Layered Oxygen-Deficient Double Perovskites as Promising Cathode Materials for Solid Oxide Fuel Cells.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Conversion

Background:

• Developing advanced materials for solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) is crucial for efficient energy technologies.
• Key cathode material requirements include high electrocatalytic activity for oxygen reduction reactions (ORR), chemical and thermal stability, and compatibility with electrolytes.

Purpose of the Study:

• To review the properties of layered oxygen-deficient double perovskites as promising cathode materials for SOFCs and SOECs.
• To summarize current approaches for improving the functional characteristics of these materials.

Main Methods:

• Literature review of crystal structure, thermal properties, and electrotransport phenomena.
• Analysis of electrochemical performance, particularly in ORR.

Main Results:

• Layered oxygen-deficient double perovskites exhibit a desirable combination of properties for intermediate-temperature SOFC/SOEC operation.
• These materials demonstrate significant potential as high-performance cathode candidates.

Conclusions:

• Oxygen-deficient double perovskites are a leading class of materials for SOFC and SOEC cathodes.
• Further research into optimizing their functional characteristics is essential for advancing these energy conversion devices.