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A Novel Proton Blocking Composite Cathode Material and Its Preparation Method and Application

A composite cathode and proton technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems that limit the practical application of Co-based perovskite cathode materials, poor thermal stability of cathode materials, matching of thermal expansion coefficients, etc., and achieve excellent electrical performance. Effects of comprehensive chemical properties, high power density, and low polarization resistance

Inactive Publication Date: 2021-06-22
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Co is volatile at high temperature, resulting in poor thermal stability of cathode materials, and the thermal expansion coefficient (TEC) of cathode materials containing Co is usually 15×10 -6 K -1 Above, higher than the TEC of BZCY electrolyte (14×10 -6 K -1 ), there is a certain thermal expansion coefficient matching problem
In addition, Co is expensive (~400,000 / ton), these factors limit the practical application of Co-based perovskite cathode materials

Method used

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  • A Novel Proton Blocking Composite Cathode Material and Its Preparation Method and Application
  • A Novel Proton Blocking Composite Cathode Material and Its Preparation Method and Application
  • A Novel Proton Blocking Composite Cathode Material and Its Preparation Method and Application

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Embodiment 1

[0028] This embodiment is a novel proton blocking composite cathode material, the specific molecular formula is PrBa 0.5 Sr 0.5 Cu 2 O 5-δ -Ce 0.8 Sm 0.2 O 2-δ , x=0.3;

[0029] The specific preparation method of the above-mentioned proton blocking composite cathode material is as follows:

[0030] S1: put Pr 6 O 11 Dissolve in an appropriate amount of concentrated nitric acid to make a nitrate solution, and add Sr(NO) according to the stoichiometric ratio of metal ions while stirring. 3 ) 2 ·2H 2 O, Ba (NO 3 ) 2 , Cu(NO 3 ) 2 ·6H 2 O, to obtain a nitric acid solution containing mixed metal cations; according to the ratio of the total molar ratio of citric acid and metal cations to 1.5:1, add citric acid to the first acid solution containing mixed metal cations, add ammonia water to adjust pH to neutrality, and use A constant temperature heating magnetic stirrer was heated in a water bath at 80 °C, and the wet gel was obtained by complexation for 6 hours; the wet...

Embodiment 2

[0034] This embodiment is a novel proton blocking composite cathode material, and the specific molecular formula is:

[0035] PrBa 0.5 Sr 0.5 Cu 2 O 5-δ -Ce 0.8 Sm 0.2 O 2-δ , x=0.4; the specific preparation method of the proton blocking composite cathode material is the same as that in Example 1, the only difference is: in S3, the PBSC powder obtained by S1 and the SDC powder obtained by S2 are in a mass ratio of 6:4 The proportion of grinding and mixing.

Embodiment 3

[0037] A novel proton blocking composite cathode material of the present embodiment, the specific molecular formula is:

[0038] PrBa 0.5 Sr 0.5 Cu 2 O 5-δ -Ce 0.8 Sm 0.2 O 2-δ , x=0.5, the specific preparation method of the proton blocking composite cathode material is the same as that in Example 1, the only difference is: in S3, the PBSC powder obtained by S1 and the SDC powder obtained by S2 are in a mass ratio of 5:5 The proportion of grinding and mixing.

[0039] We tested the performance of the new proton blocking composite cathode material prepared in Example 1, figure 1 X-ray diffraction (XRD) of the cathode layer of the PBSC-SDC sample prepared in Example 1 after being treated at 1000° C. for 3h. It can be seen that after the treatment at 1000 °C, there is no obvious impurity peak, which is still the diffraction peak of PBSC and SDC. It shows that at 1000℃, PBSC and SDC still have good stability and no chemical reaction occurs.

[0040] figure 2 is the the...

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Abstract

The invention discloses a novel proton blocking composite cathode material and its preparation method and application. The molecular formula of the cathode material is (1‑x)PrBa 0.5 Sr 0.5 Cu 2 o 5‑δ ‑xCe 0.8 SM 0.2 o 2‑δ , wherein, x=0.1~0.5. The novel proton-blocking composite cathode material provided by the present invention can be used as a cathode material for a fuel cell. Due to the use of the PBSC-SDC composite cathode material, the prepared single cell not only has a higher open circuit voltage and a lower polarization resistance, Can output higher maximum power density. It also has good thermal matching, which helps to improve the thermal stability of the single cell.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a novel proton blocking composite cathode material used in proton conductor oxide fuel cells and a synthesis method thereof. Background technique [0002] As a chemical device that directly converts chemical energy into electrical energy, solid oxide fuel cells are an effective solution to energy and environmental problems. In a proton conductor solid oxide fuel cell, the fuel gas is oxidized to protons at the anode, oxygen is adsorbed, decomposed and reduced to oxygen ions at the cathode, and the protons are conducted through the electrolyte to the cathode, and react with the oxygen ions at the cathode to form water. Therefore, as the reaction site of the fuel, the cathode has an important influence on the performance of the battery. It is of great significance to explore new cathode materials and reduce the polarization resistance for the development of high-perf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/90
CPCH01M4/8647H01M4/9025Y02E60/50
Inventor 蔡彬陈雷行张宗镇宋腾飞李启华苏金瑞何豪
Owner ZHENGZHOU UNIV
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