Preparation method of proton exchange membrane fuel cell negative electrode catalyst with defect-structure nitrogen/sulfur co-doped porous carbon aerogel

A defect structure, carbon aerogel technology, applied in the direction of fuel cells, battery electrodes, structural parts, etc., can solve problems such as unsatisfactory catalytic performance, and achieve the effects of high safety, wide source of raw materials, and good stability

Active Publication Date: 2018-08-24
SHANDONG SUNRISE NEW MATERIAL TECH CO LTD
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  • Application Information

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Problems solved by technology

Studies have found that carbon materials doped with heteroatoms (nitrogen, boron, phosphorus, sulfur, silicon, etc.) have certain catalytic activity for the ORR process in alkaline electrolytes, and have the potential to replace Pt, but their carbon materials are not stable in acidic electrolytes. The catalytic performance is not ideal compared to commercial Pt / C

Method used

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  • Preparation method of proton exchange membrane fuel cell negative electrode catalyst with defect-structure nitrogen/sulfur co-doped porous carbon aerogel
  • Preparation method of proton exchange membrane fuel cell negative electrode catalyst with defect-structure nitrogen/sulfur co-doped porous carbon aerogel
  • Preparation method of proton exchange membrane fuel cell negative electrode catalyst with defect-structure nitrogen/sulfur co-doped porous carbon aerogel

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Embodiment 1

[0024] 1) Configure 200mL of iota-type carrageenan aqueous solution with a mass fraction of 2%, add 4g of urea, cool down after stirring, and obtain a carrageenan-urea hydrogel.

[0025] 2) preparing carrageenan-urea hydrogel into carrageenan-urea aerogel by freeze-drying;

[0026] 3) Carrageenan-urea airgel was calcined at 700°C for 1 hour in a tube furnace under an argon atmosphere to obtain nitrogen / sulfur co-doped carbon airgel;

[0027] 4) Remove calcium sulfide, sodium sulfide and other nanoparticles in the nitrogen / sulfur co-doped carbon aerogel with an aqueous hydrochloric acid solution with a concentration of 2M to obtain a nitrogen / sulfur co-doped porous carbon aerogel;

[0028] 5) The obtained nitrogen / sulfur co-doped porous carbon airgel is subjected to high-temperature heat treatment (1000°C, 1 hour) to remove a part of nitrogen and sulfur heteroatoms to obtain a nitrogen / sulfur co-doped porous carbon gas with a defect structure gel;

[0029] 6) Use an electroch...

Embodiment 2

[0031] 1) Configure 200mL of iota-type carrageenan aqueous solution with a mass fraction of 2%, add 4g of urea, cool down after stirring, and obtain a carrageenan-urea hydrogel.

[0032] 2) preparing carrageenan-urea hydrogel into carrageenan-urea aerogel by freeze-drying;

[0033] 3) Carrageenan-urea airgel was calcined at 700°C for 1 hour in a tube furnace under an argon atmosphere to obtain nitrogen / sulfur co-doped carbon airgel;

[0034] 4) Remove calcium sulfide, sodium sulfide and other nanoparticles in the nitrogen / sulfur co-doped carbon aerogel with an aqueous hydrochloric acid solution with a concentration of 2M to obtain a nitrogen / sulfur co-doped porous carbon aerogel;

[0035] 5) The obtained nitrogen / sulfur co-doped porous carbon airgel is subjected to high-temperature heat treatment (1100°C, 1 hour) to remove a part of nitrogen and sulfur heteroatoms to obtain a nitrogen / sulfur co-doped porous carbon gas with a defect structure gel;

[0036] 6) Use an electroch...

Embodiment 3

[0038] 1) Configure 200mL of iota-type carrageenan aqueous solution with a mass fraction of 2%, add 4g of urea, cool down after stirring, and obtain a carrageenan-urea hydrogel.

[0039] 2) preparing carrageenan-urea hydrogel into carrageenan-urea aerogel by freeze-drying;

[0040] 3) Carrageenan-urea airgel is calcined at 600, 800, 900, and 1000°C for 1 hour in a tube furnace under an argon atmosphere to obtain nitrogen / sulfur co-doped carbon airgel;

[0041] 4) Remove calcium sulfide, sodium sulfide and other nanoparticles in the nitrogen / sulfur co-doped carbon aerogel with an aqueous hydrochloric acid solution with a concentration of 2M to obtain a nitrogen / sulfur co-doped porous carbon aerogel;

[0042] 5) The obtained nitrogen / sulfur co-doped porous carbon airgel is subjected to high-temperature heat treatment (1000°C, 1 hour) to remove a part of nitrogen and sulfur heteroatoms to obtain a nitrogen / sulfur co-doped porous carbon gas with a defect structure gel;

[0043] ...

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Abstract

The invention discloses a preparation method of proton exchange membrane fuel cell negative electrode catalyst with defect-structure nitrogen / sulfur co-doped porous carbon aerogel, and belongs to thefield of a fuel cell. In the carbon aerogel, the PEMFCs negative electrode catalyst is successfully prepared by taking carrageenan and urea as raw materials. The carbon aerogel is provided with a richdefect structure and a nitrogen and sulfur heteroatom co-doped and hierarchical porous structure, and excellent oxidization-reduction reaction (ORR) catalytic activity is shown (a half-wave potentialunder 0.5M of H2SO4 electrolyte is 0.76V); and the ORR activity of a traditional heteroatom-doped carbon material under an acid electrolyte is not ideal compared with commercial Pt / C, thus, the ORR catalytic performance of the negative electrode catalyst under the acid condition is improved, and the negative electrode catalyst has important significance when applied to the PEMFCs instead of a previous metal Pt-based catalyst. In the negative electrode catalyst, the carrageenan is rich in source, and the nitrogen / sulfur co-doped porous carbon aerogel having the defect structure is excellent inORR catalytic performance and is a potential energy conversion material.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to a method for preparing a nitrogen / sulfur co-doped porous carbon airgel proton exchange membrane fuel cell cathode catalyst with a defect structure. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is currently the main catalyst for the noble metal Pt-based catalyst. However, the high price and low reserves of Pt seriously hinder the commercialization of PEMFC. The development of low-cost, high-performance oxygen reduction (ORR) catalysts is the key to solving the shortage of platinum resources, reducing the cost of fuel cells, and realizing the commercialization of fuel cells. Studies have found that carbon materials doped with heteroatoms (nitrogen, boron, phosphorus, sulfur, silicon, etc.) have certain catalytic activity for the ORR process in alkaline electrolytes, and have the potential to replace Pt, but their carbon materials are not stable in acidic elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90
CPCH01M4/8605H01M4/88H01M4/90H01M4/9008H01M4/9083H01M2008/1095Y02E60/50
Inventor 王晓东
Owner SHANDONG SUNRISE NEW MATERIAL TECH CO LTD
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