Preparation of cobalt-based cathode material with low thermal expansion coefficient for solid oxide fuel cell and application of cobalt-based cathode material

Abstract

The invention discloses a cathode material BaNbyZrxCo1-x-yO3-delta with an excellent thermal expansion coefficient for a solid oxide fuel cell. By co-doping Nb2O5 with ZrO2 at Co site of BaCoO3-deltato reduce the thermal expansion coefficient of a BaCoO3-delta base cathode material, a small TEC value (smaller than 15x10<-6>K<-1>) can be obtained and electrochemical properties of the material canbe further improved; a molecular formula is BaNbyZrxCo(1-x-y)O(3-delta), wherein delta represents excess oxygen content or oxygen deficiency content, and is greater than or equal to -1 and smaller than or equal to 1; x represents the doping amount of the ZrO2 and is greater than or equal to 0 and smaller than or equal to 0.5; y represents the doping amount of the Nb2O5 and is greater than or equalto 0 and smaller than or equal to 0.5. The BaNbyZrxCo(1-x-y)O(3-delta) cathode material disclosed by the invention, compared with traditional Co-based materials, has the advantage that the thermal expansion coefficient is greatly reduced; in addition, the BaNbyZrxCo(1-x-y)O(3-delta) cathode material has good chemical compatibility with GDC, good oxygen reduction catalytic activity in the temperature range of 500 to 850 DEG C and suitability for solid oxide fuel cell cathode materials at medium and low temperature.

Description

technical field [0001] The present invention relates to a kind of preparation method and application of cathode material of solid oxide fuel cell, be specifically related to a kind of co-doped Nb at B site 2 o 5 and ZrO 2 to reduce BaCoO 3-δ Cathode material thermal expansion coefficient and its preparation method and application. Background technique [0002] A fuel cell is a power generation device that can directly convert the chemical energy of fuel into electrical energy. It is an innovative idea in addition to thermal power generation, hydropower generation and solar power generation. Among many types of fuel cells, Solid Oxide Fuel Cell (SOFC) has obvious advantages: it does not have high requirements for fuel, and hydrogen, coal gas and various hydrocarbon compounds can be used as fuel; The anode, electrolyte, cathode and connecting body of the entire battery are all solid, unlike other types of batteries that require leak-proof and anti-corrosion operations; the...

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Problems solved by technology

Wei et al. in Thermal and Electrical Properties of NewCathode Material Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ for Solid Oxide Fuel Cells (intermediate temperature solid oxide fuel cell cathode material Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ The thermal and electrical properties of Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ (BSCF) The average TEC at 30~1000℃ is 21.6×10 -6 K -1 , a poor match to the electrolyte GDC

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