Preparation method for carbon dry gel

A xerogel, gel technology, applied in chemical instruments and methods, catalyst activation/preparation, electrical components, etc., can solve problems such as pore structure, specific surface area and other properties that need to be further optimized, to speed up the commercialization process, solvent Safe, high oxygen reduction reactivity effect

Active Publication Date: 2011-06-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, many new carbon materials such as carbon nanotubes, carbon nanofibers, carbon nanocages, and carbon gels have been used as fuel cell catalyst supports in fuel cells, which has improved the oxidation and corrosion resistance of catalyst supports to a certain extent. , but the pore structure, specific surface area and other properties need to be further optimized

Method used

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  • Preparation method for carbon dry gel
  • Preparation method for carbon dry gel
  • Preparation method for carbon dry gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Dissolve 6.16g of resorcinol in 4mL of deionized water to form a transparent solution A; take 5.13ml of cobalt nitrate hexahydrate aqueous solution with a concentration of 20mg / mL and add it dropwise to the above-mentioned transparent solution A while stirring, and mix well to obtain solution B ; Add 9.08g of formaldehyde solution dropwise to the stirring solution B, further stir and mix evenly, and continue to stir in an environment of 60°C until the reaction forms gel C; transfer the gel C to a vacuum drying oven for vacuum drying at 80°C Aging treatment for 7d, crushing and grinding after taking out to obtain solid powder D; solid powder D was graphitized at 1800°C in N2 for 3h, N 2 Gas purged to room temperature, 0.5M H 2 SO 4 The solution was washed to remove metal salts to obtain a carbon xerogel carrier Co-CX with a molar ratio of resorcinol and cobalt nitrate of 32:1. The Pt / Co-CX1800 catalyst with a mass fraction of 20% was prepared by ethylene glycol reducti...

Embodiment 2

[0048] Dissolve 6.16g of resorcinol in 7mL of deionized water to form a transparent solution A; take 0.4355g of cobalt acetate tetrahydrate solid and add it to the above transparent solution A while stirring, and mix well to obtain solution B; Add 9.08g of formaldehyde solution dropwise, stir and mix evenly, and keep stirring at 20°C until the reaction forms gel C; transfer the gel C to a vacuum drying oven for 3 days of vacuum drying and aging treatment at 60°C, take it out, crush and grind , to obtain solid powder D; solid powder D in N 2 Medium 1500℃ high temperature graphitization treatment for 1h, N 2 Gas purged to room temperature, 2M HNO 3 The solution was washed to remove metal salts to obtain a carbon xerogel carrier Co-CX1500 with a molar ratio of resorcinol and cobalt acetate of 32:1. The Pt / Co-CX1500 catalyst with a mass fraction of 20% was prepared by ethylene glycol reduction method. The electrochemical and battery accelerated decay test results show that befo...

Embodiment 3

[0050] Dissolve 6.16g of resorcinol in 2mL of deionized water to form a transparent solution A; take 0.7063g of ferric nitrate nonahydrate solid and add it to the above transparent solution A while stirring, mix and dissolve evenly to obtain solution B; Add 9.08g of formaldehyde solution dropwise, stir and mix evenly, and continue to stir at 90°C until the reaction forms gel C; transfer gel C to a vacuum drying oven for 3 days of vacuum drying and aging treatment at 80°C, take it out and pulverize Grinding to obtain solid powder D; the solid powder D was graphitized in Ar at 1900°C for 5 h, purged with Ar gas to room temperature, and 4M HNO 3 The solution was washed to remove metal salts to obtain a carbon xerogel carrier Fe-CX1900 with a molar ratio of resorcinol and iron nitrate of 32:1. The Pt / Fe-CX1900 catalyst with a mass fraction of 20% was prepared by sodium borohydride reduction method. The electrochemical and battery accelerated decay test results show that before an...

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Abstract

The invention relates to a carbon carrier of a proton exchange membrane fuel cell, in particular to a preparation method for carbon dry gel. The carbon dry gel is prepared by m-dihydroxybenzene, formaldehyde and a metal salt serving as raw materials, wherein the metal salt comprises a soluble nitrate, a carbonate, a sulfate, an acetate or a halide of one or more metal elements in an IVB group, a VB group, a VIB group, a VIIB group, a VIII group, an IB group and an IIB group; the m-dihydroxybenzene serving as a precursor and the formaldehyde are in the mol ratio of 2:1; the m-dihydroxybenzene and the metal salt are in the mol ratio of 10:1-500:1; and a high-stability carbon carrier is prepared by graphitizing mixed organic carbon dry gel at the high temperature of 1,500 to 3,500 DEG C. When serving as an anti-corrosion carbon material and being used as a cathode catalyst carrier of the proton exchange membrane fuel cell, the carbon dry gel has high anti-corrosion performance and high stability in an acidic and high-potential environment of cell operation.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell carbon carrier, specifically a method for preparing a corrosion-resistant, highly stable carbon xerogel as a proton exchange membrane fuel cell cathode catalyst carrier, and the carbon xerogel can be used as Carrier, used in proton exchange membrane fuel cell cathode catalyst. Background technique [0002] A fuel cell is a conversion device that directly converts the chemical energy of a substance into electrical energy. It is considered to be the fourth type of power generation technology after hydropower, thermal power and nuclear power. The fuel cell does not work in the form of a heat engine, and most of the chemical energy of the fuel in the fuel cell can be directly converted into electrical energy. The power generation process is not limited by the Carnot cycle, and has a high energy conversion efficiency (40-60%). At the same time, almost no SO2 and NO are produced during the fuel c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/96B01J37/08B01J32/00
CPCY02E60/50
Inventor 张华民金虹钟和香马原蔚徐婷
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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