Synthesis of Ni-doped LaSrMnO₃ nanopowders by hydrothermal method for SOFC interconnect applications

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>Ni-doped lanthanum strontium manganite (LSMN) nanopowders, La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>Mn<SUB>1−x</SUB>Ni<SUB>x</SUB>O<SUB>3</SUB> (0.05 ≤ x ≤ 0.3) were synthesized at 150 °C for 8 h by hydrothermal reaction as a function of Ni doping concentration. The SEM analyses suggested that the calcination treatment influenced the morphology of the nanopowders. The calcined nanopowders at 1300 °C had agglomerated spherical structure of 44–77 nm. Meanwhile, the XRD studies revealed that the nanopowders have single crystalline phase over the range x = 0.05–0.2. In addition, the LSMN nanopowders were sintered at elevated temperatures, 1250–1350 °C to examine their electrical conductivity for solid oxide fuel cell (SOFC) interconnect applications under actual SOFC working condition. Their electrical conductivity gradually increased to 90.05 S/cm with Ni doping concentration x = 0.2, which were sintered at 1300 °C. These results suggest La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>Mn<SUB>0.8</SUB>Ni<SUB>0.2</SUB>O<SUB>3</SUB> displays a good performance as an optimal composition of the LSMN.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ni-doping can improve the electrical property of lanthanum strontium manganite. </LI> <LI> Ni-doping can be completed by sintering process under appropriate temperature. </LI> <LI> The electrical conductivity is dependent on the doping amount of Ni component. </LI> <LI> The excess Ni-doping results in the creation of oxide, NiO. </LI> <LI> NiO influences negatively in their electrical property. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>