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Novel proton blocking composite cathode material and preparation method and application thereof

A composite cathode and cathode material technology, applied in battery electrodes, electrical components, circuits, 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, low polarization resistance, and high open circuit voltage

Inactive Publication Date: 2018-07-06
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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  • Novel proton blocking composite cathode material and preparation method and application thereof
  • Novel proton blocking composite cathode material and preparation method and application thereof
  • Novel proton blocking composite cathode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In this embodiment, 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 3 ) 2 2H 2 O, Ba(NO 3 ) 2 , Cu(NO 3 ) 2 ·6H 2 0, obtain the nitric acid solution that contains mixed metal cation; According to the ratio of 1.5:1 of citric acid and metal cation sum molar ratio, add citric acid in the first acid solution that contains mixed metal cation, add ammoniacal liquor to adjust pH to neutrality, utilize Heating the magnetic stirrer at a constant temperature in a water bath at 80°C, and complexing for 6 hours to obtain a wet gel; put the wet gel on an electric furnace to continue heating and drying to form a xerogel, and th...

Embodiment 2

[0034] In this embodiment, a novel proton blocking composite cathode material, 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 in Example 1, the only difference is that in S3, the PBSC powder obtained in S1 and the SDC powder obtained in S2 are used in a mass ratio of 6:4 Grind and mix well.

Embodiment 3

[0037] A kind of novel proton blocking composite cathode material of the present embodiment, concrete 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 of Example 1, the only difference is that in S3, the PBSC powder obtained in S1 and the SDC powder obtained in S2 are used in a mass ratio of 5:5 Grind and mix well.

[0039] We perform a performance test on the novel 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 for Example 1 after being treated at 1000° C. for 3 h. It can be seen that after treatment at 1000°C, no obvious heterophase peaks appear, and they are still the diffraction peaks 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...

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Abstract

The invention discloses a novel proton blocking composite cathode material and a preparation method and application thereof. The cathode material adopts a molecular formula of (1-x)PrBa0.5Sr0.5Cu2O5-delta-xCe0.8Sm0.2O2-delta, wherein x is 0.1-0.5. The novel proton blocking composite cathode material provided by the invention can be used as the cathode material for a fuel battery; due to use of a PBSC-SDC composite cathode material, a prepared single battery not only has relatively high open circuit voltage and relatively low polarization resistance, so that relatively high maximum power density can be outputted; the prepared single battery also has good thermal matching, so that improvement on the thermal stability of the single battery is facilitated.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a novel proton blocking composite cathode material applied to a proton conductor oxide fuel cell 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, fuel gas is oxidized to protons at the anode, oxygen is adsorbed at the cathode, decomposed and reduced to oxygen ions, the protons are conducted through the electrolyte to the cathode, and react with the oxygen ions at the cathode to form water. Therefore, the cathode, as the fuel reaction site, has an important impact 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-perfo...

Claims

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Application Information

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Patent Type & Authority Applications(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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