کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1295324 | 1498392 | 2007 | 6 صفحه PDF | دانلود رایگان |

The effect of Mn+ cation doping on the crystal chemistry, thermal expansion coefficient (TEC), electrical conductivity, and electrochemical performance in solid oxide fuel cells (SOFC) of the Nd0.6Sr0.4Co0.8M0.2O3−δ (M = Ti, Cr, Mn, Fe, Co, and Cu) cathodes has been investigated. The samples form single-phase solid solutions with an orthorhombic perovskite structure. The degree of oxygen loss at high temperatures, TEC, and electrical conductivity decrease with the substitution of Mn+ ions for Co3+/4+ due to an increase in the thermal stability and bond strength and a decrease in the metal–oxygen covalency. The electrocatalytic activity measured with single cell SOFC decreases with Mn+ doping due to a decrease in the oxygen exchange, oxygen mobility, and charge transfer reaction, resulting from a decrease in the electronic conductivity and the oxide ion vacancy concentration.
Journal: Solid State Ionics - Volume 178, Issues 13–14, 31 May 2007, Pages 995–1000