SrCe0.9In0.1O3-δ-based reversible symmetrical Protonic Ceramic Cell

In-doped SrCe0.9In0.1O3-delta (SCI) perovskite-type oxide is utilized as the solid electrolyte, as well as a component, together with SrFe0.75Mo0.25O3-delta (SFM) compound, in the composite-type electrodes to construct symmetrical Protonic Ceramic Fuel Cells (PCFC). With good mutual stability of SCI and SFM at high temperatures in water vapor-containing reducing and oxidizing conditions, as well as sufficient ionic conductivity with high proton transference number of SrCe0.9In0.1O3-delta, and high electronic conduction of SrFe0.75Mo0.25O3-delta, effectiveness of the electrochemical reactions is ensured. It is documented that 80:20 wt.% SFM-SCI electrode performs better, comparing to the one having 50:50 wt.% ratio of both compounds, with both electrodes showing lower polarization resistance values in the reducing conditions. Symmetrical SCI-SFM|SCI|SCI-SFM cells can be operated in normal (PCFC) and reversed, Protonic Ceramic Electrolyzer Cell (PCEC) mode, showing similar shape of current density-voltage characteristics. The maximum obtained power density is 32 mW cm(-2) at 800 degrees C.

Automated summary

In this study, In-doped SrCe0.9In0.1O3-delta (SCI) and SrFe0.75Mo0.25O3-delta (SFM) were used as solid electrolyte and composite electrodes to construct symmetrical Protonic Ceramic Fuel Cells (PCFC). The SCI-SFM composite electrodes exhibited good mutual stability at high temperatures, enabling effective electrochemical reactions. The optimal 80:20 wt.% SFM-SCI electrode showed lower polarization resistance and higher power density compared to the 50:50 wt.% ratio, with similar performance in both PCFC and Protonic Ceramic Electrolyzer Cell (PCEC) modes.