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M/N-C catalyst and preparation and application thereof

A catalyst and oxidant technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of reducing the catalytic activity of the catalyst per unit mass and failing to form Co-N The problems of bit structure and poor conductivity of PPy can achieve the effects of enhanced conductivity, improved stability and strong conductivity.

Active Publication Date: 2012-05-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although PPy is a conductive polymer, the conductivity of undoped PPy is poor
In order to improve the conductivity of the catalyst, the author uses PPy and carbon materials as composite supports, but PPy and carbon supports are only physically mixed, and the Co supported on the carbon supports cannot interact with PPy and cannot form a Co-N active site structure, resulting in Co Coordination with N on PPy is inefficient, which reduces the catalytic activity per unit mass of the catalyst

Method used

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  • M/N-C catalyst and preparation and application thereof
  • M/N-C catalyst and preparation and application thereof
  • M/N-C catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, at a concentration of 0.8mol·L -1 Add pyrrole monomer in the cetyltrimethylammonium bromide (CTAB) ethylene glycol solution, the concentration of pyrrole monomer is 1mol L -1 , stirred at 0°C for 1 hour, then added the oxidant ferric chloride (FeCl 3 ), stirred at 0° C. for 2 hours to polymerize the pyrrole monomer to generate polypyrrole (PPy), and the molar ratio of ferric chloride to pyrrole monomer was 0.5:1;

[0030] Immerse the synthesized PPy into 100% electro-alcohol aqueous solution to remove residual surfactants and oxidants, then filter, wash, and dry under vacuum at 75°C for 3 hours;

[0031] Cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) added to a concentration of 2molL -1 In the ethylene glycol solution B of NaOH, the molar concentration of cobalt nitrate is 0.02mol L -1 , stirred at 180°C for 3 hours, then added the required amount of PPy, cobalt accounted for 30% of the total mass of cobalt and PPy, continued to stir for 2 hours, then added 40 times ...

Embodiment 2

[0035] First, at a concentration of 0.8mol·L -1 Add pyrrole monomer in the cetyltrimethylammonium bromide (CTAB) ethylene glycol solution, the concentration of pyrrole monomer is 1mol L -1 , stirred at 0°C for 1 hour, then added the oxidant ferric chloride (FeCl 3), stirred at 0° C. for 2 hours to polymerize the pyrrole monomer to generate polypyrrole (PPy), and the molar ratio of ferric chloride to pyrrole monomer was 0.5:1;

[0036] Immersing the synthesized PPy into 100% by mass methanol aqueous solution to remove residual surfactants and oxidants, then filtering, washing, and drying under vacuum at 75°C for 3 hours;

[0037] Cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) added to a concentration of 2molL -1 In the ethylene glycol solution of NaOH, the molar concentration of cobalt nitrate is 0.02mol L -1 , then stirred at 180°C for 3 hours, then added the required amount of PPy, cobalt accounted for 30% of the total mass of cobalt and PPy, continued to stir for 2 hours, then a...

Embodiment 3

[0041] First, at a concentration of 0.8mol·L -1 Add pyrrole monomer in the cetyltrimethylammonium bromide (CTAB) ethylene glycol solution, the concentration of pyrrole monomer is 1mol L -1 , stirred at 0°C for 1 hour, then added the oxidant ferric chloride (FeCl 3 ), stirred at 20°C for 2 hours to polymerize the pyrrole monomer to generate polypyrrole (PPy), and the molar ratio of ferric chloride to pyrrole monomer was 0.5:1;

[0042] Immersing the synthesized PPy into 100% by mass methanol aqueous solution to remove residual surfactants and oxidants, then filtering, washing, and drying under vacuum at 75°C for 3 hours;

[0043] Cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) added to a concentration of 2molL -1 In the ethylene glycol solution of NaOH, the molar concentration of cobalt nitrate is 0.02mol L -1 , then stirred at 180°C for 3 hours, then added the required amount of PPy, cobalt accounted for 30% of the total mass of cobalt and PPy, continued to stir for 2 hours, then a...

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Abstract

The invention relates to a non-platinum catalyst, in particular to an oxygen reduction catalyst for a proton exchange membrane fuel cell and preparation and application thereof. The catalyst can be prepared by the following steps of: (1) synthesizing polypyrrole (PPy); and (2) preparing an M / N-C catalyst, wherein the M / N-C catalyst can be taken as a cathode oxygen reduction catalyst for the proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to a non-platinum catalyst, in particular to an oxygen reduction catalyst used in a proton exchange membrane fuel cell and its preparation and application. Background technique [0002] Fuel cells have the advantages of high energy conversion efficiency, no pollution, no noise, etc., and have attracted people's attention in recent years. In addition to the general characteristics of other fuel cells, proton exchange membrane fuel cells have the advantages of high specific power density and specific energy, rapid startup at room temperature, no electrolyte loss, and long service life. etc. have broad application prospects. [0003] Catalyst is one of the key materials of proton exchange membrane fuel cell. At present, the widely used catalysts are supported or unsupported catalysts with the noble metal Pt as the main active component, but their limited resources and high cost limit the development of proton exchange membrane fuel...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J23/75B01J23/745B01J23/755H01M4/90
CPCY02E60/50
Inventor 孙公权齐静姜鲁华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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