Anode of 500-800 deg.C medium temperature solid oxide fuel battery and its preparation method

Abstract

This invention relates to the anode of 500-800deg.C medium solid oxide fuel battery and its preparation method characterizing in doping perovskite type lanthanum chromate material at A and B bits to form a porous compound material composed of a metal and ceramics to make it to powder to be added with water and a methyl fibrin and a soluble starch are processed to a battery anode biscuit to be calcined to an anode block to be recovered under the hydrogen atmosphere to get the product.

Description

technical field [0001] The invention relates to an anode of a solid oxide fuel cell made of a metal-ceramic functional material, specifically an anode material of a solid oxide fuel cell at a temperature of 500-800°C and an anode preparation method using the same. technical background [0002] As an anode of a hydrocarbon fuel solid oxide fuel cell, it must have the following characteristics: 1. Stability. In a strong reducing atmosphere (oxygen partial pressure of 10 -18 ~10 -20 atm), the anode must have chemical, structural and phase stability. 2. Conductivity. The anode material must have sufficiently high electronic conductivity, and for the porous electrode layer, its electronic conductivity cannot be less than 50S / cm. 3. Catalytic activity. Anode materials must have high catalytic activity for the electrochemical oxidation of hydrocarbon fuel gases. For hydrocarbon fuels, the anode must have a certain ability to inhibit carbon deposition. In addition, it must als...

AI Technical Summary

Problems solved by technology

But under the anode working condition, with LaSrCrFeO 3 For example, the Fe element doped at the B site, due to the reduction of iron in the reducing atmosphere, is uniformly distributed on the substrate in the form of metal crystals, when the amount of these elements doped at the B site exceeds a certain After the value is reached, stress is generated in the lanthanum chromate-based perovskite crystal structure, so that the excess element La at the A site is precipitated in the form of oxide. The precipitated lanthanum oxide phase is insulating and has no catalytic effect on hydrocarbon fuels. Active, the final stable structure formed is: lanthanum oxide phase, Fe and LaSrCrO 3 phase, thereby losing the purpose of doping at the B site, but increasing the insulating phase of lanthanum oxide, thereby reducing the catalytic activity and electrical properties of the anode material