首页|Pyrochlore La2Zr2-xNixO7 anodes for direct ammonia solid oxide fuel cells
Pyrochlore La2Zr2-xNixO7 anodes for direct ammonia solid oxide fuel cells
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Developing efficient anode catalysts for direct ammonia solid oxide fuel cells(NH3-SOFCs)under intermediate-temperatures is of great importance,in support of hydrogen economy via ammonia utilization.In the present work,the pyrochlore-type La2Zr2-xNixO7+δ(LZNx,x=0,0.02,0.05,0.08,0.10)oxides were synthesized as potential anode catalysts of NH3-SOFCs due to the abundant Frankel defect that contributes to the good conductivity and oxygen ion mobility capacity.The effects of different content of Ni2+doping on the crystal structure,surface morphology,thermal matching with YSZ(Yttria-stabilized zirconia),conductivity,and electrochemical performance of pyrochlore oxides were examined using different characterization techniques.The findings indicate that the LZNx oxide behaves as an n-type semiconductor and exhibits an excellent high-temperature chemical compatibility and thermal matching with the YSZ electrolyte.Furthermore,LZN0.05 exhibits the smallest conductive band potential and bandgap,making it have a higher power density as anode material for NH3-SOFCs compared to other anodes.As a result,the maximum power density of the LZN0.05-40YSZ composite anode reaches 100.86 mW/cm2 at 800 ℃,which is 1.8 times greater than that of NiO-based NH3-SOFCs(56.75 mW/cm2)under identical flow rate and temperature conditions.The extended durability indicates that the NH3-SOFCs utilizing the LZN0.05-40YSZ composite anode exhibits a negligible voltage degradation following uninterrupted operation at 800 ℃ for 100 h.
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