LOW-TEMPERATURE, ANODE-SUPPORTED HIGH POWER DENSITY SOLID OXIDE FUEL CELLS WITH NANOSTRUCTURED ELECTRODES [electronic resource].
- Salt Lake City, Utah : University of Utah, 2001.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- vp : digital, PDF file
- Additional Creators:
- University of Utah and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Anode-supported solid oxide fuel cells with Ni + yttria-stabilized zirconia (YSZ) anode, YSZ-samaria-doped ceria (SDC) bi-layer electrolyte and Sr-doped LaCoO₃ (LSC) + SDC cathode were fabricated. Fuel used consisted of H₂ diluted with He, N₂, H₂O or CO₂, mixtures of H₂ and CO, and mixtures of CO and CO₂. Cell performance was measured at 800 C with above-mentioned fuel gas mixtures and air as oxidant. For a given concentration of the diluent, the cell performance was higher with He as the diluent than with N₂ as the diluent. Mass transport through porous Ni-YSZ anode for H₂-H₂O, CO-CO₂ binary systems and H₂-H₂O-diluent gas ternary systems was analyzed using multicomponent gas diffusion theory. At high concentrations of the diluent, the maximum achievable current density was limited by the anodic concentration polarization. From this measured limiting current density, the corresponding effective gas diffusivity was estimated. Highest effective diffusivity was estimated for fuel gas mixtures containing H₂-H₂O-He mixtures (≈0.34 cm²/s), and the lowest for CO-CO₂ mixtures (≈0.07 cm²/s). The lowest performance was observed with CO-CO₂ mixture as a fuel, which in part was attributed to the lowest effective diffusivity of the fuels tested.
- Report Numbers:
- E 1.99:833838
- Published through SciTech Connect.
Anil V. Virkar.
- Type of Report and Period Covered Note:
- Other Publications;
- Funding Information:
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