Mo doped Ruddlesden-Popper Pr1.2Sr0.8NiO4+δ oxide as a novel cathode for solid oxide fuel cells

A new type of Ruddlesden-Popper Pr1.2Sr0.8Ni1-xMoxO4+delta (PSNMO) cathode with x = 0, 0.025, 0.050, 0.075 was prepared by the sol-gel method. The conductivity of Pr1.2Sr0.8NiO4+delta cathodes reaches the max values and then decreases the continuous increase of Mo amount in all the Mo doped cathodes. Results of elec-trochemical impedance spectroscopy show that the Pr1.2Sr0.8Ni0.950Mo0.050O4+delta has the lowest polarization resistance of 0.110 Omega cm2 at 750 degrees C among PSNMO cathodes. And results of electrical conductivity relaxation and X-ray photoelectron spectroscopy indicate that Mo-doping improves the oxygen surface exchange properties of PSNMO cathodes, which can be mainly ascribed to co-interaction of oxygen vacancy and interstitial oxygen in PSNO cathodes after Mo-doping.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

A new type of Ruddlesden-Popper Pr1.2Sr0.8Ni1-xMoxO4+delta (PSNMO) cathode with different Mo doping levels was prepared using the sol-gel method. The maximum conductivity of Pr1.2Sr0.8NiO4+delta cathodes was achieved and then decreased with the continuous increase of Mo amount in all the Mo-doped cathodes. The Pr1.2Sr0.8Ni0.950Mo0.050O4+delta cathode showed the lowest polarization resistance among the PSNMO cathodes at 750 degrees C. Mo-doping improved the oxygen surface exchange properties of PSNMO cathodes, mainly due to the co-interaction of oxygen vacancy and interstitial oxygen in PSNO cathodes after Mo-doping.