Medium-Entropy SrV_1/3Fe_1/3Mo_1/3O₃ with High Conductivity and Strong Stability as SOFCs High-Performance Anode

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Solid oxide fuel cells (SOFCs) require anode materials with high chemical stability, electronic conductivity, and catalytic activity.
• Perovskite oxides are promising candidates for SOFC anodes, but often face challenges in stability under reducing conditions.

Purpose of the Study:

• To synthesize and characterize a novel medium-entropy perovskite oxide, SrVFeMo (SVFMO), for SOFC anode applications.
• To evaluate the physicochemical properties, electronic conductivity, and catalytic performance of SVFMO in a reducing environment.

Main Methods:

• Fabrication of medium-entropy SrVFeMo (SVFMO) perovskite oxide in a reducing H2/Ar atmosphere.
• Characterization of physicochemical stability, electronic conductivity, and catalytic oxidation of fuel gas.

Main Results:

• SVFMO exhibits enhanced physicochemical stability in reducing SOFC environments.
• The co-existence of Fe, V, and Mo in SVFMO promotes small-polaron hopping, leading to significantly improved electronic conductivity (70 S cm⁻¹ at 800 °C).
• SVFMO demonstrates high catalytic activity for fuel oxidation, achieving a power density of 720 mW cm⁻² at 850 °C.

Conclusions:

• Medium-entropy SrVFeMo perovskite oxides are excellent candidates for SOFC anodes due to their superior stability and conductivity.
• The unique composition of SVFMO enhances its performance as a functional anode layer for efficient fuel utilization in SOFCs.