High-activity carbon-supported platinum catalyst for low-platinum-loading proton exchange membrane fuel cell and preparation method thereof

A proton exchange membrane, fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of wide particle size distribution of Pt particles, complex reduction and purification processes, acceptable battery power density, etc. The effect of increased density and simple method

Inactive Publication Date: 2020-04-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are strict requirements on solvent, pH value and operating conditions, and it is difficult to control. Adding a protective agent can control the particle size and distribution of Pt particles, which also increases the complexity of the operation and increases the cost.
The above-mentioned methods are all chemical preparation methods. The main disadvantage is that the preparation process is cumb

Method used

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  • High-activity carbon-supported platinum catalyst for low-platinum-loading proton exchange membrane fuel cell and preparation method thereof
  • High-activity carbon-supported platinum catalyst for low-platinum-loading proton exchange membrane fuel cell and preparation method thereof
  • High-activity carbon-supported platinum catalyst for low-platinum-loading proton exchange membrane fuel cell and preparation method thereof

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preparation example Construction

[0032] A method for preparing a highly active carbon-supported platinum-type catalyst for a proton exchange membrane fuel cell with a low platinum loading capacity, comprising the following preparation method:

[0033] (1) Purified carbon powder;

[0034] (2) Preparation of carbon ink:

[0035] Mix carbon powder, isopropanol, deionized water and zirconia and ball mill it;

[0036] (3) Preparation of ultra-thin carbon powder layer:

[0037] Add the carbon ink into a flat-bottomed vessel filled with deionized water, spread the carbon particles evenly on the water surface, and form an ultra-thin carbon powder layer after drying;

[0038] (4) Preparation of highly active carbon-supported platinum catalyst:

[0039] Using ultra-thin carbon powder layer as substrate, platinum was sputtered by magnetic sputtering to prepare highly active carbon-supported platinum catalyst.

[0040] Further, the method of described step (1) purifying carbon powder is: carbon powder is added to H ...

Embodiment 1

[0049] Highly active carbon-supported platinum catalyst

[0050] The preparation method is as follows:

[0051] (1) Purified carbon powder:

[0052] Add toner (Vulcan XC-72) to H 2 o 2 It can be obtained by ultrasonic cleaning in a mixed solution of concentrated sulfuric acid, where H 2 o 2 Concentration is 30wt.%, concentrated sulfuric acid concentration is 98wt.%, H 2 o 2 The mass ratio to concentrated sulfuric acid is 3:1.

[0053] (2) Preparation of carbon ink:

[0054] Mix 0.15 g of carbon powder, 3.35 g of isopropanol, 4 g of deionized water, and 9 g of zirconia balls, put them into a ball mill jar, and take them out after 1.5 hours of ball milling.

[0055] (3) Preparation of ultra-thin carbon powder layer preparation:

[0056] Slowly drop the carbon ink into a petri dish filled with deionized water, so that the carbon particles spread evenly on the water surface to form an ultra-thin toner layer, and place it in a vacuum drying oven at 100°C for 6 hours. The u...

Embodiment 2

[0060] Highly active carbon-supported platinum catalyst

[0061] The preparation method is as follows:

[0062] (1) Purified carbon powder:

[0063] Add toner (Vulcan XC-72) to H 2 o 2 It can be obtained by ultrasonic cleaning in a mixed solution of concentrated sulfuric acid, where H 2 o 2 Concentration is 30wt.%, concentrated sulfuric acid concentration is 98wt.%, H 2 o 2 The mass ratio to concentrated sulfuric acid is 3:1.

[0064] (2) Preparation of carbon ink:

[0065] Mix 0.15 g of carbon powder, 2.25 g of isopropanol, 3 g of deionized water, and 7.5 g of zirconia balls, put them into a ball mill jar, and take them out after 1.5 hours of ball milling.

[0066] (3) Preparation of ultra-thin carbon powder layer preparation:

[0067] Slowly drop the carbon ink into a petri dish filled with deionized water, so that the carbon particles spread evenly on the water surface to form an ultra-thin toner layer, and place it in a vacuum drying oven at 100°C for 6 hours. The...

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Abstract

The invention discloses a high-activity carbon-supported platinum catalyst for low-platinum-loading proton exchange membrane fuel cell and a preparation method thereof. The method comprises the following steps: (1) purifying carbon powder; (2) preparing carbon ink, namely mixing carbon powder, isopropanol, deionized water and zirconium oxide balls, and performing ball milling to obtain the carbonink; (3) preparing an ultrathin carbon powder layer, namely dripping carbon ink into a flat-bottom vessel filled with deionized water, uniformly spreading the carbon particles on the water surface, and performing drying to form the ultrathin carbon powder layer; and (4) preparing the high-activity carbon-supported platinum catalyst, namely preparing the high-activity carbon-supported platinum catalyst by taking the ultrathin carbon powder layer as a substrate and sputtering platinum through magnetron sputtering. The Pt average particle size of the prepared high-activity carbon-supported platinum catalyst is 3 nm, distribution is uniform, the particle size range is 2.5-3.5 nm, and the size distribution range is narrow. The carbon-supported platinum catalyst can be applied to a cathode catalyst layer of a proton exchange membrane fuel cell, and compared with commercial Pt/C, the power density of the cell is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cells, and in particular relates to a highly active carbon-supported platinum type catalyst for low platinum loading proton exchange membrane fuel cells and a preparation method thereof. Background technique [0002] There have been a lot of research reports on the preparation methods of carbon-supported Pt catalysts, mainly including impregnation method, colloid method, microemulsion method, electrochemical deposition method, ion exchange method and supercritical fluid method. The traditional preparation methods that are widely used at present are impregnation method and colloid method. The impregnation method is usually to impregnate activated carbon in acid H 2 PtCl 6 In aqueous solution or alkaline [Pt(NH 3 ) 4 ] Cl 2 In the aqueous solution, then use the reducing agent (such as formaldehyde, hydrogen, etc.) to reduce Pt, and finally obtain the carbon-supported Pt cat...

Claims

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Application Information

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IPC IPC(8): H01M4/92B82Y30/00
CPCB82Y30/00H01M4/926Y02E60/50
Inventor 郭伟傅凯林潘牧
Owner WUHAN UNIV OF TECH
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