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Fuel battery catalyst modified by metal-organic framework and preparation method

An organic framework and fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor anti-toxicity, high price, and CO poisoning, and achieve reduced modification costs, reduced dependence, and excellent catalytic activity Effect

Active Publication Date: 2018-06-01
上海中海龙高新技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Pt or Au catalysts still face the problems of low reserves, high price, and poor poison resistance.
[0007] Facing the problem that traditional catalysts are difficult to effectively solve the problem of CO poisoning, how to develop a catalyst that can effectively increase the catalytic and adsorption capacity of CO in the gas diffusion layer, so as to reduce the dependence on Pt and reduce the cost of fuel cells, aiming at suppressing the poisoning of Pt catalysts The research has very important practical significance

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Mix 3 parts of iron powder with 20 parts of nitric acid in parts by weight. After the iron powder is completely dissolved, add 2 parts of benzoic acid and 1 part of hydrofluoric acid, stir evenly and carry out hydrothermal treatment. The hydrothermal temperature is controlled at 98°C , after centrifugation and precipitation, the speed of centrifugation is controlled at 500rpm, the precipitation is filtered out, and then freeze-dried, the treatment temperature of freeze-drying is -40°C, and the air pressure is controlled at 700Pa to obtain metal-organic framework crystal materials;

[0034](2) adding the metal-organic framework crystal material into a dry-process ball mill, the media balls of the ball mill are corundum media, the speed of the ball mill is controlled at 800 rpm, and the ball mill is pulverized to obtain a metal-organic framework powder with a particle size of 300 μm and a skeleton structure;

[0035] (3) Coat the first surface of the carbon fiber layer...

Embodiment 2

[0038] (1) Mix 7 parts of iron powder with 18 parts of nitric acid in parts by weight. After the iron powder is completely dissolved, add 2 parts of phthalic acid and 1 part of hydrofluoric acid, stir well and then carry out hydrothermal treatment. The hydrothermal temperature is controlled at 85 ℃, after centrifugation and precipitation, the speed of centrifugation is controlled at 2000rpm, the precipitation is filtered out, and then freeze-dried, the treatment temperature of freeze-drying is -34℃, the air pressure is controlled at 10Pa, and the metal-organic framework crystal material is obtained;

[0039] (2) adding the metal-organic framework crystal material into a dry-process ball mill, the media balls of the ball mill are corundum media, the speed of the ball mill is controlled at 800 rpm, and the ball mill is pulverized to obtain a metal-organic framework powder with a particle size of 120 μm and a skeleton structure;

[0040] (3) Coat the first surface of the carbon fi...

Embodiment 3

[0043] (1) Mix 5 parts of iron powder with 20 parts of nitric acid in parts by weight. After the iron powder is completely dissolved, add 3 parts of phenylacetic acid and 1 part of hydrofluoric acid, stir well and then carry out hydrothermal treatment. The temperature of the hydrothermal treatment is controlled at 88°C , after centrifugation and precipitation, the speed of centrifugation is controlled at 1300rpm, the precipitation is filtered out, and then freeze-dried, the treatment temperature of freeze-drying is -20°C, and the air pressure is controlled at 10Pa to obtain metal-organic framework crystal materials;

[0044] (2) adding the metal-organic framework crystal material into a dry-process ball mill, the media balls for ball milling are corundum media, and the speed of the ball mill is controlled at 2000rpm to obtain a metal-organic framework powder with a particle size of 100 μm and a skeleton structure;

[0045] (3) Coat the first surface of the carbon fiber layer wi...

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Abstract

The invention provides a fuel battery catalyst modified by a metal-organic framework and a preparation method. The preparation method comprises the following steps of uniformly mixing iron powder, benzoic acid, hydrofluoric acid and nitric acid, performing hydrothermal treatment at low temperature, filtering, and drying, so as to obtain a granular crystal matter; performing dry type ball milling,and crushing crystals into micrometer-level powder; performing hot pressing and compounding with a Pt / C (platinum / carbon) catalyst, and uniformly embedding the powder to the back surface of a carbon fiber carrier, so as to form a dot array adsorption layer. The preparation method has the advantages that the metal iron and the benzoic acid organic matters are reacted and are compounded with the carbon fiber carrier to form the dot array adsorption layer; by reducing Fe<3+> into Fe<2+> in a skeleton structure, the selective catalyzing and adsorbing effect is realized for CO (carbon monoxide) adsorbate containing phi bonds; the catalyzing and adsorbing amount of CO in a gas diffusion layer is effectively increased, the risk of catalyst poisoning is reduced, and the reaction activity is improved.

Description

technical field [0001] The invention relates to the field of fuel cell materials, in particular to a metal-organic framework modified fuel cell catalyst and a preparation method. Background technique [0002] Since traditional fossil fuels are non-renewable and cause serious environmental pollution during use, seeking environmentally friendly renewable energy is a severe task facing mankind in the 21st century. Fuel cell (Fuel cell) is a new type of energy technology, which directly converts the chemical energy of fuel into electrical energy through electrochemical reactions. The fuel used is hydrogen-rich substances such as hydrogen, methanol and hydrocarbons, which has no pollution to the environment and has High energy efficiency and high power density, therefore, fuel cells have broad application prospects. [0003] Proton exchange membrane fuel cell (Proton Exchange Membrane Fuel Cell, PEMFC)) is following alkaline fuel cell (AFC), phosphoric acid fuel cell (PAFC), mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/92B82Y30/00
CPCB82Y30/00H01M4/8663H01M4/8839H01M4/8875H01M4/926Y02E60/50
Inventor 陈庆曾军堂
Owner 上海中海龙高新技术研究院
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