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a 2 mn 2-x w x o 6 Composite catalytic material of perovskite oxide and nitrogen-doped carbon, preparation method and application thereof

A technology of perovskite oxides and catalytic materials, which is applied in fuel cell-type half-cells and primary battery-type half-cells, structural parts, electrical components, etc. In order to achieve the effect of improving the reaction efficiency and the overall performance of the battery, good conductivity and dispersibility, etc.

Active Publication Date: 2022-07-12
SHENZHEN AUTOMOTIVE RES INST BEIJING INST OF TECH (SHENZHEN RES INST OF NAT ENG LAB FOR ELECTRIC VEHICLES)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has the disadvantages of low specific surface area and poor electrical conductivity, and if most perovskite oxides are in contact with carbon at high temperature, the structure of perovskite oxides is easily decomposed due to carbothermal reduction reaction. Therefore, most perovskites cannot exist stably after in situ complexing with carbon at high temperature, and the resulting secondary structures are unfavorable for the catalytic activity and stability of the oxygen reduction reaction.
In the current technology, when perovskite oxides are used to directly prepare metal battery cathode catalytic materials, their conductivity and activity have not achieved the desired effect; and when the perovskite oxides in the prior art are prepared into electrodes or batteries, neither Carbon black needs to be physically added during the test, and the operation steps are cumbersome

Method used

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  • a <sub>2</sub> mn <sub>2-x</sub> w <sub>x</sub> o <sub>6</sub> Composite catalytic material of perovskite oxide and nitrogen-doped carbon, preparation method and application thereof
  • a <sub>2</sub> mn <sub>2-x</sub> w <sub>x</sub> o <sub>6</sub> Composite catalytic material of perovskite oxide and nitrogen-doped carbon, preparation method and application thereof
  • a <sub>2</sub> mn <sub>2-x</sub> w <sub>x</sub> o <sub>6</sub> Composite catalytic material of perovskite oxide and nitrogen-doped carbon, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1.1 Preparation of Ca 2 Mn 1.2 W 0.8 O 6 Perovskite Oxides:

[0026] Calcium nitrate, manganese acetate tetrahydrate, and ammonium metatungstate are dissolved in deionized water in a stoichiometric ratio, and then citric acid monohydrate is added to the above-mentioned metal salt solution, wherein citric acid monohydrate and metal ions (including calcium ions, The molar ratio of manganese ion and tungsten ion) is 1.5:1, then the above solution is heated and stirred continuously in a constant temperature water bath of 80 ° C until a gel is formed, and the obtained gel is dried in a blast drying oven at 140 ° C for 12 hours, The temperature is then raised to 240° C. for 10 hours to obtain a catalyst material precursor. The catalytic material precursor was calcined in a muffle furnace at 1000 °C for 8 hours, and then transferred to a tube furnace and calcined at 1050 °C for 10 hours in a high-purity mixture of hydrogen / nitrogen to obtain Ca 2 Mn 1.2 W 0.8 O 6 Perov...

Embodiment 2

[0036] 2.1 Preparation of Ba 1.6 Sr0.4 MnWO 6 Perovskite Oxides:

[0037] Dissolve barium nitrate, strontium nitrate, manganese acetate tetrahydrate, and ammonium metatungstate in deionized water at a stoichiometric ratio, and then add citric acid monohydrate to the above metal salt solution, wherein citric acid monohydrate and metal ions (including The molar ratio of barium ion, strontium ion, manganese ion and tungsten ion) is 2:1, and then the above solution is continuously stirred and heated in a 100 ° C constant temperature water bath until a gel is formed, and the resulting gel is dried in a blast drying oven at 90 ° C. After drying at low temperature for 24 hours, the temperature was raised to 300° C. for 6 hours to obtain a catalyst material precursor. The catalytic material precursor was calcined in a muffle furnace at 800 °C for 12 hours, then transferred to a tube furnace and calcined in high-purity hydrogen at 1100 °C for 15 hours to obtain Ba 1.6 Sr 0.4 MnWO ...

Embodiment 3

[0047] 3.1 Preparation of Sr 2 MnWO 6 Perovskite Oxides:

[0048] Strontium acetate, manganese acetate tetrahydrate, and ammonium metatungstate are dissolved in deionized water according to the stoichiometric ratio, and then citric acid monohydrate is added to the above-mentioned metal salt solution, wherein, citric acid monohydrate and metal ions (including strontium ions, The molar ratio of manganese ion and tungsten ion) is 1: 1, then the above solution is continuously stirred and heated in a constant temperature water bath at 80 ° C until a gel is formed, and the obtained gel is dried in a blast drying oven at 100 ° C for 12 hours, and then The temperature was raised to 250° C. for 6 hours to obtain a catalyst material precursor. The catalyst material precursor was calcined in a muffle furnace at 900 °C for 12 hours, and then transferred to a tube furnace and calcined at 1000 °C for 24 hours in a high-purity mixture of hydrogen / nitrogen to obtain Sr 2 MnWO 6 Perovskite...

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Abstract

This application provides A 2 Mn 2‑x W x O 6 Composite catalytic material of perovskite oxide and nitrogen-doped carbon, preparation method and application thereof, wherein A in the composite catalytic material 2 Mn 2‑x W x O 6 Perovskite oxide, A is selected from one or more atoms of Ca, Sr and Ba, x is a mole fraction, and 0<x≦1. The composite catalytic material, the hydrophobic gas permeable layer, and the current collector are prepared into a battery cathode, which can be used in a metal-air battery to improve the output power of the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a kind of A 2 Mn 2-x W x O 6 Composite catalytic material of perovskite oxide and nitrogen-doped carbon, and preparation method and application thereof. Background technique [0002] The reaction efficiency of the metal-air battery cathode oxygen reduction reaction is a key factor affecting the overall output power of the metal-air battery. Perovskite oxides have attracted much attention as a class of cathode catalytic materials for metal-air batteries with high intrinsic activity, low cost, and excellent oxygen reduction reaction performance. However, it has the disadvantages of low specific surface area and poor electrical conductivity at the same time, and if most perovskite oxides are in contact with carbon at high temperature, the structure of perovskite oxides is easily decomposed due to the carbothermic reduction reaction. Therefore, most perovskites cannot exist st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/96H01M4/88H01M12/06
CPCH01M4/9016H01M4/96H01M4/90H01M4/8825H01M12/06Y02E60/50
Inventor 李凤姣王文伟张哲鸣李瑞宇崔彦辉
Owner SHENZHEN AUTOMOTIVE RES INST BEIJING INST OF TECH (SHENZHEN RES INST OF NAT ENG LAB FOR ELECTRIC VEHICLES)
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