La(0.4)Sr(0.6)Co(0.2)Fe(0.7)Nb(0.1)O(3-δ)(LSCFN)was applied as both anode and cathode for symmetrical solid oxide fuel cells(SSOFCs)with zirconia based electrolyte.The cell with LSCFN electrode was fa...La(0.4)Sr(0.6)Co(0.2)Fe(0.7)Nb(0.1)O(3-δ)(LSCFN)was applied as both anode and cathode for symmetrical solid oxide fuel cells(SSOFCs)with zirconia based electrolyte.The cell with LSCFN electrode was fabricated by tape-casting and screen printing.Fabrication process was optimized firstly by comparing co-sintering and separate-sintering of electrode and electrolyte.To further improve the LSCFN electrode properties,oxygen ionic conductor of Gd(0.1)Ce(0.9)O(2-δ)(GDC)was added into the LSCFN electrode.The preferred composition of LSCFN-GDC composite electrode was found to be 1:1 in weight ratio with polarization resistance of 0.16Ωcm^2at 800~℃.The maximum power densities of LSCFN-GDC||GDC/YSZ/GDC||LSCFN-GDC tested in H2and CH4with 3%H2O were 395 m W cm^(-2)and 124 m W cm^(-2)at 850~?C,respectively,which were much higher than that of LSCFN||GDC/YSZ/GDC||LSCFN cells at same condition,possibly due to the extension of the triple phase boundary induced by the addition of GDC.The cell showed reasonable stability using H2and CH4with 3%H2O as fuels and no significant power output degradation was observed after total 200 h operation.展开更多
基金supported by the National Natural Science Foundation of China (No. 51402355)Natural Science Foundation of Beijing Project (Nos. LJ201531 and 2154056)+1 种基金Shanxi Province Project (No. MD2014-08)Guangdong Project (No. 201460720100025)
文摘La(0.4)Sr(0.6)Co(0.2)Fe(0.7)Nb(0.1)O(3-δ)(LSCFN)was applied as both anode and cathode for symmetrical solid oxide fuel cells(SSOFCs)with zirconia based electrolyte.The cell with LSCFN electrode was fabricated by tape-casting and screen printing.Fabrication process was optimized firstly by comparing co-sintering and separate-sintering of electrode and electrolyte.To further improve the LSCFN electrode properties,oxygen ionic conductor of Gd(0.1)Ce(0.9)O(2-δ)(GDC)was added into the LSCFN electrode.The preferred composition of LSCFN-GDC composite electrode was found to be 1:1 in weight ratio with polarization resistance of 0.16Ωcm^2at 800~℃.The maximum power densities of LSCFN-GDC||GDC/YSZ/GDC||LSCFN-GDC tested in H2and CH4with 3%H2O were 395 m W cm^(-2)and 124 m W cm^(-2)at 850~?C,respectively,which were much higher than that of LSCFN||GDC/YSZ/GDC||LSCFN cells at same condition,possibly due to the extension of the triple phase boundary induced by the addition of GDC.The cell showed reasonable stability using H2and CH4with 3%H2O as fuels and no significant power output degradation was observed after total 200 h operation.