility in two modes. These results demonstrate that the perovskite Pr0.8Ca0.2Fe0.8Co0.2O3-8 is promising air electrode for RSOCs.

Automated summary

This study investigates the performance of a novel Pr0.8Ca0.2Fe0.8Co0.2O3-8 oxide as an air electrode for RSOCs. The results demonstrate that this electrode achieved high power density and electrolysis current density under high temperature conditions, while maintaining stability and reversibility.