Ni-(Ce_0.8-xTi_x)Sm_0.2O_2-δ anode for low temperature solid oxide fuel cells running on dry methane fuel

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>A titanium-doped Ce<SUB>0.8</SUB>Sm<SUB>0.2</SUB>O<SUB>1.9</SUB> composite is developed as an anode component of low temperature solid oxide fuel cells running on methane fuel. Crystallographic parameters of (Ce<SUB>0.8-x</SUB>Ti<SUB>x</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> (0.00 < x < 0.10) are investigated with respect to the amount of titanium. The composites show a single cubic phase with the titanium amount being in the range of 0.00–0.07, while the lattice parameters decrease with increasing titanium content. The (Ce<SUB>0.8-x</SUB>Ti<SUB>x</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> composites are applied to an anode-supported single cell consisting of Ni-(Ce<SUB>0.8-x</SUB>Ti<SUB>x</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> anode/Ce<SUB>0.8</SUB>Sm<SUB>0.2</SUB>O<SUB>1.9</SUB> electrolyte/La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>Co<SUB>0.2</SUB>Fe<SUB>0.8</SUB>O<SUB>3-δ</SUB> cathode. Catalytic properties of Ni-(Ce<SUB>0.8-x</SUB>Ti<SUB>x</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> are inspected with the electrochemical performance and performance stability of the cells in dry methane fuel. The cell with Ni-(Ce<SUB>0.73</SUB>Ti<SUB>0.07</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> (x = 0.07) anode displays a low polarization resistance and an optimum maximum power density (679 mW cm<SUP>−2</SUP> at 600 °C). A performance stability investigation indicates that the cell exhibits a fairly low degradation rate of 3 mV h<SUP>−1</SUP> during a 31 h operation in dry methane. These findings suggest the application potential of the titanium doped Ce<SUB>0.8</SUB>Sm<SUB>0.2</SUB>O<SUB>1.9</SUB> for the anode of solid oxide fuel cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ti doped Ce<SUB>0.8</SUB>Sm<SUB>0.2</SUB>O<SUB>1.9</SUB> is found to be a potential anode material. </LI> <LI> Ni-(Ce<SUB>0.8-x</SUB>Ti<SUB>x</SUB>)Sm<SUB>0.2</SUB>O<SUB>2-δ</SUB> shows excellent electrochemical performance in methane. </LI> <LI> Good performance stability demonstrates application feasibility of the anode. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>