Effect of anodic concentration overvoltage on power generation characteristics of solid oxide fuel cells
Current-voltage (I-V) and anodic polarisation characteristics were measured for the H2-fuelled solid oxide fuel cell with an yttria-stabilised zirconia (YSZ) electrolyte and Ni-YSZ anode. For a H2-rich H2-H2O system, the I-V curve was characterised by a high open-circuit voltage and significant conc...
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Veröffentlicht in: | Journal of the Electrochemical Society 1996-11, Vol.143 (11), p.3699-3703 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Current-voltage (I-V) and anodic polarisation characteristics were measured for the H2-fuelled solid oxide fuel cell with an yttria-stabilised zirconia (YSZ) electrolyte and Ni-YSZ anode. For a H2-rich H2-H2O system, the I-V curve was characterised by a high open-circuit voltage and significant concave bending in the small current density region. For an extremely dilute fuel condition, depletion of the fuel causes limiting current at high current densities. Significant contribution of concentration overvoltage was suggested in determining the shape of the I-V curve. The experimentally obtained anodic polarisation curve could be fitted to the calculated curve based on the concentration difference across the Ni-YSZ anode layer. The effective diffusion coefficient of the Ni-YSZ cermet which affects the anodic polarisation, is estimated to be 0.01 to 0.1 cm2/s. The electrode polarisation conductivity was maximum at oxygen partial pressure of about 10 exp(-8) Pa. 16 refs. |
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ISSN: | 0013-4651 1945-7111 |
DOI: | 10.1149/1.1837274 |