Long-term electric conductivity of (Nb,Y)-doped Bi 2O 3 solid electrolytes for solid oxide fuel cells
Journal
Advanced Materials Research
Journal Volume
509
Pages
111-113
Date Issued
2012
Author(s)
Wei, W.-C.J.
Abstract
Two oxides, Y 2 O 3 and Nb 2 O 5 , were doped into Bi 2 O 3 -based electrolyte in a composition of (Bi 1-x-y ,Nb x ,Y y ) 2 O 3 , where (x+y)=0.12 to 0.2 and the x:y ratio 3:1 to 1:3. The delta-phase retention, the oxygen vacancy order-disorder transformation, the ionic and electric conductivity were investigated by various techniques. The long-term conductivity of the dense electrolytes was determined showing moderate degradation due to phase transformation possible triggered by surface evaporation of Bi-oxide. The best retention of the conductivity is about 60% after 300 hr test.
Type
conference paper