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Preparation method of high-CO-toxicity-resistant Pt-M/graphene catalyst

A graphene and catalyst technology, applied in the field of preparation of Pt-M/graphene catalyst, can solve the problems of difficult control of particle and dispersion, low adsorption rate and high platinum loading

Inactive Publication Date: 2013-07-24
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a Pt-M / graphene catalyst with high resistance to CO toxicity, which not only solves the problem of difficult control of particles and dispersion, high platinum loading, and low adsorption rate of electrocatalysts using traditional preparation methods And agglomeration and other defects, greatly improving the ability of the catalyst to resist CO toxicity, and has the advantages of simple process and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 9.75gPt of H 2 PtCl 6 ·6H 2 RuCl with O and 10.1 g Ru 3 ·3H 2 O respectively add methanol, ethanol, propylene glycol, glycerol, ethylene glycol, polyvinyl alcohol or both to dissolve and combine, to ensure that the metal concentration is between 1-20mol / L, add 0.01-0.4mol of phosphoric acid or Citric acid, ultrasonic 15-30min; add to 44.4g of carrier carbon, stir for 20-40h, dehydrate to constant weight by microwave; add deionized water after slurry, under stirring, add 14.8-296mL concentration of 0.05-10mol / L of methanol, formaldehyde, formic acid, sodium borohydride, hydrazine hydrate or one or two solutions to reduce and heat up to 40-95°C; filter, wash the catalyst repeatedly with deionized water, and dehydrate and dry by microwave at 90-120°C A Pt-Ru / graphene electrocatalyst with a loading of 25 wt% was obtained.

[0023] The average particle size of the Pt-Ru alloy nanoparticles prepared in this example is 2.3nm, and the dispersion degree of the alloy partic...

Embodiment 2

[0025] 9.75gPt of H 2 PtCl 6 ·6H 2 PdCl with O and 2.65 gPd 2 Add one or two of methanol, ethanol, propylene glycol, glycerol, ethylene glycol, polyvinyl alcohol to dissolve and combine, and ensure that the metal concentration is between 1-20mol / L, add 0.00375-0.15mol of phosphoric acid or lemon Acid, ultrasonic for 15-30min; added to 37.2g of carrier graphene, stirred for 20-40h, dehydrated to constant weight by microwave; after adding deionized water to slurry, under stirring, add 24.8-496mL concentration of 0.05-10mol / L of methanol, formaldehyde, formic acid, sodium borohydride, hydrazine hydrate or one or two solutions to reduce and heat up to 40-95°C; filter, wash the catalyst repeatedly with deionized water, and dehydrate and dry by microwave at 90-120°C A Pt–Pd / graphene electrocatalyst with a loading of 25 wt% was obtained.

[0026] The average particle diameter of the Pt-Pd alloy nanoparticles prepared in this embodiment is 2.1nm, and the degree of dispersion of t...

Embodiment 3

[0029] 9.75gPt of H 2 PtCl 6 ·6H 2 NiCl with O and 1.45gNi 2 Add one or two of methanol, ethanol, propylene glycol, glycerol, ethylene glycol, and polyvinyl alcohol to dissolve and combine to ensure that the metal concentration is between 1-20mol / L, and add 0.005-0.2mol of phosphoric acid or lemon Acid, ultrasonic for 15-30min; added to 33.6g of carrier graphene, stirred for 20-40h, dehydrated to constant weight by microwave; after slurrying with deionized water, under stirring, add 2.53-50.6mL concentration of 0.05- One or two solutions of 10mol / L methanol, formaldehyde, formic acid, sodium borohydride, and hydrazine hydrate are reduced, and the temperature is raised to 40-95°C; filtered, the catalyst is repeatedly washed with deionized water, and dehydrated by microwave at 90-120°C After drying, a Pt-Ni / graphene electrocatalyst with a loading of 25 wt% was obtained.

[0030] The average particle size of the Pt-Ni alloy nanoparticles prepared in this example is 1.8nm, and...

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Abstract

The invention discloses a preparation method of a high-CO-toxicity-resistant Pt-M / graphene catalyst. According to the method, H2PtCl6.6H2O and an M compound are respectively subjected to alcohol dissolving, mixing, and ultrasonic processing; graphene is impregnated in the mixture; microwave dehydration is carried out until a constant weight is reached; water is added for pulping; a reducing agent is added for reducing; and filtering, washing, and microwave dehydration are carried out, such that the Pt-M / graphene catalyst is obtained. With the Pt-M / graphene composite catalyst provided by the invention, defects such as particle and dispersion control difficulty, high platinum load, easy catalyst agglomeration, and the like of the electro-catalyst prepared with traditional methods are overcome; and catalyst CO-intoxication-resistance and catalytic activity are greatly improved.

Description

technical field [0001] The invention belongs to the field of catalytic preparation, and in particular relates to a method for preparing a high-CO toxicity-resistant Pt-M / graphene catalyst for fuel cells. Background technique [0002] Fuel cells are considered to be one of the most ideal new energy technologies in the future. Among them, direct methanol fuel cells have the advantages of high energy conversion density, low pollution, diverse fuels, high reliability, low noise and easy maintenance, and can be widely used in power It is considered one of the most promising alternative energy technologies for large-scale commercial application. However, the anode catalysts of direct methanol fuel cells have problems such as low electrocatalytic activity and poor resistance to CO poisoning. These problems make this type of batteries unable to meet the commercial requirements. [0003] Pure platinum has low catalytic efficiency to methanol and is easily poisoned. Recently many re...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J23/44B01J23/89B01J23/652H01M4/92
CPCY02E60/50
Inventor 银凤翔陈标华
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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