Vanadium boron co-doped negative electrode material for fuel cell and preparation method thereof

Abstract

The invention relates to a vanadium boron co-doped negative electrode material for a fuel cell and a preparation method thereof, belongs to the technical field of negative electrode materials of fuelcells, and aims at providing a preparation method of the vanadium boron co-doped negative electrode material for the fuel cell. The method is characterized in that high valent vanadium and boron are used to dope a B site of an ABO3 type perovskite; dangling bonds of part of high valent vanadium atoms and boron atoms are actively combined, so that the activating energy of crystal lattices is improved, and meanwhile, the spontaneous polarization of a membrane material is reduced; the structure stability is improved while the internal polarization resistance is reduced; part of dangling bonds areused as oxygen ion adsorbing points, so that the transition barrier of oxygen ions are bent, and as a result, the transition capacity of the oxygen ions in the crystal lattices can be improved. The perovskite structural negative electrode material prepared by the method is high in ion transition capacity and stability under intermediate temperature and can be used in a solid fuel cell.

Description

technical field [0001] The invention relates to a vanadium-boron co-doped cathode material for fuel cells and a preparation method thereof, belonging to the technical field of fuel cell cathode materials. Background technique [0002] Solid Oxide Fuel Cell (Solid Oxide Fuel Cell, referred to as SOFC) belongs to the third-generation fuel cell, which is an all-solid-state device that directly converts the chemical energy stored in fuel and oxidant into electrical energy in an efficient and environmentally friendly manner at medium and high temperatures. Chemical power plant. Solid oxide fuel cells use hydrogen, natural gas, city gas, liquefied petroleum gas, biomass gasification gas, etc. as fuels to directly convert fuel chemical energy into electrical energy. Because SOFC has the characteristics of rich fuel, clean and efficient, and combined heat and power, it can be widely used in large-scale power plants, distributed power plants, and household combined heat and power. I...

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Problems solved by technology

[0005] However, conventional SOFCs operate at temperatures as high as 1000°C

Such a high operating temperature can ensure a sufficiently high oxygen ion conductivity of the electrolyte and a good catalytic activity of the cathode for oxygen, but it also introduces a series of problems: promoting the sintering of the porous electrode and accelerating the interfacial phase reaction between the electrode and the electrolyte As a result, the interface polarization resistance of the battery is greatly increased, and at the same time, strict requirements are placed on the sealing of the battery, the material of the bipolar plate and the auxiliary equipment of the battery

[0008] However, at lower temperatures, such as at medium temperatures (300-600°C), the catalytic activity and ion mobility of the cathode material drop sharply, and the doping modification is mainly doped with low-valence elements at the B site, so it is difficult to effectively improve its The ionic conductivity in the middle and low temperature environment, so it has very important practical significance for improving the activation energy and ionic conductivity in the middle and low temperature environment

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