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Enhanced ionic conductivity of Yttria-stabilized ZrO_2 nanoparticles composited with natural CuFe-oxide mineral for low temperature advanced solid oxide fuel cells

Rong Xu  Jing Zhang  Xunying Wang  Wei Zhang  Xiang Yang  Yan Wu  Bin Zhu  
【摘要】:Tradition 8 mol.% Y_2O_3–stabilized ZrO_2(YSZ) as an electrolyte for solid oxide fuel cells(SOFCs) can be only operated at high temperature(800~(-1)000 oC) because a sufficient ionic conductivity,0.1 S cm~(-1) is only activated at 1000 oC.While when YSZ composited with natural Cu Fe-oxide mineral(CF),greatly enhanced ionic conductivity in low temperature range(500-600 oC),0.48 S cm~(-1) is achieved at 550 oC.The CF-YSZ composite was synthesized via a solid state reaction method.The fuel cells were fabricated by using a thin CF-YSZ electrolyte layer between the symmetric electrodes of Ni0.8Co0.2Al0.5Li(NCAL) coated Ni foam.The maximum power output of 562 mW cm~(-2) has been achieved at 550 oC.Even using the natural delafossite itself as an electrolyte,the maximum power reached 281 mW cm~(-2)at the same temperature.Compared to the YSZ electrolyte fuel cell using the Ni O anode,La SrC o Fe-perovskite oxide cathode,lower than 150 mW cm~(-2) could be obtained at 550 oC.Different ion-conduction mechanism from the YSZ in the CF-YSZ is proposed to provide a new approach to developments of natural mineral composites for advanced fuel cell applications.

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