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High-Performance Protonic Ceramic Fuel Cell with Ytterbium-Doped Barium Zirconate: Reducing Cathode Polarization by
Hiroyuki Shimada1, Konosuke Watanabe1, Masaya Fujioka1
1Innovative Functional Materials Research Institute, Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 4-205 Sakurazaka, Moriyama-ku, Nagoya, Aichi 463-8560, Japan.
Optimizing the electrolyte surface condition in protonic ceramic fuel cells (PCFCs) significantly enhances cathode performance. This leads to higher power density and efficiency, crucial for commercializing advanced fuel cell technology.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Conversion
Background:
- Protonic ceramic fuel cells (PCFCs) offer high energy conversion efficiency but require improved power density for commercial viability.
- Cathode performance is a critical factor limiting the power density of PCFCs.
- Electrolyte surface conditions, including stoichiometry and element distribution, can influence cathode behavior.
Purpose of the Study:
- To investigate the impact of electrolyte surface conditions on cathode performance in Ce-free Yb-doped BaZrO3 (BZYb20) protonic ceramic fuel cells.
- To correlate electrolyte stoichiometry and element distribution with cathode polarization resistance and overall power density.
- To identify optimal electrolyte surface characteristics for achieving high-performance PCFCs.
Main Methods:
- Preparation of BZYb20 electrolytes using raw powders with different A/B ratios (Ba0.97Zr0.8Yb0.2O3-δ and Ba0.99Zr0.8Yb0.2O3-δ).
- Characterization of element distribution on electrolyte surfaces using techniques like EDX/XPS.
- Electrochemical impedance spectroscopy (EIS) and distribution of relaxation times (DRT) analysis to evaluate cathode polarization resistance.
- Performance testing of PCFCs at various temperatures (500-600 °C) to determine power density.
Main Results:
- PCFCs with a homogeneous BZYb20 electrolyte surface (Cell-99) exhibited significantly higher maximum power densities (∼1.3 W cm⁻² at 600 °C, ∼0.7 W cm⁻² at 500 °C) compared to those with heterogeneous surfaces (Cell-97).
- The homogeneous surface (Cell-99) demonstrated substantially lower cathode polarization resistance than the heterogeneous surface (Cell-97), despite using identical cathode materials.
- These results represent the highest power densities reported for PCFCs utilizing Ce-free BaZrO3-based electrolytes.
Conclusions:
- An optimized electrolyte surface condition, characterized by homogeneous element distribution, is crucial for minimizing cathode polarization resistance in PCFCs.
- Achieving high power density in PCFCs is directly linked to controlling the electrolyte's surface chemistry and element distribution.
- This study provides a pathway for developing next-generation, high-performance protonic ceramic fuel cells through tailored electrolyte surface engineering.
