LaCrO₃-Coated La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ Core-Shell Structured Cathode with Enhanced Cr Tolerance for...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Conversion

Background:

• La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ (LSCF) is a preferred cathode for intermediate-temperature solid oxide fuel cells due to its high oxygen reduction reaction activity.
• Chromium (Cr) poisoning significantly degrades the electrochemical performance and long-term stability of LSCF cathodes.

Purpose of the Study:

• To develop a LaCrO3-coated LSCF core-shell structured (LCr@LSCF) cathode with improved chromium tolerance.
• To investigate the effect of a LaCrO3 coating on the stability and performance of LSCF cathodes under Cr-containing environments.

Main Methods:

• Solution infiltration method was employed to create the LaCrO3 shell on the LSCF core.
• Electrochemical performance and long-term stability tests were conducted to evaluate the Cr tolerance of the LCr@LSCF cathode.

Main Results:

• The LCr@LSCF cathode exhibited significantly enhanced long-term stability and chromium tolerance compared to bare LSCF.
• A slight decrease in electrochemical performance was observed after the LaCrO3 coating, but the improved Cr tolerance is a key advantage.

Conclusions:

• The development of a LaCrO3-coated LSCF core-shell cathode (LCr@LSCF) offers a promising strategy to mitigate Cr poisoning in solid oxide fuel cells.
• The enhanced Cr tolerance of LCr@LSCF is critical for the commercialization and widespread application of LSCF-based cathode materials.