Catalyst for negative electrode material of hydrogen-air fuel battery and preparation method thereof

A fuel cell cathode and catalyst technology, applied to battery electrodes, circuits, electrical components, etc., can solve the problems of high price, poor catalyst stability, and no reports

Active Publication Date: 2018-03-02
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Platinum carbon, as the most widely used hydrogen-air fuel cell catalyst, is not only expensive but also has poor catalyst stability. So far, the solution is to use platinum-based alloys or non-platinum catalysts instead of platinum-carbon catalysts to reduce costs and improve stability. Now the most studied non-platinum catalysts are new car

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  • Catalyst for negative electrode material of hydrogen-air fuel battery and preparation method thereof
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  • Catalyst for negative electrode material of hydrogen-air fuel battery and preparation method thereof

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Example Embodiment

[0035] Another aspect of the present invention provides a method for preparing a Group VIII polyatom-dispersed catalyst. In one embodiment, the preparation method of the present invention includes the following steps:

[0036] Step 1. Add the methanol solution of the first group VIII atomic compound and the methanol solution of the Zn compound (where the molar ratio of the first group VIII atomic compound to the Zn compound is 1 / 1 to 1 / 10) is added to the organic ligand methanol In the solution, or just add the methanol solution of the Zn compound to the methanol solution of the organic ligand, dissolve while ultrasonic, and then stir the mixed solution overnight;

[0037] Step 2. Wash the mixed solution obtained in step 1 with methanol centrifugally for 3-5 times, and dry it in an oven at 60°C-90°C overnight to obtain a solid powder containing the first group VIII atoms and Zn atoms and only containing Zn. Atomic solid powder;

[0038] Step 3. The solid powder containing the first...

Example

[0058] Preparation Example 1

[0059] Preparation of Fe, Co diatomic dispersion catalyst:

[0060] (1) Prepare 0.125mol / L zinc nitrate hexahydrate methanol solution, 0.125mol / L cobalt nitrate hexahydrate methanol solution, 0.5mol / L dimethylimidazole methanol solution; then 15ml 0.125mol / L hexahydrate The zinc nitrate methanol solution and 15 ml of 0.125mol / L cobalt nitrate hexahydrate methanol solution were mixed and added to 30 ml of dimethylimidazole methanol solution, dissolved while ultrasonic, and then the mixed solution was stirred overnight;

[0061] (2) Centrifugally wash the obtained mixed solution with methanol for 3-5 times, and dry it in an oven at 70°C overnight to obtain a solid powder;

[0062] (3) Disperse the metal organic framework obtained above in n-hexane, and then add 50ul of a ferric chloride aqueous solution with a concentration of 50mg / ml, stir for 1-3h, and wash and dry;

[0063] (4) Put the obtained solid powder into a porcelain boat, then put the porcelain b...

Example

[0064] Preparation Example 2

[0065] Preparation of Fe and Co diatomic dispersion catalysts with different atomic ratios

[0066] (1) Prepare 0.125mol / L zinc nitrate hexahydrate methanol solution, 0.125mol / L cobalt nitrate hexahydrate methanol solution, 0.5mol / L dimethylimidazole methanol solution; then 15ml 0.125mol / L hexahydrate The zinc nitrate methanol solution and 15 ml of 0.125mol / L cobalt nitrate hexahydrate methanol solution were mixed and added to 30 ml of dimethylimidazole methanol solution, dissolved while ultrasonic, and then the mixed solution was stirred overnight;

[0067] (2) Centrifugally wash the obtained mixed solution with methanol for 3-5 times, and dry it in an oven at 70°C overnight to obtain a solid powder;

[0068] (3) Disperse the metal-organic framework obtained above in n-hexane, and then add 50 ul of iron chloride aqueous solution with a concentration of 10 mg / ml or 50 ul of iron chloride aqueous solution with a concentration of 100 mg / ml, and wash and dr...

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Abstract

The invention discloses a catalyst for a negative electrode material of a hydrogen-air fuel battery and a preparation method thereof. In the invention, according to the catalyst, group VIII atoms anda Zn atom are coordinated together with an organic ligand to form a metal organic framework, then at least one additional group VIII atom is adsorbed by a double-solvent method, next a high-temperature pyrolysis reaction is performed in an inert gas atmosphere, the organic ligand is coordinated to form a non-metal heteroatom-doped carbon carrier, and the group VIII atoms and a non-metal heteroatomare interacted, are coated in a carbon layer and exist in a multi-atom form. Based on the metal organic framework as a precursor, the required catalyst can be prepared only by the high-temperature pyrolysis method. The preparation method is simple and feasible, and is a universal method for synthesis of multiple atoms. The group VIII multi-atom dispersed catalyst provided by the invention has good thermal stability and has excellent catalytic activity on oxygen reduction catalysis of a negative electrode of the hydrogen-air fuel battery.

Description

technical field [0001] The invention belongs to the field of hydrogen-air fuel cell technology inventions, and in particular relates to a method for preparing a VIII group polyatomic dispersed catalyst used for hydrogen-air fuel cell cathode materials. Background technique [0002] With the development of human society, issues such as global energy consumption and climate change have aroused widespread concern, so it is imminent to find alternative clean energy. Currently, new energy sources being developed include solar energy, wind energy, and fuel cells. Among them, the hydrogen-air fuel cell is a device that directly converts chemical energy into electrical energy through the electrode reaction of hydrogen and air to generate water. It does not need to be charged and does not generate exhaust gas. It is considered as the preferred clean energy power generation technology in the 21st century. However, the cathode oxygen reduction kinetics of hydrogen-air fuel cells is s...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9008Y02E60/50
Inventor 王晶吴宇恩李亚栋
Owner UNIV OF SCI & TECH OF CHINA
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