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Ceria electrolytes voltage

FIGURE 1.34 Comparison in open-circuit voltage of a unit cell with gadolinia-doped ceria electrolyte containing 3 mol% of Ln(Y, Sm, Nd, Pr, and La) codopant [134]. [Pg.41]

The open-circuit voltages (V0c) of SOFCs with doped-ceria electrolytes are relatively low. SOFC can be considered an oxygen concentration cell. The open-circuit... [Pg.50]

Maximum Power Output (WM) and Open-Circuit Voltage (Voc) for SOFCs with Doped-Ceria Electrolytes... [Pg.54]

Tsai et al. (1997) reported building soUd-oxide fuel cells with an electrolyte of yttrium-doped ceria that was 4 to 8 p,m thick. A thin layer (1 to 1.5 p,m) of a second electrolyte, of the YSZ type, was deposited between the electrolyte and the anode to eliminate the influence of electronic conductivity of the electrolyte. A cell having this bilayer electrolyte had an OCV of 98% of the theoretical EMF, which shows that there is no effect of the electronic component of conduction (without the second YSZ electrolyte, the OCV was only 50% of the theoretical value). At 600°C the electrolyte had a resistivity of 0.25 cm. At a current density of 400 mA/cm, the cell voltage was 0.4 V. The maximum energy density was 210 mW/cm. At 550°C, the resistivity of the electrolyte was 0.45 cm ... [Pg.153]

Doshi et al. (1999) used an electrolyte of ceria-doped gallate (CeGO) 30 p,m thick. In the cell, a two-phase cathode 250 p,m thick was used that consisted of a cermet of 45 to 55% silver and electrolyte material in the form of yttria-doped bismuth oxide (YDB). An Ni-CeGO cermet served as the anode. At a working temperature of 500°C and a ceU voltage of 0.6 V, the current density was 100 mA/cm at a cell voltage of 0.4 V, the current density was 3(K) mA/cm. It is interesting to note that in this cell, the contributions of the ohmic resistance of the electrolyte (0.7 cm ) and of cathode polarization (0.6 cm ) to the... [Pg.153]

A number of works have addressed the modeling of ceria-based electrolytes or more generally the modeling of electrolytes that are mixed ionic and electronic conductors (MIECs). MIEC electrolytes connected to an external electrical circuit but with reversible electrodes have been discussed extensively in the literature and a few references are given The current/voltage relations for... [Pg.681]


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See also in sourсe #XX -- [ Pg.53 ]




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Ceria

Ceria electrolytes

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