Coated catalyst, preparation method thereof and application of coated catalyst in fuel cell

A fuel cell and cladding technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high production cost, difficult to store, easy to cause cancer, etc., achieve good corrosion resistance, good catalytic effect, and increase active sites point effect

Inactive Publication Date: 2020-03-17
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, methanol and formaldehyde have obvious toxic effects on the human body, and long-term exposure is easy to cause cancer; reducing agents such as sodium borohydride and hydrazine hydrate are strong, explosive and difficult to store, and the precious metal platinum is used, resulting in higher production costs.

Method used

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  • Coated catalyst, preparation method thereof and application of coated catalyst in fuel cell
  • Coated catalyst, preparation method thereof and application of coated catalyst in fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] (1) Put 1.2g of ferrous chloride and 3.2g of ferric chloride into a 100mL beaker, add them to 40mL of deionized solution, pass through nitrogen protection, and drop into 20mL of a solution containing 4g of NaOH while stirring , stir for 30min;

[0076] (2) The above solution was transposed into a polytetrafluoroethylene-lined stainless steel reactor for hydrothermal carbonization reaction, and the temperature was raised to 160° C. for 24 hours;

[0077] (3) After the liquid is naturally cooled, it is separated by suction filtration, and the solid is repeatedly washed with deionized water and ethanol until the filtrate is clear;

[0078] (4) After drying the washed solid in a vacuum oven at 70°C for 10 hours, place it in a tube furnace and roast it at 400°C for 3 hours to obtain ferric oxide nanoparticles;

[0079] (5) Add ferric iron tetroxide prepared in step (4) into 120mL Tris-HCl pH=8.5 buffer solution, take 2.8g dopamine hydrochloride, ultrasonicate for 30min to o...

Embodiment 2

[0084] (1) Put 1.3g of cobalt chloride into a 100mL beaker, add 40mL of deionized solution to make a solution, drop in 20mL of a solution containing 1.4g of KOH while stirring, and stir for 10min;

[0085] (2) The above solution was transposed into a polytetrafluoroethylene-lined stainless steel reactor for hydrothermal carbonization reaction, and the temperature was raised to 170° C. for 18 hours;

[0086] (3) After the liquid is naturally cooled, it is separated by suction filtration, and the solid is repeatedly washed with deionized water and ethanol until the filtrate is clear;

[0087] (4) After drying the washed solid in a vacuum oven at 90° C. for 8 hours, place it in a tube furnace and roast it at 500° C. for 2 hours to obtain cobalt trioxide nanoparticles;

[0088] (5) Add the cobalt trioxide nanoparticles prepared in step (4) into 100mL Tris-HCl pH=8.5 buffer solution, take 1.9g of dopamine hydrochloride, ultrasonicate for 20min to obtain a uniform dispersion, stir f...

Embodiment 3

[0093] (1) Put 1.8g of nickel nitrate into a 100mL beaker, add it to 40mL of deionized solution, add 0.5g of NH 3 Ammonia solution 10mL, stirred for 20min;

[0094] (2) The above solution was transposed into a polytetrafluoroethylene-lined stainless steel reactor for hydrothermal carbonization reaction, and the temperature was raised to 200° C. for 12 hours;

[0095] (3) After the liquid is naturally cooled, it is separated by suction filtration, and the solid is repeatedly washed with deionized water and ethanol until the filtrate is clear;

[0096] (4) Place the washed solid in a vacuum drying oven at 100°C for 6 hours, then place it in a tube furnace and roast it at 600°C for 2 hours to obtain nickel oxide nanoparticles;

[0097] (5) Add the nickel oxide nanoparticles prepared in step (4) into 150mL Tris-HCl pH=8 buffer solution, take 3.7g of dopamine hydrochloride, ultrasonicate for 40min to obtain a uniform dispersion, stir for 24h, filter with deionized After washing w...

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Abstract

The invention relates to a coated catalyst, a preparation method thereof and an application of the coated catalyst in a fuel cell. The inner layer of the coated catalyst is transition metal oxide nanoparticles, and the outer layer of the coated catalyst is a sulfur element and nitrogen element doped carbon coating layer. The sulfur, nitrogen and carbon doped and coated in the coated catalyst havethe effect of fixing the active sites of the catalyst while increasing the catalytic active sites, and cooperatively promote the oxygen reduction catalyzed reaction with the transition metal oxide nanoparticles, so that the coated catalyst has the better catalytic effect. Meanwhile, a compact oxidation film is easily formed on the surfaces of the transition metal oxide nano-particles after the high temperature treatment, in addition, a coating layer is also arranged on the surface, so that the coated catalyst has the better corrosion resistance. The catalyst with the coated structure has the better catalytic effect and higher corrosion resistance, the performance of the catalyst is superior to that of a commercial catalyst, and the preparation process is safe and environment-friendly, theflow is simple, the cost of used raw materials is lower, so that the coated catalyst has wide application prospect in the field of fuel cell catalysts.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a coated catalyst, its preparation method and its application in fuel cells. Background technique [0002] As a clean and efficient energy source, hydrogen energy is recognized as an effective means to solve the current environmental pollution and energy shortage. Proton exchange membrane fuel cells can efficiently convert the chemical energy in hydrogen into electrical energy, and are one of the best devices for utilizing hydrogen energy. Catalyst, as the key material of proton exchange membrane fuel cell, is the key factor restricting its performance and cost. Platinum-based materials are currently the most commonly used cathode redox reaction catalysts in fuel cells. However, platinum resources are limited and expensive, so the development of non-precious metal catalysts to reduce costs is of great significance for the commercialization of proton exchange memb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90
CPCH01M4/8663H01M4/9016Y02E60/50
Inventor 唐柳于力娜朱雅男张克金朱云杨帅
Owner FAW JIEFANG AUTOMOTIVE CO
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