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Phosphoric-acid-functionalized carbon nano tubes (CNTs)-supported Pt catalyst for direct methanol fuel cell and preparation method of catalyst

A methanol fuel cell, carbon nanotube technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., to solve problems with poor stability and low current density. Effect

Active Publication Date: 2015-11-18
深圳名飞远科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, phosphoric acid is functionalized onto carbon nanotubes through covalent bonding, and it is used as a Pt catalyst carrier to apply it to the anode catalyst of DMFC to investigate the electrocatalytic oxidation of methanol. There is no relevant report yet.

Method used

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  • Phosphoric-acid-functionalized carbon nano tubes (CNTs)-supported Pt catalyst for direct methanol fuel cell and preparation method of catalyst
  • Phosphoric-acid-functionalized carbon nano tubes (CNTs)-supported Pt catalyst for direct methanol fuel cell and preparation method of catalyst
  • Phosphoric-acid-functionalized carbon nano tubes (CNTs)-supported Pt catalyst for direct methanol fuel cell and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] see figure 1 , a method for preparing a phosphoric acid functionalized carbon nanotube-supported platinum catalyst for a direct methanol fuel cell, comprising the steps of:

[0042] 1) Preparation of oxidized carbon nanotubes: add carbon nanotubes to concentrated sulfuric acid and concentrated nitric acid and stir, the stirring temperature is 30-80°C, and the reflux stirring time is 2-6 hours; then cool and dilute, filter with suction, wash with hydrochloric acid, Washing with water, drying in vacuum at a temperature of 70°C, to obtain oxidized carbon nanotubes;

[0043] Specifically, put 2.0g of CNTs in a 100mL round-bottomed flask, then add 30mL of concentrated sulfuric acid and 10mL of concentrated nitric acid and mix evenly. At 50°C, reflux with constant temperature magnetic stirring for 3 hours, naturally cool to room temperature, dilute with deionized water, and reduce Pressure suction filtration, washed with 5% hydrochloric acid solution, and then washed with de...

Embodiment 2

[0057] see figure 1 , a method for preparing a phosphoric acid functionalized carbon nanotube-supported platinum catalyst for a direct methanol fuel cell, comprising the steps of:

[0058] 1) At room temperature, put 2.0g of CNTs in a 100mL round-bottom flask, then add 40mL of concentrated sulfuric acid and 15mL of concentrated nitric acid and mix well. At 60°C, reflux with constant temperature magnetic stirring for 180 minutes, naturally cool to room temperature, and dilute with deionized water , filtered under reduced pressure, washed with 5% hydrochloric acid solution, and then washed with deionized water until neutral, until no SO 4 2- ions; dried under vacuum at 60°C to obtain oxidized carbon nanotubes, which are denoted as Ox-CNTs-2;

[0059] 2) Take 1.0g of carbon dioxide nanotubes and put them into a 100mL round bottom flask, add 40mL of oxalyl chloride, reflux and stir the reaction for 12 hours at 60°C, then distill and recover the excess oxalyl chloride at 100°C to...

Embodiment 3

[0064] see figure 1 , a method for preparing a phosphoric acid functionalized carbon nanotube-supported platinum catalyst for a direct methanol fuel cell, comprising the steps of:

[0065] 1) At room temperature, put 2.0g of CNTs in a 100mL round-bottomed flask, then add 30mL of concentrated sulfuric acid and 10mL of concentrated nitric acid and mix well. At 60°C, reflux with constant temperature magnetic stirring for 180 minutes, cool naturally to room temperature, and dilute with deionized water , filtered under reduced pressure, washed with 5% hydrochloric acid solution, and then washed with deionized water until neutral, until no SO 4 2- ion so far. Vacuum drying at 60°C to obtain oxidized carbon nanotubes and denote as Ox-CNTs-3;

[0066] 2) Add 500 mg of carbon dioxide nanotubes to a 100 mL round-bottomed flask, add 35 mL of oxalyl chloride, reflux and stir the reaction at 60°C for 24 hours, then distill and recover the excess oxalyl chloride at 100°C to obtain carbon...

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Abstract

The invention discloses a phosphoric-acid-functionalized carbon nano tubes (CNTs)-supported Pt catalyst for a direct methanol fuel cell (DMFC) and a preparation method of the catalyst. The preparation method comprises the following steps: (1) preparing oxidized carbon nano tubes; (2) preparing carbon nano tubes subjected to acylating chlorination; (3) preparing phosphoric-acid-functionalized carbon nano tubes (P-CNTs); (4)performing ultrasonic dispersion; (5) preparing a Pt / P-CNTs catalyst solution. The preparation method is simple in process and mild in reaction condition, can synthesize a modified CNTs-supported Pt catalyst material for the DMFC, which is small in particle diameter, uniform in dispersion, high in activity and favorable in stability, and is suitable for industrial production. The prepared functionalized carbon nano tubes are excellent in water solubility, and the prepared functionalized CNTs-supported Pt catalyst has a relatively big specific surface area, is uniform in Pt particle dispersion, is relatively high in electrocatalytic activity and strong in CO poisoning resisting capability when being applied to the DMFC, and is low in production cost.

Description

technical field [0001] The invention relates to the fields of electrocatalysis and fuel cells, in particular to a phosphoric acid functionalized carbon nanotube-supported platinum catalyst for direct methanol fuel cells and a preparation method thereof. Background technique [0002] Direct methanol fuel cell (DirectMethanolFuelCell, referred to as DMFC) has the advantages of small size, high specific energy density, low price, environmental friendliness, and easy storage and transportation of raw materials. Application prospect. However, the anode catalyst of DMFC is still dominated by Pt, which leads to high production cost of DMFC, low electrocatalytic activity, and poor resistance to CO poisoning, which restricts the commercialization of DMFC. [0003] Studies have shown that the performance of DMFC anode catalyst is related to the type of support, specific surface area of ​​support, water solubility, conductivity and mass transfer ability, thermal stability and so on. ...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J35/10H01M4/92
CPCY02E60/50
Inventor 钟新仙冯崎鹏孔洁倩陈涛李庆余林有铖
Owner 深圳名飞远科技有限公司
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