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A-Site Nonstoichiometric BaCo0.4Fe0.4Zr0.1Y0.1O3-δ Cathode for Protonic Ceramics Fuel Cells
Kangwei Wei1,2, Zhiguo Guo1,2, Fanglin Chen3
1School of Emergency Management and Safety Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, P.R. China.
ACS Applied Materials & Interfaces
|October 10, 2023
Summary
New triple-conducting materials, BaCo0.4Fe0.4Zr0.1Y0.1O3-δ (BxCFZY), show high activity as cathodes for protonic ceramic fuel cells (PCFCs). The B1.1CFZY composition achieved excellent power density and low resistance at 700 °C.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Conversion
Background:
- Protonic ceramic fuel cells (PCFCs) require efficient cathode materials for optimal performance.
- Triple-conducting materials, exhibiting proton, oxygen-ion, and electron conductivity, are promising for PCFC cathodes.
- Tuning the composition of perovskite oxides can enhance their electrochemical properties.
Purpose of the Study:
- To synthesize and characterize novel triple-conducting perovskite oxides, BaCo0.4Fe0.4Zr0.1Y0.1O3-δ (BxCFZY), as potential PCFC cathodes.
- To investigate the effect of Ba content (x = 0.9-1.1) on the material's crystal structure, conductivity, and oxygen ion transfer properties.
- To evaluate the electrochemical performance of BxCFZY cathodes in anode-supported single PCFC cells.
Main Methods:
- Synthesis of BxCFZY perovskite oxides with varying Ba content.
- Characterization of crystal structure, oxygen vacancy concentration, electrical conductivity, and oxygen ion transfer.
- Electrochemical performance testing of anode-supported single cells using BxCFZY cathodes, including power density and polarization resistance measurements.
- Application of the distribution of relaxation time (DRT) analysis to elucidate electrochemical processes.
Main Results:
- Increasing Ba content in BxCFZY led to increased oxygen vacancies and decreased electrical conductivity, indicating charge compensation via oxygen vacancies.
- The B1.1CFZY cathode composition demonstrated superior performance, achieving a power density of 1170 mW cm-2 and a polarization resistance of 0.05 Ω cm2 at 700 °C.
- DRT analysis confirmed that the B1.1CFZY cathode exhibited the best oxygen ion transfer properties, correlating with its optimal electrochemical performance.
Conclusions:
- The B1.1CFZY composition, with excess Ba on the A-site, positively impacts catalytic activity for the oxygen reduction reaction in PCFCs.
- The enhanced performance of B1.1CFZY is attributed to its superior oxygen ion transfer capabilities.
- These findings highlight the potential of BxCFZY materials as highly active cathodes for protonic ceramic fuel cells.
