Composite Anodes with Ni Impregnated LST-SSZ for Direct Methane Solid Oxide Fuel Cells

doi:10.15541/jim20140083

Abstract

Abstract:

Solid Oxide Fuel Cells (SOFCs) is one of the most attractive energy conversion devices because of their high efficiency, low pollution, and fuel flexibility. La_0.2Sr_0.8TiO₃ (LST) anode material shows its potential utilization in direct oxidation of methane fuel without carbon formation. In this paper, LST powders were synthesized by traditional solid-state method, and then mixed with scandia-stabilized zirconia (SSZ) in mass ratio of 5: 5 to prepare the composite anode materials. Symmetrical cells with LST-SSZ composite anode were fabricated and measured. Their polarization resistances in hydrogen at 700℃, 750℃ and 800℃ were 5.3, 3.0 and 2.0 ?·cm², respectively. Considering the insufficient conductivity of LST, 10wt%Ni was impregnated into the composite anode to improve the anode performance. The polarization resistance of the symmetrical cell with 10wt% Ni impregnation load is obviously reduced. The maximum power density of a cathode supported single cell with 10wt%Ni-LST-SSZ composite anode are 225 mW/cm² and 175 mW/cm² in hydrogen and in methane at 750℃, respectively, and the single cell shows its stability running in methane fuels.

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Key words: impregnation, composite anode materials, polarization resistance, methane

CLC Number:

TM911

LIU Ya-Di, YUAN Chun, ZHOU Yu-Cun, ZOU Jie, XIN Xian-Shuang, WANG Shao-Rong. Composite Anodes with Ni Impregnated LST-SSZ for Direct Methane Solid Oxide Fuel Cells[J]. Journal of Inorganic Materials, 2014, 29(11): 1121-1126.

Figures/Tables 9

Fig. 1 XRD patterns of LST powders sintered at 950℃, 1200℃ and 1400℃, and reduced at 800℃ for 10 h

Fig. 2 Thermal expansion behavior of LST samples in air

Fig. 3 Arrhenius plot of conductivity of LST sample in hydrogen

Fig. 4 EIS and Bode plots of LST-SSZ/YSZ/LST-SSZ anode sym--metric cells

Fig. 5 SEM image of LST-SSZ/YSZ/LST-SSZ anode sym-metric cell

Fig. 6 EIS and Bode plots of 10wt%Ni-LST-SSZ/YSZ/10wt%Ni-LST-SSZ anode symmetric cells in (a, b) hydrogen and (c, d) methane

Fig. 7 Cross-sectional SEM images of the anode in 10wt%Ni-LST-SSZ/YSZ/10wt%Ni-LST-SSZ anode symmetric cell after test

Fig. 8 The performance of 10wt%Ni- LST-SSZ/SSZ/LSM- SSZ/ LSM single cell

Fig. 9 Performance stability of 10wt%Ni-LST-SSZ/SSZ/LSM- SSZ/LSM single cell running in methane fuel

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