Recent Advances in Barium Cobaltite-Based Perovskite Oxides as Cathodes for Intermediate-Temperature Solid Oxide Fuel...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Conversion

Background:

• Solid oxide fuel cells (SOFCs) offer high efficiency but are limited by high operating temperatures.
• Reducing SOFC operating temperatures to the intermediate-temperature (IT, 500–800 °C) range is crucial for practical applications.
• Conventional cathodes exhibit poor activity for the oxygen reduction reaction (ORR) at reduced temperatures.

Purpose of the Study:

• To review recent advances in BaCoO3-δ-based perovskite cathodes for IT-SOFCs.
• To highlight material design strategies for enhancing cathode performance and durability.
• To identify challenges and future research directions for BaCoO3-δ cathodes.

Main Methods:

• Review of literature on BaCoO3-δ perovskite materials for IT-SOFC cathodes.
• Analysis of material design strategies: doping, deficiency control, and composite formation.
• Evaluation of strategies for improving ORR activity, durability, and thermal compatibility.

Main Results:

• BaCoO3-δ perovskites possess high free lattice volume and oxygen vacancy content, suitable for IT-SOFC cathodes.
• Functional doping, deficiency control, and (nano)composite construction effectively enhance ORR activity and durability.
• These strategies also improve thermal compatibility, a key factor for practical SOFCs.

Conclusions:

• BaCoO3-δ-based cathodes are promising for IT-SOFCs, but challenges in structural stability and ionic conductivity remain.
• Material design strategies offer pathways to overcome limitations and improve performance.
• Further research is needed to optimize BaCoO3-δ electrocatalysts for energy conversion and storage technologies.