A kind of fe/co-n-mcf composite catalyst for fuel cell and preparation method thereof

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, and enhance the effect of ORR kinetics

Active Publication Date: 2022-06-07
ZHONGBEI UNIV
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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

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  • A kind of fe/co-n-mcf composite catalyst for fuel cell and preparation method thereof
  • A kind of fe/co-n-mcf composite catalyst for fuel cell and preparation method thereof
  • A kind of fe/co-n-mcf composite catalyst for fuel cell and preparation method thereof

Examples

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Effect test

Embodiment 1

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

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

[0027] (1) Dissolve 5 mmol (1.190 g) of cobalt chloride hexahydrate and 40 mmol (3.284 g) of dimethylimidazole in 100 ml of methanol respectively, and add the methanol solution of cobalt chloride to the dimethyl imidazole at a rotational speed of 500 rpm. In the methanol solution of imidazole, after the reactio...

Embodiment 2

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

Embodiment 3

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

[0036] figure 2 For the XRD patterns of the samples obtained in Example 1, Example 2 and Example 3, the Co / N-MCF diffraction peaks obtained after pyrolysis are completely consistent with the diffraction peaks of Co (PDF#15-0806), confirming that ZIF-67 Co ions in can be converted into Co nanoparticles at high temperature. However, either the subsequent hypergravity rotating packed bed strategy or the magnetic stirring method to load Fe onto Co / N-MCF, the resulting Fe / Co / N-MCF and Fe / Co / N-MCF(M) catalysts are only derived from The presence of Co nanoparticles was detected in the XRD pattern. This proves that the Fe content is relatively low and it is difficult to form nanoparticles.

[0037] image 3 For the specific surface area and pore size distribution of the samples obtained in Example 1 and Example...

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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 thereof. Cobalt chloride hexahydrate and dimethylimidazole were used as raw materials to synthesize ZIF-67, and Co-N-MCF was obtained by pyrolysis under nitrogen atmosphere; Co-N-MCF and ferric chloride solution were added to the high-gravity rotating packed bed together, Iron ions are uniformly adsorbed on Co-N-MCF, and pyrolyzed in a nitrogen atmosphere to obtain a composite catalyst. The present invention introduces the high-gravity technology into the preparation process of ORR catalyst for the first time, which significantly enhances the ORR kinetics of the composite catalyst, and its half-wave potential exceeds that of the commercial Pt / C catalyst by 31mV; the catalyst has more effective oxygen reduction The catalytic active site promotes the adsorption of molecular oxygen and further catalytic reduction, so that the ORR activity is significantly improved; the preparation process is simple, the cost is low, and the high-gravity 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 particularly 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, the problems of environmental pollution and global energy crisis are becoming more and more serious. 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 progress of fuel cell commercialization. Therefore, there is an urgent need to re...

Claims

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Application Information

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Patent Type & Authority Patents(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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