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NiO-Ba0.95Ca0.05Ce0.9Y0.1O3-δ as a Modified Anode Material Fabricated by the Tape Casting Method
Magdalena Dudek1, Bartłomiej Lis1, Ryszard Kluczowski2
1Faculty of Energy and Fuels, AGH University of Science and Technology, Av. A. Mickiewicza 30, 30-059 Krakow, Poland.
Materials (Basel, Switzerland)
|April 12, 2022
Summary
Chemically resistant anodes are crucial for protonic ceramic fuel cells (PCFCs). A new composite anode material, Ni-5CBCY, demonstrates stable electrical conductivity, making it suitable for PCFC applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Conversion
Background:
- Protonic ceramic fuel cells (PCFCs) require chemically resistant anodes to avoid expensive hydrogen purification.
- Ba0.95Ca0.05Ce0.9Y0.1O3-δ (5CBCY) offers improved chemical resistance compared to similar perovskites.
Purpose of the Study:
- To evaluate the performance of a composite NiO-5CBCY anode material for PCFCs.
- To assess the chemical and electrical stability of the Ni-5CBCY anode under operating conditions.
Main Methods:
- Tape casting and sintering of a slurry containing 5CBCY, NiO, and graphite.
- Thermal treatment in a hydrogen/argon atmosphere at 700 °C.
- Characterization using XRD, SEM, DTA, TGA, MS, AC four-probe, and electrochemical impedance spectroscopy.
Main Results:
- The Ni-5CBCY cermet exhibited good electrical conductivity (1.1 S/cm in H2-Ar, 0.8 S/cm with 5% CO2 at 700 °C).
- The anode material showed repeatable conductivity during oxidation and reduction cycles.
- The material demonstrated sufficient stability for preliminary PCFC testing.
Conclusions:
- The developed Ni-5CBCY composite anode is a promising candidate for PCFC applications due to its chemical resistance and stable electrical properties.
- This material could potentially reduce the need for costly hydrogen purification in PCFC systems.
