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Alkaline fuel cell cathode carbon catalyst and preparation method thereof

A fuel cell cathode and carbon-based catalyst technology, applied in battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of lower catalytic activity than noble metals and their alloy catalysts, tolerance and long-term operation stability Poor performance, the preparation process cannot meet the problems of large-scale production, etc., to achieve the effect of low price, easy purchase and preparation, and good tolerance

Inactive Publication Date: 2015-03-25
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, noble metals and their alloy catalysts with high catalytic activity are still used in the cathode of alkaline fuel cells at present, but the disadvantages are limited resources, high cost, CH 3 OH / CO tolerance and long-term operation stability are poor; carbon-based non-precious metal catalysts that are expected by people are rich in resources, low in price, and excellent in tolerance. The process still cannot meet the needs of commercial mass production

Method used

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  • Alkaline fuel cell cathode carbon catalyst and preparation method thereof
  • Alkaline fuel cell cathode carbon catalyst and preparation method thereof
  • Alkaline fuel cell cathode carbon catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Preparation of CFePc carbon-based non-noble metal catalyst with core-shell nanostructure

[0034] Iron phthalocyanine FePc (purchased from Alfa Aesar) with a specific surface area of ​​1400m 2 / g of high specific surface conductive carbon black EC600JD (purchased from Cabot Company in the United States) weighed two raw materials with a mass ratio of 1:1, put them into a mechanical ball mill for 0.5 hours after simple mixing, and took out the ball-milled product as the nucleus Shell nanostructured CFePc carbon-based non-noble metal catalysts (such as figure 1 shown).

[0035] 2) Test the oxygen reduction performance of CFePc carbon-based non-noble metal catalysts

[0036] Weigh an appropriate amount of carbon-based non-precious metal catalyst powder and evenly disperse it in the isopropanol solution containing Nafion. According to the catalyst loading on the electrode surface of 20 μg, the catalyst dispersion is coated on the surface of the glassy carbon electrode t...

Embodiment 2

[0045] 1) With a specific surface area of ​​250m 2 The preparation of the catalyst when the conductive carbon black is the inner core

[0046] Iron phthalocyanine FePc (purchased from Alfa Aesar) with a specific surface area of ​​250m 2 / g of high specific surface conductive carbon black Vulcan XC72 (purchased from U.S. Cabot Company) weighed two raw materials with a mass ratio of 1:1, put them into a mechanical ball mill for 0.5 hour ball milling after simple mixing, and took out the ball milled product. Core-shell nanostructured CFePc carbon-based non-noble metal catalysts.

[0047] 2) Test the catalytic performance of the catalyst

[0048] Weigh an appropriate amount of carbon-based non-precious metal catalyst powder and evenly disperse it in the isopropanol solution containing Nafion. According to the catalyst loading on the electrode surface of 20 μg, the catalyst dispersion is coated on the surface of the glassy carbon electrode to prepare a working electrode. At the ...

Embodiment 3

[0053] 1) Preparation of the catalyst when the mass ratio of FePc to C is 1:4

[0054] Iron phthalocyanine FePc (purchased from Alfa Aesar) with a specific surface area of ​​1400m 2 / g of high specific surface conductive carbon black EC600JD (purchased from Cabot Company in the United States) weighed two raw materials with a mass ratio of 1:4, put them into a mechanical ball mill for 0.5 hours after simple mixing, and took out the ball-milled product as the nucleus Shell nanostructured CFePc carbon-based non-noble metal catalysts.

[0055] 2) Test the catalytic performance of the catalyst

[0056] Weigh an appropriate amount of carbon-based non-precious metal catalyst powder and evenly disperse it in the isopropanol solution containing Nafion. According to the catalyst loading on the electrode surface of 20 μg, the catalyst dispersion is coated on the surface of the glassy carbon electrode to prepare a working electrode. At the same time, the commercially available 20wt% Pt / ...

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Abstract

The invention discloses a high-performance alkaline fuel cell cathode carbon catalyst and a preparation method of the high-performance alkaline fuel cell cathode carbon catalyst. The catalyst disclosed by the invention is a composite carbon material in a core-shell nanostructure, which is prepared by adulterating two elements of Fe and N, using conductive carbon black with a high-ratio surface as an inner core and coating a phthalocyanine iron shell around the inner core. The preparation method comprises the following steps of: weighing and mixing phthalocyanine iron solid powder and the conductive carbon black with the high-ratio surface according to a certain mass ratio, and then preparing to obtain a C@FePc carbon non-noble metal catalyst in the core-shell nanostructure by adopting a simple mechanical ball milling method. The catalyst disclosed by the invention has high-performance oxygen reduction reaction (ORR) catalytic activity, excellent CH3OH / CO tolerance and good stability, the cost of raw materials used in the preparation process is low, the operation is simple and convenient, and the catalyst is easy for large-scale commercialized production.

Description

technical field [0001] The invention belongs to the field of fuel cells, and relates to an alkaline fuel cell cathode carbon-based catalyst and a preparation method thereof. Background technique [0002] Alkaline fuel cells have the characteristics of high energy, high power, and no pollution, and are considered to be one of the most important power supply devices to solve future energy problems. In the existing alkaline fuel cells, the catalyst, especially the cathode oxygen reduction catalyst, has become one of the main bottlenecks to curb its commercialization due to factors such as high cost, low catalytic efficiency, and poor stability. Based on various factors, noble metals (such as Pt, Pd, Au, Ag) and their alloy catalysts are currently used in the cathode oxygen reduction reaction (ORR) of alkaline fuel cells. However, the limited resources of precious metals in nature lead to the high cost of alkaline fuel cells. Therefore, non-(low) noble metal catalysts with low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90B01J31/22
CPCY02E60/50
Inventor 陈胜利张世明
Owner WUHAN UNIV
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