Performance Study Of PrFeO₃-based Solid Oxide Fuel Cell Anode

With the development of society,the 21st century is in the era of the third energy transformation.The problems of new energy development and energy storage urgently need to be resolved.The solid oxide fuel cell?SOFC?is an all-solid-state battery.The fuel chemical energy is directly converted into electrical energy.The conversion is efficiency and clean.In the past,SOFC anodes often used Ni/YSZ cermet anodes.When using fossil fuels,they were prone to sulfur poisoning,carbon deposition,and volume instability,which limited the long-term stable operation of Ni/YSZ.Under this background,the perovskite oxidation materials stand out as SOFC anode candidate materials.In this paper,after fully investigating the SOFC perovskite oxide anode,Fe perovskite oxide?ABO₃?oxide PrFeO₃ was selected as the basic material.By doping the A and B sites,the phase stability,reduction decomposition and electrochemical performance of PrFeO₃ as anode were systematically studiedFirst,the sol-gel method was used for material synthesis.The A site of PrFeO₃ was doped with Sr elements?0,0.1,0.2,0.3,0.4,0.5?.The effect of Sr doping at A site on the phase and electrochemical stability of PrFeO₃ as anode material was systematically studied.The study found that the synthesized products are all pure orthogonal phases.After reduction at 800? for 5h in a dry hydrogen atmosphere,all six samples will be completely decomposed,while PrFeO₃ is not decomposed under a wet hydrogen atmosphere.Pr_0.6Sr_0.4FeO_3-? has the highest electrical conductivity under hydrogen atmosphere.Comparing the single cell performance test results of these anodes,it is found that the power density of the battery using Sr-doped anode is significantly higher than PrFeO₃,of which the power density of Pr_0.6Sr_0.4FeO_3-? as high as 244.9mW/cm2,the corresponding anode polarization resistance of Pr_0.6Sr_0.4FeO_3-? is the smallest,and the activation energy will decrease after doping with Sr.These results prove that Sr doping can improve the anode performance of PrFeO₃.In view of Pr_0.6Sr_0.4FeO_3-? material has good catalytic activity under hydrogen,on the basis of further research on the B site doped with different transition group metal elements,synthesis of Pr_0.6Sr_0.4Fe0.9X0.1O₃-??X=Fe,Co,Ni,Ti,Nb?series of single-phase samples,after treatment at 800? for 5h in a dry hydrogen atmosphere,the B site doped with low-valent elements Fe,Co,Ni samples completely decomposed,and doped The samples of high-priced Ti and Nb only slightly decomposed.It shows that high-valent doping helps maintain the stability of the perovskite phase.Under the air atmosphere,the conductivity of the low-valent transition group element is generally higher than that of the high-valent transition group element,but under the hydrogen atmosphere,the polarization resistance of Pr_0.6Sr_0.4FeO_3-? is still the smallest.