Fe/Co-N-MCF composite catalyst for fuel cell and preparation method of Fe/Co-N-MCF composite catalyst

A composite catalyst and fuel cell technology, applied in the field of electrocatalysis, can solve the problem that the catalytic performance of ORR is not as good as that of platinum-based catalysts, achieve excellent methanol resistance and stability, meet the needs of large-scale production, and enhance the effect of ORR kinetics

Active Publication Date: 2021-02-05
ZHONGBEI UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the ORR catalytic performance of the current iron-nitrogen-carbon (Fe-N-C) electrocatalyst is still not as good as that of commercial platinum-based catalysts, the present invention provides a Fe / Co-N-MCF composite catalyst for fuel cells and its preparation method

Method used

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  • Fe/Co-N-MCF composite catalyst for fuel cell and preparation method of Fe/Co-N-MCF composite catalyst
  • Fe/Co-N-MCF composite catalyst for fuel cell and preparation method of Fe/Co-N-MCF composite catalyst
  • Fe/Co-N-MCF composite catalyst for fuel cell and preparation method of Fe/Co-N-MCF composite catalyst

Examples

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Effect test

Embodiment 1

[0025] Example 1: A Fe / Co-N-MCF composite catalyst for fuel cells, using cobalt chloride hexahydrate and dimethylimidazole as raw materials to synthesize metal-organic framework ZIF-67, which was pyrolyzed under a nitrogen atmosphere to obtain nitrogen Doped Co-based mesoporous carbon framework Co-N-MCF; Co-N-MCF and ferric chloride solution were added to the high-gravity rotating packed bed, and the iron ions were uniformly adsorbed on Co-N-MCF. The composite catalyst Fe / Co-N-MCF for fuel cells can be obtained by pyrolysis again in nitrogen atmosphere.

[0026] The method for preparing Fe / Co-N-MCF composite catalyst for fuel cell, the steps are as follows:

[0027] (1) Dissolve 5 mmol (1.190g) of cobalt chloride hexahydrate and 40 mmol (3.284g) of dimethylimidazole in 100ml of methanol respectively, and add the methanol solution of cobalt chloride to the dimethyl In the methanol solution of imidazole, after reacting for 5min, let stand for 24h. The precursor ZIF-67 was prec...

Embodiment 2

[0034] Example 2: 0.05g of Co-N-MCF was added to 0.5 mol L -1 FeCl 3 solution, and then the mixed solution of the two was magnetically stirred, rotated for 10 minutes, then centrifuged, washed with deionized water for 3 times, and dried at 80° C. for 24 hours. The obtained product was heated to 750° C. at 5° C. / min for 2 hours under a nitrogen atmosphere, and sample 2 was obtained by pyrolysis. All the other preparation methods are with the method described in Example 1; the test method is with the method described in Example 1.

Embodiment 3

[0035] Example 3: ZIF-67 was heated to 750° C. at 5° C. / min for 2 hours under a nitrogen atmosphere, and Co-N-MCF was obtained by pyrolysis. The test method is as shown in Example 1.

[0036] figure 2 The XRD patterns of the samples obtained in Example 1, Example 2 and Example 3, the Co / N-MCF diffraction peak obtained after pyrolysis is completely consistent with the diffraction peak of Co (PDF#15-0806), confirming that ZIF-67 The Co ions in can be transformed into Co nanoparticles at high temperature. However, no matter the subsequent high-gravity rotating packed bed strategy or the magnetic stirring method to load Fe onto Co / N-MCF, the obtained Fe / Co / N-MCF and Fe / Co / N-MCF(M) catalysts only obtained from The presence of Co nanoparticles was detected in the XRD pattern. This proves that the relatively low Fe content makes it difficult to form nanoparticles.

[0037] image 3 Be the specific surface area and the pore size distribution of the sample obtained in embodiment ...

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Abstract

The invention belongs to the technical field of electrocatalysis, and provides a Fe / Co-N-MCF composite catalyst for a fuel cell and a preparation method of the Fe / Co-N-MCF composite catalyst. The preparation method comprises the following steps: synthesizing ZIF-67 by taking cobalt chloride hexahydrate and dimethylimidazole as raw materials, and pyrolyzing in a nitrogen atmosphere to obtain Co-N-MCF; adding the Co-N-MCF and a ferric trichloride solution into a supergravity rotating packed bed together, uniformly adsorbing iron ions on the Co-N-MCF, and pyrolyzing in a nitrogen atmosphere to obtain the composite catalyst. According to the invention, the supergravity technology is introduced into the preparation process of the ORR catalyst for the first time, the ORR kinetics of the composite catalyst is significantly enhanced, and the half-wave potential of the composite catalyst exceeds 31 mV of a commercial Pt / C catalyst. By means of the technical scheme, the catalyst has more effective oxygen reduction catalytic active sites, adsorption and further catalytic reduction of molecular oxygen are promoted, and the ORR activity is remarkably improved; the preparation process is simple,the cost is low, and the supergravity rotating packed bed equipment can meet large-scale production.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, is mainly applied to fuel cells, and in particular relates to a Fe / Co-N-MCF composite catalyst for fuel cells and a preparation method thereof. Background technique [0002] At present, with the excessive development and utilization of traditional fossil fuels, environmental pollution and global energy crisis are becoming more and more serious. In order to solve this problem, we urgently need to find new clean energy and energy conversion devices. Among them, fuel cells have attracted much attention as an efficient and environmentally friendly energy conversion device, and are considered to be the fourth type of power generation technology after hydropower, thermal power and nuclear power. However, the high cost of Pt-based oxygen reduction (ORR) catalysts in fuel cell cathodes severely restricts the commercialization of fuel cells. Therefore, there is an urgent need to research and dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86
CPCH01M4/9041H01M4/9083H01M4/8652Y02E60/50
Inventor 吴光平师锦华王超袁志国郭丽
Owner ZHONGBEI UNIV
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