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electrochemical characterization and microstructure of Ni-YSZ anodes in solid oxide fuel cells (SOFC)

P. Ekanayake, L.J. Gauckler

1991ensolid oxidefuel cellsmicrostructureelectrochemicalNi-YSZ

Abstract

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This study investigates the performance of Ni-YSZ anodes in solid oxide fuel cells (SOFC), focusing on the electrochemical characteristics and microstructural properties related to varying NiO content. Ni-YSZ powders with NiO contents ranging from 50 to 10 wt% were synthesized and applied to YSZ electrolytes, followed by characterization under operational conditions using humidified H2 as fuel at temperatures between 700°C and 900°C. The optimal NiO content of the cermet anode was determined to be 65 wt%, which demonstrated a power output of 238 mW/ml at 800°C when combined with an appropriate cathode. Anode overpotential measured was 50 mV at a current density of 500 mA/cm², indicating good electrochemical performance. Long-term stability tests revealed that this anode maintained structural integrity, showing only a 10 mV total anode loss after extensive operation. The addition of fine zirconia particles was found to effectively hinder Ni coarsening during sintering, thus preserving fine microstructure and enhancing stability under operational conditions. These findings highlight the critical relationship between microstructure and electrochemical performance, emphasizing that controlling Ni grain growth is key to improving long-term stability in hydrogen environments.

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Cite This Work

@article{1c576dbf-8e33-4c85-b4d8-12ad4b017883,
  title={electrochemical characterization and microstructure of Ni-YSZ anodes in solid oxide fuel cells (SOFC)},
  author={P. Ekanayake and L.J. Gauckler},
  year={1991},
  language={en}
}
TY  - JOUR
TI  - electrochemical characterization and microstructure of Ni-YSZ anodes in solid oxide fuel cells (SOFC)
AU  - P. Ekanayake
AU  - L.J. Gauckler
PY  - 1991
LA  - en
ER  -

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