Intermediate temperature solid oxide fuel cell cathode material with perovskite structure and preparation method thereof

A fuel cell cathode and solid oxide technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of difficult to meet the requirements of cathode materials, high mixed conductivity, low polarization overpotential, etc., and achieve good chemical stability , good thermal stability and close thermal expansion coefficient

Inactive Publication Date: 2012-12-26
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem that the existing solid oxide battery cathode materials cannot have the following characteristics at the same time under medium temperature working conditions: small polarization resistance, low polarization overpotential, high mixed conductivity, good oxygen permeability, and thermal stability. And chemical stability performance is good, thus cause the problem that it is difficult to meet the requirements of the intermediate temperature solid oxide fuel cell on the cathode material, the invention provides a kind of perovskite structure intermediate temperature solid oxide fuel cell cathode material and its preparation method

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  • Intermediate temperature solid oxide fuel cell cathode material with perovskite structure and preparation method thereof
  • Intermediate temperature solid oxide fuel cell cathode material with perovskite structure and preparation method thereof
  • Intermediate temperature solid oxide fuel cell cathode material with perovskite structure and preparation method thereof

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specific Embodiment approach 1

[0019] Specific implementation mode 1: The cathode material of the intermediate temperature solid oxide fuel cell with a perovskite structure according to this embodiment is characterized in that the general composition formula of the cathode material for an intermediate temperature solid oxide fuel cell with a perovskite structure is AFe 1-x m x o 3 ; Wherein, A is Ca, Sr or Ba, M is Cu, Co or Ni, 0.1

specific Embodiment approach 2

[0020] Specific embodiment 2: The method for preparing the cathode material of the intermediate temperature solid oxide fuel cell with the perovskite structure in this embodiment is characterized in that the preparation method of the cathode material for the intermediate temperature solid oxide fuel cell with the perovskite structure is carried out in the following steps:

[0021] 1. According to the chemical formula AFe 1-x m x o 3 , according to the stoichiometric ratio, weigh the carbonate of analytically pure element A and the analytically pure Fe 2 o 3 And analytically pure nitrate of element M; wherein, A is Ca, Sr or Ba, M is Cu, Co or Ni, 0.1

[0022] Two, the carbonate and Fe of element A weighed in step one 2 o 3 Added to HNO with a concentration of 1mol / L 3 , so that the carbonate of element A and Fe 2 o 3 Completely dissolve, then add the nitrate of the element M weighed in step 1, stir evenly to obtain a nitrate solution;

[0023] 3. The molar rati...

specific Embodiment approach 3

[0026] Specific embodiment 3: The difference between this embodiment and specific embodiment 2 is that in step 3, the molar ratio of total metal ions in the nitrate solution to glycine is 1:2, and glycine is weighed. Other steps and parameters are the same as in the second embodiment.

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Abstract

An intermediate temperature solid oxide fuel cell cathode material with a perovskite structure and a preparation method thereof relate to a cell cathode material and a preparation method thereof. The invention solves the problem that under the intermediate-temperature working conditions, existing cathode materials difficultly satisfy the requirements of the intermediate temperature solid oxide fuel cell for the cathode material because existing materials do not have the characteristics of low polarization resistance and overpotential, and high mixed conductivity, oxygen permeability, thermal stability and chemical stability. The intermediate temperature solid oxide fuel cell cathode material with the perovskite structure disclosed by the invention has the general formula of AFe1-xMxO3, wherein A is Ca, Sr or Ba, M is Cu, Co or Ni, x is greater than 0.1 and smaller than 1.0. The preparation method comprises the following steps: preparing nitrate and glycine mixed liquor, heating the mixed liquor until spontaneous combustion, and then sintering to obtain the AFe1-xMxO3. The AFe1-xMxO3 prepared by the invention has good performance. The cathode material and the method disclosed by the invention are suitable for the intermediate temperature solid oxide fuel cell cathode material and the preparation thereof.

Description

technical field [0001] The invention relates to a battery cathode material and a preparation method thereof. Background technique [0002] As a new type of energy conversion device, solid oxide fuel cell has been paid attention to by various countries because of its advantages of high efficiency and environmental protection. The operating temperature of traditional solid oxide fuel cells is usually around 1000 °C. High operating temperatures will cause poor thermal stability of solid oxide fuel cells, that is, poor matching of thermal expansion coefficients with solid electrolytes. However, if the operating temperature is lowered, it will lead to an increase in the electrode polarization resistance and overpotential of the solid oxide fuel cell, which will affect the performance of the cell. Existing high temperature solid oxide battery cathode material La l-x Sr x MnO 3 (LSM), when the operating temperature is lower than 800 °C, there will be problems of increasing pola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 李强赵辉霍丽华高山
Owner HEILONGJIANG UNIV
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