Preparation And Properties Of NdBaFe₂O_5+? Based Anode Materials

The new energy and green energy are getting more and more attention because the exhaustion of the traditional energy sources, the environmental pollution and the greenhouse effect of fossil fuels are becoming more and more serious. Solid oxide fuel cell?SOFC? has received great attention because of its high efficiency and strong adaptability. As a key part of SOFC, the development of anode material has been a research hotspot. The traditional Ni/YSZ anode material can produce carbon deposition under the fuel of hydrocarbon, while the anode material with double perovskite structure is a hot spot in the current research.NdBaFe₂O_5+??NBFO? materials were prepared by sol-gel method, and Sm_0.2Ce_0.8O_1.9?SDC? was used to prepare a composite anode with a physical mixture with NBFO. The product structure, surface morphology, electrical properties and electrochemical properties were tested. The results show that the electrical conductivity of NBFO-SDC composite anode is decreased with the increase of SDC, and the electrochemical performance of the battery was improved by the increase of the three-phase interface of the battery. The mass ratio of NBFO and SDC at 8:2 composite anode exhibits the best battery performance, when use H₂ as fuel, the highest power density can be 733 mW/cm² at 850 oC, while CH₄ used as fuel, the highest power density is 189 mW/cm² at 900 oC.NBFO-SDC composite anode materials were prepared by impregnation with SDC nitrate solution. The effect of the introduction of SDC nanoparticles on the surface morphology and electrochemical properties of the materials was studied. With the increase of SDC impregnation times, the AC impedance value of the composite anode decreases firstly and then increases; the battery performance increases first and then decreases. The anode material impregnated with 2 times has the best performance of the batter. When use H₂ as fuel, the highest power density can be 632 mW/cm² at 850 oC, while CH₄ used as fuel, the highest power density is 253 mW/cm² at 900 oC.Finally, the SDC modified NBFO anode material showed excellent electrochemical performance in H₂ and CH₄, will become a new type of anticarbon solid oxide fuel cell anode material.