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Double perovskite type intermediate temperature solid oxide fuel cell cathode material and preparation method

A fuel cell cathode and solid oxide technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of high thermal expansion coefficient, achieve low thermal expansion coefficient, reduce sintering temperature, and high oxygen ion conductivity.

Inactive Publication Date: 2017-07-21
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

BACKGROUND OF THE INVENTION The rare earth element Ln in the cathode material is completely replaced by alkaline earth metal elements in the present invention, and the further partial replacement of Co by M solves the problem of excessively high thermal expansion coefficient caused by the cobalt content, further reduces costs and improves chemical stability

Method used

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  • Double perovskite type intermediate temperature solid oxide fuel cell cathode material and preparation method
  • Double perovskite type intermediate temperature solid oxide fuel cell cathode material and preparation method
  • Double perovskite type intermediate temperature solid oxide fuel cell cathode material and preparation method

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Embodiment 1

[0032] Cathodic material Sr for intermediate temperature solid oxidation fuel cells with double perovskite structure prepared by wet chemical method 2 CoFeO 5+δ . The preparation method is as follows:

[0033] 1) Using analytically pure Sr(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O is the raw material, and the required experimental raw materials are weighed according to the stoichiometric ratio.

[0034] 2) With anhydrous ethylene glycol and citric acid (the molar ratio of the two is 1: 1) as complexing agent, take the complexing agent whose molar number is 1~3 times of the sum of all metal cations in the sample, and step 1 The weighed experimental raw materials were dissolved in deionized water together.

[0035] 3) Place the beaker containing the solution in step 2 on a magnetic stirrer and heat and stir until a gel is formed.

[0036] 4) Dry the gel sample obtained in step 3 in an oven at a temperature of 150-300° C. for 2-5 hours to form a xerogel.

[...

Embodiment 2

[0042] The raw material Sr(NO in embodiment 1 3 ) 2 replaced by Ca(NO 3 ) 2 , the rest of the raw materials and complexing agent remain unchanged, and Ca 2 CoFeO 5+δ cathode material. Ca 2 CoFeO 5+δ with La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ Electrolyte materials also have a good chemical match.

Embodiment 3

[0044] The raw material Sr(NO in embodiment 1 3 ) 2 Replaced by Ba(NO 3 ) 2 , the rest of the raw materials and complexing agent remain unchanged, and Ba 2 CoFeO 5+δ cathode material.

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Abstract

The invention discloses a double-perovskite type intermediate temperature solid oxide fuel cell anode material and a preparation method and belongs to the technical field of solid oxide fuel cells. The molecular formula of the anode material is A2Co<1-x>MxFeO<5+delta>, wherein A is Ca, Sr or Ba element, M is Mo, Nb, Ti, Ni, Cu or Al element, and x is greater than 0 and smaller than 1. The preparation method comprises the following steps: required solonetz nitrate and the like as well as a complexing agent are uniformly mixed in an aqueous solution to obtain gel, the gel is oven-dried, the oven-dried gel is calcined at 500-700 DEG C and 800-950 DEG C respectively, and the calcined powder is sintered at 1100-1300 DEG C for 10-20 hours to obtain the corresponding one-phase double-perovskite type anode material. The anode material has the characteristics of low cost, excellent conductivity, low coefficient of thermal expansion and chemistry compatibility with electrolyte material and is the intermediate temperature solid oxide fuel cell anode material having excellent application prospect.

Description

technical field [0001] The invention relates to the technical field of solid oxide fuel cells, in particular to a cathode material of a medium-temperature solid oxide fuel cell with a double perovskite structure and a preparation method thereof. Background technique [0002] A solid oxide fuel cell is an electrochemical power generation device that directly converts chemical energy into electrical energy. It consists of a cathode, an anode, and an electrolyte. As the cathode material of solid oxide fuel cells, the material is required to have high electronic conductivity and suitable ion conductivity in an oxidizing atmosphere, good thermal and chemical stability, and high catalytic activity for oxygen reduction. The traditional high temperature solid oxide fuel cell cathode material is doped LaMnO 3-δ , this cathode material exhibits high performance only at high temperatures (~1000°C), when the temperature drops below 800°C, doped LaMnO 3-δ The polarization resistance of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/86H01M4/88H01M4/8875H01M4/8885H01M2004/8684Y02E60/50
Inventor 贺天民金芳军
Owner JILIN UNIV
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