Pratihar, S K and Basu, Rajendra Nath and Mazumder, S and Maiti, Himadri Sekhar (1999) Electrical conductivity and microstructure of Ni-YSZ anode prepared by liquid dispersion method. In: SOLID OXIDE FUEL CELLS (SOFC VI), Oct 17-22, 1999 , HONOLULU, HI .

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Abstract

Nickel - yttria stabilized zirconia (Ni-YSZ) cermet was prepared by dispersing YSZ powder in a nonaqueous nickel nitrate solution followed by milling, drying and calcination. Concentration of nickel was varied between 10 and 60 volume percent (v/o). Samples were prepared by varying sintering temperature (1200-1350 degrees C) and soaking time (2-6 h). Hydrogen treatment was done in order to reduce nickel oxide to metallic nickel. Electrical conductivity of the samples was measured in the temperature range of ambient to 1000 degrees C under hydrogen atmosphere. The temperature dependence of conductivity follows Arrhenius behavior. Plot of conductivity against temperature with nickel concentration gives rise to ``S-shaped'' curves. For each temperature a sudden rise in conductivity at around 30 v/o has been observed. The higher conductivity obtained at > 30 v/o nickel concentration is due to the percolation through interconnected Ni-chains in the YSZ matrix. A detailed microstructural investigation is also reported.

Item Type:	Conference or Workshop Item (Paper)
Additional Information:	6th International Symposium on Solid Oxide Fuel Cells (SOFC-VI),Volume: 99; HONOLULU, HI, OCT 17-22, 1999
Subjects:	Microstructure and Characterization
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	21 Jun 2012 06:40
Last Modified:	21 Jun 2012 06:40
URI:	http://cgcri.csircentral.net/id/eprint/1534

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