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Preparation method for oxygen-reduction electrocatalyst taking aramid amide as main precursor

A technology of aramid and electrocatalyst, which is applied in circuits, electrical components, battery electrodes, etc., can solve the problems of high cost and high price of fuel cells, and achieve the effects of easy mass production, low cost, and guaranteed stability

Pending Publication Date: 2019-11-12
GUANGXI NORMAL UNIV
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Problems solved by technology

[0005] Aiming at the problem that a large amount of platinum catalyst must be used in the existing oxygen reduction reaction, which leads to the high cost and high price of fuel cells and other products, the present invention proposes a method for preparing an oxygen reduction electrocatalyst using aramid as the main precursor. The oxygen reduction electrocatalyst prepared by the method has excellent performance and low cost, and can replace platinum catalysts for the production of fuel cells and other fields

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  • Preparation method for oxygen-reduction electrocatalyst taking aramid amide as main precursor
  • Preparation method for oxygen-reduction electrocatalyst taking aramid amide as main precursor
  • Preparation method for oxygen-reduction electrocatalyst taking aramid amide as main precursor

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preparation example Construction

[0038] The preparation method of the oxygen reduction electrocatalyst comprises the following steps:

[0039] (1) Dissolution: Dissolve carbon black in deionized water by wet sieving (that is, grinding through a 100-mesh sieve after adding water), ultrasonication for a long time, stirring and dispersing evenly, and then storing at low temperature.

[0040] The proportioning of described carbon black and deionized water can be 2g:420mL, and wherein carbon black is calculated by mass, and deionized water is calculated by volume; The time of described ultrasonic can be 1~20h; The temperature of described preservation can be 0 ~10°C.

[0041] (2) Coating polymer: add hydrochloric acid to the carbon black solution stored at 0-10°C, and 5-50 mL of 36% concentrated hydrochloric acid may be added. The amount of m-phenylenediamine added can be 1-50 g; the temperature under the low temperature condition can be 0-10° C.; the phthalic acid is a phthalic acid solution cooled with ice wate...

Embodiment 1

[0054] (1) Carbon black sieving: First, 2 g of Ketjenblack EC600JD carbon black (KJ600 for short) was sieved, dissolved in 400 mL of deionized water, and ultrasonicated for 8 hours, so that the carbon black was evenly dispersed in the water. Store at a low temperature of 0-10°C for later use.

[0055] (2) Coating polymer: add 100mL of concentrated hydrochloric acid with a concentration of 36% by mass to the carbon black solution, then add 10g of p-phenylenediamine (i.e. nitrogen source), and mechanically stir for 3 hours at a low temperature of 0-10°C to disperse the sample uniform. The terephthalic acid solution (10 g of terephthalic acid content) was previously cooled with ice water, and slowly added dropwise. The carbon black solution (KJ600-(PmPDA+pPA)) wrapped with the polymer was obtained by in-situ polymerization under low temperature condition of 0-10°C for 12 hours.

[0056] (3) Water washing: directly filter the carbon black solution wrapped in the polymer in situ,...

Embodiment 2

[0063] (1) Carbon black sieving: first sieve 2g of Ketjenblack EC300J carbon black, dissolve it in 400mL of deionized water, ultrasonicate for 8 hours, and then mechanically stir for 1 hour to further disperse the carbon black in the water evenly. Store at a low temperature of 0-10°C for later use.

[0064] (2) Encapsulating the polymer: Add 70 mL of 36% concentrated hydrochloric acid to the carbon black solution, then add 20 g of p-phenylenediamine (ie nitrogen source), and mechanically stir for 3 hours at a low temperature of 0-10°C to disperse the sample evenly. The terephthalic acid solution (20 g of terephthalic acid content) was pre-cooled with ice water and slowly added dropwise. Stirring at a low temperature of 0-10°C for 12 hours, in-situ polymerization to obtain a conductive carbon black solution coated with aramid polymer in-situ.

[0065] (3) Water washing: directly filter the conductive carbon black solution coated with the polymer in situ, wash it several times ...

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Abstract

The invention discloses a preparation method for an oxygen-reduction electrocatalyst taking aramid amide as a main precursor. The oxygen-reduction electrocatalyst is prepared from the following raw materials based on parts by weight: 5-20 parts of phenylenediamine, 5-20 parts of phthalic acid, 1-5 parts of metal source, 5-40 parts of carbon black and 8-20 parts of inorganic acid. The preparation method comprises the steps of performing ultrasonic dissolving on the carbon black, wrapping the polymer, washing, doping a metal source, performing initial thermal treatment, pickling and performing secondary thermal treatment. The oxygen-reduction electrocatalyst prepared by the method does not contain precious metal or contains low-content precious metal, a low-cost nitrogen-containing compound(aramid amide precursor is used as a nitrogen source) is employed to substitute a high-cost macrocyclic compound such as porphyrin and phthalocyanine, the oxygen-reduction electrocatalyst is low in cost, and yield is easy. By a mode wrapping the carbon black with an in-situ polymer, uniform distribution of active sites in a carbon black surface is facilitated, the active site density is improved,moreover, the yield of oxygen-reduction by-product H2O2 is reduced, the stability of the catalyst is ensured, and excellent performance is achieved.

Description

technical field [0001] The invention relates to the preparation of an oxygen-reducing electrocatalyst, in particular to a method for preparing an oxygen-reducing electrocatalyst with aramid as the main precursor. Background technique [0002] The amide corresponding to polyphenylene diamine and phthalic acid is equivalent to aramid. The full name of aramid is "poly-p-phenylene terephthalamide", which is Aramid fiber in English (DuPont's trade name is Kevlar). It is a new type of high-tech synthetic fiber with ultra-high strength, high modulus and durability. High temperature, acid and alkali resistance, light weight and other excellent properties, its strength is 5 to 6 times that of steel wire, its modulus is 2 to 3 times that of steel wire or glass fiber, its toughness is 2 times that of steel wire, and its weight is only 1 / of that of steel wire. About 5, at a temperature of 560 ° C, it will not decompose or melt. It has good insulation and anti-aging performance, and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86H01M4/88
CPCH01M4/8652H01M4/8882H01M4/9008H01M2004/8684Y02E60/50
Inventor 樊友军汪强
Owner GUANGXI NORMAL UNIV
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