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Nano-composite fiber cathode material of solid oxide fuel cell and method for preparing the same

A nanocomposite fiber, solid oxide technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of high electrode polarization resistance and overpotential, poor chemical stability, etc.

Inactive Publication Date: 2012-08-22
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of poor chemical stability, high electrode polarization resistance and high overpotential of existing cathode materials, and provides nanocomposite fiber cathode materials for solid oxide fuel cells and a preparation method thereof

Method used

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  • Nano-composite fiber cathode material of solid oxide fuel cell and method for preparing the same
  • Nano-composite fiber cathode material of solid oxide fuel cell and method for preparing the same
  • Nano-composite fiber cathode material of solid oxide fuel cell and method for preparing the same

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specific Embodiment approach 1

[0010] Specific Embodiment 1: In this embodiment, the nanocomposite fiber cathode material of the solid oxide fuel cell is made of the mixed conductor cathode material Ln 2-x m x NiO 4 and electronic conductor Ag, the chemical formula is Ln 2-x m x NiO 4 -yAg; wherein y is the mass percentage content of Ag in the composite fiber cathode material, 1%≤y≤10%; the mixed conductor cathode material Ln 2-x m x NiO 4 Among them, Ln represents a rare earth element, which is La, Pr, Sm or Eu, and M represents an alkali metal element, which is Ca, Sr or Ba, where 0.1≤x≤1.0.

specific Embodiment approach 2

[0011] Specific embodiment two: the preparation method of the solid oxide fuel cell nanocomposite fiber cathode material described in specific embodiment one, is carried out according to the following steps: 1. After dissolving polyvinylpyrrolidone in absolute ethanol, at 20~80r / min Stir at a high speed for 5-10 hours, then stand still for 6-12 hours to obtain a polyvinylpyrrolidone ethanol solution with a mass concentration of 10%-20%; 3 Dissolve in 3-10mL of absolute ethanol, then stir at a speed of 20-80r / min for 1-3 hours, and then stand still for 1-3 hours to obtain yellow AgNO 3 Sol; 3. According to the chemical formula Ln 2-x m x NiO 4 , weigh Ln(NO 3 ) 3 , M(NO 3 ) 2 and Ni(NO 3 ) 2 , then Ln(NO 3 ) 3 , M(NO 3 ) 2 and Ni(NO 3 ) 2Dissolve in deionized water to obtain a nitrate solution; 4. The AgNO obtained in step 2 3 The sol is mixed with the nitrate solution obtained in step 3 to obtain a mixed solution, and the mixed solution is mixed with the polyvin...

specific Embodiment approach 3

[0014] Embodiment 3: This embodiment is different from Embodiment 2 in that: in step 1, an ethanol solution of polyvinylpyrrolidone with a mass concentration of 12% to 18% is obtained. Others are the same as in the second embodiment.

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Abstract

The invention relates to a method for preparing a nano-composite fiber cathode material of a solid oxide fuel cell, relating to the method for preparing the nano-composite fiber cathode material of the solid oxide fuel cell, and aiming to solve the problems of bad chemical stability, and high electrode polarization resistance and overpotential of the existing cathode material. The nano-composite fiber cathode material is prepared from a mixed conductor cathode material Ln2-xMxNiO4 and an electronic conductor Ag. The method comprises the following steps of: preparing a polyvinyl pyrrolidone ethanol solution; dissolving polyvinyl pyrrolidone and AgNO3 in ethanol, thereby obtaining AgNO3 sol; preparing a nitrate solution; mixing the AgNO3 sol with the nitrate solution, adding the mixed solution to the polyvinyl pyrrolidone ethanol solution, and standing the mixed solution after stirring, thereby obtaining composite fiber spinning sol; spinning the composite fiber spinning sol to obtain precursor composite fibers; and drying and sintering the precursor composite fibers, thereby obtaining the material. The diameter of the composite fiber cathode material is about 80 nm; and the nano-composite fiber cathode material is low in polarization resistance and used for the fuel cell field.

Description

technical field [0001] The invention relates to a solid oxide fuel cell nanocomposite fiber cathode material and a preparation method thereof. Background technique [0002] As a new type of energy conversion device, medium temperature (500-800℃) solid oxide fuel cell is attracting more and more attention from various countries because of its advantages of high efficiency and cleanliness. Traditional solid oxide fuel cells suffer from poor stability and short lifetime due to their high operating temperature (around 1000°C). The reduction of the operating temperature of the battery will cause a rapid decline in the performance of the electrode, and the performance of the cathode material directly affects the quality of the entire battery system. [0003] The existing cathode materials of solid oxide fuel cells have the problems of poor chemical stability, high electrode polarization resistance and high overpotential. Contents of the invention [0004] The invention aims to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88B82Y30/00B82Y40/00
CPCY02E60/50
Inventor 李强王海龙赵辉霍丽华高山
Owner HEILONGJIANG UNIV