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 ebook 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 good Oxide gas Cells: fabrics, technology, and know-how on issues akin 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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Extra info for Advances in Solid Oxide Fuel Cells VII: Ceramic Engineering and Science Proceedings, Volume 32

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71 The dependenc e of the total electrica l conductivit y on oxygen partial pressure It is well known that the rate of electrochemica l reaction s in solid oxide fuel cells is determine d by the driving forces of the processes , which, in turn, are determine d by the differenc e of partial pressure of oxygen in the anode and cathode channels. The greate r this difference , the higher the power output of electrochemica l cell is. 21-1 atm. Problems 15 arise in reducing conditions (anode channel), since at the partial pressure of oxygen below 10" atm cerium systems are characterize d by the appearanc e of electroni c conductivit y due to the partial reductio n of Ce4+ > Advances in Solid Oxide Fuel Cells VII • 29 Effect of Dopants on Ce0 2 Based Solid State Electrolytes Ce3+.

Fig. 2026 solid solutions in high (873-1173 K) and low (673-873 K) temperatur e ranges. As the transitio n point betwee n the temperature’ s ranges a critical temperatur e Tc of 873 K was taken. 9 5 - 856 – 45 K [25]) the formatio n of the dopant cation - oxygen vacancies complexes plays a significant role. The dopant cations may not only actjust as traps for isolated vacancies,but also as nuclei for the formation of ordered-vacanc y clusters. In accordanc e with this assumption the Arrenius plot for ceria based systems would gives two straight lines, which intersect s at Tc with activatio n energies Ei=A H and Ei=AH m +AH t, where AH m - the migration energy of oxygen vacancies, AH t - the trapping energy betwee n vacancies and cations [18].

Recommende d for use in intermediat REFERENCE S ’V . V. Kharton, F. M . Figuiredo, L. Navarro, E. N. Naumovich, A. V. Kovalevsky, A. A. Yaremchenko, A. P. Viskup, A. Cameiro, F. M . B. Marques and J. Frade, Ceria -based material s for solid oxide fuel cells, J. Mat. Seien.. 1105-17(2001) . 2 H. Yahiro, K. Eguchi and H. Arai, Electrical propertie s and reducibilit y of ceria-rar e earth oxide systems and their applicatio n to solid oxide fuel cell, S. S. , 36,71-75 (1989). B. S. Glass, AC-Impedance Studies ofRare-Earth-Oxid e Doped Ceria, S S.

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