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Preparation method of silica-modified multi-spherical-cavity carbon material and application of carbon material to fuel cell membrane electrode

A technology of silicon dioxide and carbon materials, which is applied in the direction of fuel cells, battery electrodes, silicon dioxide, etc., can solve the problems of increasing energy consumption and increasing the complexity of batteries, and achieves long service life, good performance and stability, and relatively The effect of large surface area

Active Publication Date: 2016-10-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this also increases the complexity of the battery and adds additional energy consumption

Method used

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  • Preparation method of silica-modified multi-spherical-cavity carbon material and application of carbon material to fuel cell membrane electrode
  • Preparation method of silica-modified multi-spherical-cavity carbon material and application of carbon material to fuel cell membrane electrode
  • Preparation method of silica-modified multi-spherical-cavity carbon material and application of carbon material to fuel cell membrane electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0046] (1) SiO 2 - Preparation of MSCC-2h material:

[0047] 1) Take 82 mg, 2.1 mL and 45 mL of L-arginine, cyclohexane and water, respectively, and fully dissolve them under stirring at 60°C to obtain a mixed solution A;

[0048] 2) Add 2.1 mL tetraethyl orthosilicate to the mixed solution A obtained in step 1) at a rate of 1 drop / second, keep the temperature and continue stirring for 12 h to obtain the silica pellet mother solution B;

[0049] 3) Add the growth solution prepared with 5 mL cyclohexane, 4 mL tetraethyl orthosilicate and 50 mL water to the silica pellet mother liquid B obtained in step 2), keep the temperature and continue stirring for 15 h to obtain Silica sol C;

[0050] 4) Add 0.8 g of PVP-k30 to the silica gel C obtained in step 3) to obtain a mixed solution D;

[0051] 5) Adjust the pH value of the mixed solution D obtained in step 4) to 0 with concentrated hydrochloric acid, add 6.7 mL of aniline to the mixed solution D under continuous stirring, and t...

Embodiment 2

[0060] (1) SiO 2 - Preparation of MSCC-2h material:

[0061] 1) Take 82 mg, 4.2 mL and 90 mL of L-arginine, cyclohexane and water, respectively, and fully dissolve them under stirring at 40°C to obtain a mixed solution A;

[0062] 2) Add 5.2 mL of ethyl orthosilicate to the mixed solution A obtained in step 1) at a rate of 2 drops / second, keep the temperature and continue stirring for 18 h to obtain the silica pellet mother solution B;

[0063] 3) Add the growth solution prepared with 45 mL cyclohexane, 24 mL tetraethyl orthosilicate and 300 mL water to the silica pellet mother liquid B obtained in step 2), keep the temperature and continue stirring for 22.5 h to obtain silica Sol C;

[0064] 4) Add 0.5 g PVP-k10 and 0.5 g PVP-k15 to the silica gel C obtained in step 3) to obtain a mixed solution D;

[0065] 5) Adjust the pH value of the mixed solution D obtained in step 4) to 0.15 with concentrated hydrochloric acid, add 18.7 mL of aniline to the mixed solution D under con...

Embodiment 3

[0072] (1) SiO 2 - Preparation of MSCC-4h material:

[0073] 1) Take 82 mg, 6.3 mL and 135 mL of L-arginine, cyclohexane and water, respectively, and fully dissolve them under stirring at 80°C to obtain a mixed solution A;

[0074] 2) Add 8.32 mL tetraethyl orthosilicate to the mixed solution A obtained in step 1) at a rate of 1.5 drops / second, keep the temperature and continue stirring for 24 h to obtain the silica pellet mother solution B;

[0075] 3) Add the growth solution prepared with 120 mL cyclohexane, 60 mL tetraethyl orthosilicate and 750 mL water to the silica pellet mother liquid B obtained in step 2), keep the temperature and continue stirring for 30 h to obtain silica Sol C;

[0076] 4) Add 0.625 g PVP-k17 and 0.625 g PVP-k30 to the silica gel C obtained in step 3) to obtain a mixed solution D;

[0077] 5) Adjust the pH value of the mixed solution D obtained in step 4) to 0.3 with concentrated hydrochloric acid, add 31.7 mL of aniline to the mixed solution D u...

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Abstract

The invention discloses a preparation method of a silica-modified multi-spherical-cavity carbon material and application of the carbon material to a fuel cell membrane electrode. According to the method, a silica bead is used as a template, aniline is polymerized around the bead, the silica bead is carbonized and etched in sequence, and the nitrogen-doped silica-modified multi-spherical-cavity carbon material is obtained. The size of spherical cavities of the multi-spherical-cavity carbon material is controllable, meanwhile the multi-spherical-cavity carbon material has certain oxygen reduction electrochemical activity, and therefore the carbon material can serve as a material relevant to electro-catalysis. Besides, silica modification enables the multi-spherical-cavity carbon material to have self-humidifying performance. A catalyst prepared from the silica-multi-spherical-cavity carbon material which serves as a carrier carrying Pt is high in electro-catalytic property, good in performance and stability under low humidity and long in service life and is an ideal choice for a fuel cell anode catalyst. It is indicated that the silica-multi-spherical-cavity carbon material can serve as the carrier material of the fuel cell anode catalyst and the material relevant to self-humidifying of the membrane electrode.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for preparing a silicon dioxide-modified multi-spherical cavity carbon material and its application in fuel cell membrane electrodes. Background technique [0002] A fuel cell is a highly efficient energy utilization device that can directly convert the chemical energy stored in fuel into electrical energy. Due to the absence of the shortcomings of traditional energy utilization methods such as the emission of nitrogen and sulfur-containing air pollutants and particulate matter, and because of its high energy conversion efficiency and miniaturization characteristics, fuel cells will have great application prospects in the future energy market . Among them, the proton exchange membrane fuel cell is particularly favored by researchers, and has been applied to the power system of portable electronic devices and electric vehicles in recent years. Although proton exch...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M8/1004H01M8/04119C01B33/12B82Y30/00
CPCB82Y30/00C01B33/12C01P2002/72C01P2004/04C01P2004/64H01M4/926H01M8/04126H01M8/1004Y02E60/50
Inventor 杜丽张嘉熙高莹刘丹丹
Owner SOUTH CHINA UNIV OF TECH
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