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Preparation method and application of platinum-based catalyst based on etching treatment carbon carrier

A carbon carrier and catalyst technology, which is applied in the field of preparation of platinum-based catalysts, can solve the problems of poor catalytic activity and stability, hinder the development and application of HT-PEMFC, and the catalyst is prone to aging, so as to achieve low cost and increase electrochemical efficiency. Active surface area, effects of limiting migration and loss

Inactive Publication Date: 2020-05-05
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the harsh operating environment (acidity and high temperature) of HT-PEMFC, the catalyst is prone to aging
Pt-based catalysts on cathode carbon supports suffer from severe carbon corrosion and weak metal-support interactions, leading to dissolution and aggregation of Pt particles, resulting in relatively poor catalytic activity and stability; these drawbacks severely hamper Development and Application of HT-PEMFC

Method used

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  • Preparation method and application of platinum-based catalyst based on etching treatment carbon carrier
  • Preparation method and application of platinum-based catalyst based on etching treatment carbon carrier
  • Preparation method and application of platinum-based catalyst based on etching treatment carbon carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Etching treatment of carbon support

[0034] Weigh 500 mg of carbon powder (Vulcan XC-72) and add it to an acetone solution that is about twice the volume of carbon powder, stir at room temperature for 3 hours, filter and wash with deionized water, and then vacuum dry at 80 °C; obtain acetone-treated carbon Support; acetone-treated carbon support was added to 10 wt% HNO 3 and 30wt%H 2 O 2 In the mixture (volume ratio HNO 3 :H 2 O 2 =2:1), refluxed at 60°C for 5h, filtered, washed with deionized water until neutral, and dried in vacuum at 80°C; 100mg of the dried carbon powder was added to 100ml of Fe with a concentration of 0.5mol / L (NO 3 ) 3 The solution was stirred at room temperature for 1 h, dried in a drying oven, and then sintered in a muffle furnace at 370 °C for 6 h; the samples after high temperature sintering were washed with dilute hydrochloric acid solution and deionized water, and dried to obtain the etched the carbon carrier;

[0035] (2) Prep...

Embodiment 2

[0040] The carbon powder (Vulcan XC-72) in Example 1 was replaced with carbon fibers, and the remaining steps were the same as those in Example 1, and finally a Pt-based catalyst using an etched carbon support was obtained.

[0041] from figure 1 It can be seen that the voltage decay rate of the single cell is 57 μV / min. from image 3 It can be seen from the polarization curve of -2 down to 0.56W cm -2 , about 5.08%; 0.5A cm -2 The voltage at the discharge current density decreased from 0.59V to 0.56V, about 5.08%.

Embodiment 3

[0043] (1) Preparation of carbon carrier:

[0044] Weigh 500 mg of carbon powder (Vulcan XC-72) and add it to an acetone solution with twice the volume of carbon powder, stir at room temperature for 3 h, filter and wash with deionized water, and then vacuum dry at 80 °C; 10wt% HNO 3 and 30wt%H 2 O 2 In the mixture (volume ratio HNO 3 :H 2 O 2 =1:1), refluxed at 50 °C for 8 h, filtered, washed with deionized water until neutral, and dried in vacuum at 80 °C; 100 mg of the dried carbon powder was added to 100 ml of 0.5mol / L Fe(NO) 3 ) 3 In the solution, stir at room temperature for 1 h, put it into a drying box to dry, and then sinter it in a muffle furnace at 350 °C for 8 h; wash the sample after high temperature sintering with dilute hydrochloric acid solution and deionized water, and dry it to obtain a high specific gravity surface area carbon support;

[0045] (2) Preparation of catalyst:

[0046] Take 30mL of ethylene glycol (EG), add 2.65ml of 20mg / ml H dropwise u...

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Abstract

The invention relates to the field of fuel cell catalysts, and in particular relates to a preparation method and application of a platinum-based catalyst based on an etching treatment carbon carrier.The preparation method comprises the steps of firstly, preparing an etched carbon carrier; then, adding chloroplatinic acid into an ethylene glycol solution, adding sodium citrate and the carbon carrier, adjusting the pH value of the solution after uniform dispersion, and placing the solution in a sealed high-pressure reaction kettle for a reaction; and cooling, adjusting the pH value, carrying out ultrasonic treatment, filtering and drying to obtain the platinum-based catalyst based on the carbon carrier subjected to etching treatment. According to the invention, the operation is simple; theetched carbon carrier has a stable structure and a large specific surface area; uniform dispersion and attachment of platinum nanoparticles can be promoted; the electrochemical active surface area ofthe catalyst nanoparticles is increased; the catalytic activity is improved; migration and loss of the platinum nanoparticles are limited, and the stability is improved; and in addition, the catalystusing the etching treatment carbon carrier shows higher activity and stronger stability than a commercial Pt / C catalyst.

Description

technical field [0001] The invention relates to the field of fuel cell catalysts, in particular to a preparation method and application of a platinum-based catalyst based on an etching treatment carbon carrier. Background technique [0002] Polyelectrolyte membrane fuel cell (PEMFC), as the fifth-generation fuel cell, is considered to be one of the most promising clean energy technologies in this century. The research on this type of fuel cell is a hot topic in this field. However, the practical application is faced with the problems of fuel reforming and purification, difficult hydrothermal management, complex structure and high cost. Increasing the operating temperature of fuel cells is considered to be an ideal way to solve the main problems currently faced by polymer electrolyte membrane fuel cells. Compared with the traditional low temperature membrane fuel cell (LT-PEMFC), the operating temperature of the high temperature membrane fuel cell (HT-PEMFC) is 120 ℃ ~ 200 ℃...

Claims

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Application Information

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IPC IPC(8): H01M4/92B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/926Y02E60/50
Inventor 张玮琦马强苏华能徐谦
Owner JIANGSU UNIV
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