Composite electrolyte with Ruddlesden-Popper structure Sm1.2Sr0.8Ni0.6Fe0.4O4 thorn d for high- performance low temperature solid oxide fuel cells

Ruddlesden-Popper (R-P) structure oxide has been widely used as the electrode material in low temperature solid oxide fuel cells (LT-SOFCs) because of its high catalytic activity and excellent oxygen transport performance, while the studies on this material served as the electrolyte of LT-SOFCs is rarely reported. Herein, the R-P P-type semiconductor Sm1.2Sr0.8Ni0.6Fe0.4O4+5 (SSNF) oxide material was prepared and then used as electrolyte by constructing P-N heter-ostructure with the N-type semiconductor Sm0.075Nd0.075Ce0.85O2-5 (SNDC) oxide material. Experimental results showed that the developed 5SSNF-5SNDC composite electrolyte exhibi-ted a high ionic conductivity of 0.201 S.cm-1 along with remarkable fuel cell power density of 1056 mW.cm-2 at 550.degrees C. The constructed P-N heterostructure helps to improve the oxygen ion conductivity and thus the electrochemical properties. These results demonstrate that P-N heterojunctions constructed from oxide materials with highly catalytically active R-P structures exhibit excellent electrolyte performance. This work provides a new perspective for developing advanced electrolytes of LT-SOFCs. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

This study reports a new Ruddlesden-Popper (R-P) structure oxide, which is widely used as the electrode material in low temperature solid oxide fuel cells (LT-SOFCs) due to its high catalytic activity and excellent oxygen transport performance. However, there are few reports on its application as the electrolyte material in LT-SOFCs. The researchers prepared a P-N heterostructure by using R-P P-type semiconductor Sm1.2Sr0.8Ni0.6Fe0.4O4+5 (SSNF) oxide material as the electrolyte and N-type semiconductor Sm0.075Nd0.075Ce0.85O2-5 (SNDC) oxide material as the cathode. The 5SSNF-5SNDC composite electrolyte exhibited a high ionic conductivity of 0.201 S.cm-1 and a remarkable fuel cell power density of 1056 mW.cm-2 at 550℃. The results indicate that P-N heterojunctions constructed from oxide materials with highly catalytically active R-P structures exhibit excellent electrolyte performance. This work provides a new perspective for developing advanced electrolytes of LT-SOFCs.