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Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
Published on: September 20, 2012
Electrochemical characterization on SDC/Na2CO3 nanocomposite electrolyte for low temperature solid oxide fuel cells
Zhan Gao1, Rizwan Raza, Bin Zhu
1Department of Energy Technology, Royal Institute of Technology (KTH), S-10044 Stockholm, Sweden.
Journal of Nanoscience and Nanotechnology
|July 21, 2011
Summary
This study details a novel samarium-doped ceria/sodium carbonate (SDC/Na2CO3) nanocomposite electrolyte for low-temperature solid oxide fuel cells. It exhibits enhanced conductivity and proton conduction, achieving a peak power density of 375 mW cm(-2) at 550°C.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Conversion
Background:
- Novel core-shell SDC/Na2CO3 nanocomposite electrolytes show promise for low-temperature solid oxide fuel cells (300-600°C).
- Further characterization of electrochemical properties and conduction mechanisms is crucial for optimizing performance.
Purpose of the Study:
- To comprehensively analyze the electrochemical properties and conduction mechanism of SDC/Na2CO3 nanocomposite electrolytes.
- To evaluate the performance of solid oxide fuel cells utilizing this novel electrolyte material.
Main Methods:
- Microstructural analysis using scanning electron microscopy (SEM) and X-ray diffraction (XRD) at various sintering temperatures.
- Electrical and electrochemical property measurements in different atmospheric conditions (H2 vs. air).
- Fuel cell performance testing and AC impedance spectroscopy under open circuit voltage (OCV).
Main Results:
- Significant conductivity enhancement observed in H2 atmosphere compared to air.
- Evidence supporting proton conduction as the dominant mechanism over electronic conduction.
- Achieved a peak power density of 375 mW cm(-2) at 550°C.
- AC impedance analysis indicated electrode polarization as the primary rate-limiting step.
Conclusions:
- The SDC/Na2CO3 nanocomposite electrolyte demonstrates excellent potential for low-temperature solid oxide fuel cells.
- Proton conduction is the key mechanism driving the enhanced performance in hydrogen-rich atmospheres.
- Electrode design and optimization are critical for further improving fuel cell efficiency.
