Download Advances in Solid Oxide Fuel Cells VII: Ceramic Engineering by Narottam P. Bansal, Prabhakar Singh, Sujanto Widjaja, Dileep PDF

By Narottam P. Bansal, Prabhakar Singh, Sujanto Widjaja, Dileep Singh

This e-book is a suite of papers from the yankee Ceramic Society's thirty fifth foreign convention on complicated Ceramics and Composites, held in Daytona seashore, Florida, January 23-28, 2011. This factor comprises papers offered within the eighth overseas Symposium on stable Oxide gas Cells: fabrics, technology, and know-how on subject matters comparable to mobilephone and Stack improvement; Electrochemical/Mechanical/Thermal functionality; Electrodes; Interconnects; Novel Cell/Stack layout and Processing; and Reliability/Degradation.Content:

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92 m2/g. 5 deg/min . Then the samples were sintere d at 1823-1923 K for 3 h in air with a heating/coolin g rate of 2 deg/min . The density of the sintered samples was measured by employing both the Archimedes principle with water and the calculatio n from the weights and the dimensions of the specimens [18]. It was found that both methods of obtaining the density provided almost the same value. The samples with relative densities of no less then 92-95% were chosen for the electrica l conductivit y measurements .

The electroni c conductivit y of solid solutions based on CeC>2 is determine d by the doping level and temperatur e [10]. iCv 5 on partial pressure at T = 1073 are shown in in Figs 8a & 8b, respectively . Figure 7. 202-6 M = Ca (a), Sr (b) 30 ■ Advances in Solid Oxide Fuel Cells VII Effect of Dopants on Ce0 2 Based Solid State Electrolytes Figure 8. A-s (b), at T = 1023 K To describe the electrolyti c propertie s of the solids the critical oxygen partial pressure p0 at which the values of the electroni c and ionic component of conductivit y are equal was used.

4, b). It was shown on the base of DFT-calcuIations [27] that these dopants have equivalen t values of binding energy in CeCfe lattice and the bulk conductivit y of solid solutions based on them are almost equal. Therefore , the values of the electrica l conductivit y of these solid solutions obtaine d by differen t authors are determined , apparently , by the conductivit y of grain boundaries . Figure 4. gLno^Oz-s at 873-1173 K (a) and 673-873 K (b). 0 >40 "2 Sm /cm at 1173 K) (Fig. 5), but an effect of Advances in Solid Oxide Fuel Cells VII • 27 Effect of Dopants on Ce0 2 Based Solid State Electrolytes increasing of conductivit y under co-doping of Ce 2by two rare earth element s was not confirmed .

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