Preparation method of electrocatalyst carrier for fuel cell

An electrocatalyst and fuel cell technology, applied in the field of materials, can solve problems such as easy agglomeration of carbon black, easy coating of Pt, and many surface atomic defects

Active Publication Date: 2015-01-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon black is very easy to agglomerate, and its structure is easily destroyed during processing, which makes Pt easy to be coated, which makes the catalytic active center relatively reduced, thereby reducing the activity of the catalyst.
In addition, during the long-term operation of the fuel cell, the carbon black will be oxidized and corroded due to changes in temperature, humidity, PH value, and operating voltage, resulting in the detachment and loss of catalyst particles from the surface of the carrier, resulting in irreversible attenuation of fuel cell performance.
Third, the hydrophilicity of the surface of the carrier that undergoes electrochemical corrosion is enhanced, which destroys the mass transfer balance of the water i...

Method used

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  • Preparation method of electrocatalyst carrier for fuel cell
  • Preparation method of electrocatalyst carrier for fuel cell
  • Preparation method of electrocatalyst carrier for fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 1) High temperature calcination treatment of vermicular expanded graphite material

[0044] Take the BET specific surface area as 300m 2 / g, average pore diameter is 600mg of expanded graphite material of 20nm, is placed in tube furnace, in N 2 After heat treatment at 600°C for 3h under atmosphere, cool down to room temperature.

[0045] 2) Clogging treatment of worm-like expanded graphite material

[0046] Take 1.5ml of n-heptane and dissolve it in 78.5ml of absolute ethanol; weigh 200mg of expanded graphite material that has been heat-treated at high temperature, disperse it in the above solution, ultrasonicate and stir evenly; heat up from room temperature at 5°C / min to 80±2 ℃, after reflux dipping for 1.5h, let stand to cool down to room temperature.

[0047] 3) Drying by rotary evaporation under reduced pressure

[0048] Rotary steam the slurry in 2) at 38°C and -0.05MPa under reduced pressure for 1 hour, and the rotation speed is 50rpm.

[0049] 4) Vacuum dry...

Embodiment 2

[0057] 1) High temperature calcination treatment of vermicular expanded graphite material

[0058] Take the BET specific surface area as 100m 2 / g, 600mg of expanded graphite material with an average pore diameter of 50nm, placed in a tube furnace, heat-treated at 1000°C for 6h under an Ar atmosphere, and then cooled to room temperature.

[0059] 2) Clogging treatment of worm-like expanded graphite material

[0060] Take 2.5ml of nonane and dissolve it in 77.5ml of absolute ethanol; weigh 200mg of expanded graphite material that has been heat-treated at high temperature, and disperse it in the above solution; heat up from room temperature at 10°C / min to 80±2°C, and reflux for 3 hours , let it cool down to room temperature.

[0061] 3) Drying by rotary evaporation under reduced pressure

[0062] Rotate the slurry in 2) at 45°C and -0.1MPa under reduced pressure for 0.5h, with a rotation speed of 100rpm.

[0063] 4) Vacuum drying

[0064] Transfer the powder obtained in 3) ...

Embodiment 3

[0073] 1) High temperature calcination treatment of vermicular expanded graphite material

[0074] Take the BET specific surface area as 500m 2 / g, 600mg of expanded graphite material with an average pore diameter of 15nm, placed in a tube furnace, heat-treated at 500°C for 9h under an Ar atmosphere, and then cooled to room temperature.

[0075] 2) Clogging treatment of worm-like expanded graphite material

[0076] Take 5.0ml of decane and dissolve it in 75.0ml of ether; weigh 200mg of expanded graphite material that has been heat-treated at high temperature, and disperse it in the above solution; raise the temperature from room temperature to 35±2°C at 5°C / min, reflux for 5 hours, and then statically Allow to cool down to room temperature.

[0077] 3) Drying by rotary evaporation under reduced pressure

[0078] Rotate the slurry in 2) at 30°C and -0.1MPa for 2 hours under reduced pressure, and the rotation speed is 80rpm.

[0079] 4) Vacuum drying

[0080] Transfer the pow...

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Abstract

The present invention relates to a preparation method of an electrocatalyst carrier for fuel cells. The electrocatalyst carrier is prepared from raw materials of expanded graphite with BET surface area of no less than 100m<2> / g and average pore size of no less than 10 nm through high temperature calcination, hole plugging treatment and drying treatment; and the obtained carrier has BET specific surface area of no less than 120m<2> / g and average pore size of 8-16 nm. Compared with the traditional carbon materials, the electrocatalyst carrier has larger specific surface area, is easier to capture and uniformly disperse nano Pt particles, also has high better potential stability. The Pt / C electrocatalyst prepared by using the treated worm-shape expanded graphite as carrier preparation has the advantages of multiple active sites, high activity and stability.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a treatment process of expanded graphite material and its application as a fuel cell electrocatalyst carrier. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy stored in fuel and oxidant into electrical energy. It has the advantages of low pollution, simple structure, and high energy conversion efficiency. Among them, the proton exchange membrane fuel cell has the outstanding advantages of high output efficiency and environmental friendliness, and has broad application prospects. It can start at low temperature, has no electrolyte corrosion and leakage, and is easy to operate. It has strong competitive advantages and huge potential application prospects in the fields of electric vehicles, regional power stations, spacecraft, and portable power supplies. [0003] Electrocatalyst is the key material of fuel cell, its ac...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/18B01J23/42H01M4/92
CPCY02E60/50
Inventor 邱艳玲张华民钟和香毛景霞
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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