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Fuel cell catalyst taking conductive ceramic boron carbide as supporter and preparation method thereof

A technology of fuel cells and conductive ceramics, applied in the direction of physical/chemical process catalysts, catalyst carriers, chemical instruments and methods, etc., can solve the problems that have not yet been reported on proton exchange membrane fuel cell catalysts, achieve high methanol formic acid oxidation ability, synthesis The process is simple, the effect of wear-resistant and conductive properties

Inactive Publication Date: 2011-06-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there is no relevant report on proton exchange membrane fuel cell catalysts based on nano-conductive ceramic boron carbide.

Method used

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  • Fuel cell catalyst taking conductive ceramic boron carbide as supporter and preparation method thereof
  • Fuel cell catalyst taking conductive ceramic boron carbide as supporter and preparation method thereof
  • Fuel cell catalyst taking conductive ceramic boron carbide as supporter and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] Mix 150 mL of pure ethylene glycol solution with 50 mL of 1.4 mg / mL HO 2 PtCl 6 ·6H 2 A solution mixed in O, in N 2Stir well under protection to form a uniform mixed solution, then add 2 mol / liter sodium hydroxide solution drop by drop to adjust the pH value of the mixed solution to 9-13, then heat the mixed solution to 130-160°C in an oil bath, and condense After refluxing for 2 to 5 hours, the color of the solution gradually changed from light yellow to dark brown, and a stable Pt colloid was obtained. Weigh 280 mg of boron carbide powder with an average particle size of 50 nanometers, add it to 100 ml of ethylene glycol solution for ultrasonic dispersion for 30-60 minutes, then add it to the above stable Pt colloid solution, stir for 8-10 minutes Hour. After filtering and washing with aqueous alcohol solution, Pt / B 4 C catalyst. Compared with the carbon support catalyst Pt / C, the active area is increased by 30%, the oxidation potential of carbon monoxide is red...

Embodiment 2

[0039] Get 280 mg of boron carbide powder with an average particle diameter of 50 nanometers, disperse it into 100 ml of ethylene glycol solution and ultrasonically disperse it for 30 to 60 minutes to prepare a boron carbide solution for use. Mix 150 ml of ethylene glycol solution with 50 ml 1.4 mg / ml H 2 PtCl 6 ·6H 2 The solution of O is mixed, and the above boron carbide solution is mixed with H 2 PtCl 6 ·6H 2 A solution mixed in O, in N 2 Stir under protection for 10-20 minutes to form a uniform mixed solution, then add 2 mol / L NaOH solution drop by drop to adjust the pH value of the mixed solution to 9-13, and then heat the mixed solution to 130-160°C in an oil bath, Condensate and reflux for 2-5 hours, stop heating and continue stirring for 8-10 hours. After filtering and washing with alcohol aqueous solution, Pt / B 4 C catalyst. Compared with the traditional carbon support Pt / C catalyst, the active area is increased by 21%, the carbon monoxide oxidation potential ...

Embodiment 3

[0041] Take 1.4 mg / ml PdCl in concentrated hydrochloric acid 2 Mix 50 ml of the solution with 150 ml of ethylene glycol in N 2 Stir under protection for 10-20 minutes to form a uniform mixed solution, and then dropwise add 2 mol / liter sodium hydroxide solution to adjust the pH value of the mixed solution to 8-9, and weigh 280 mg of Boron carbide powder is added to 100 ml of ethylene glycol solution and ultrasonically dispersed for 30 to 60 minutes, and it is mixed with PdCl 2 Mix the solutions, reflux at 80-90°C for 2-3 hours, stop heating and continue stirring for 8-10 hours, filter and wash with alcohol aqueous solution to obtain Pd / B 4 C catalyst. Compared with the traditional carbon-supported Pd / C catalyst, the active area is increased by 26%, the carbon monoxide oxidation potential is reduced by 0.043 volts, and the peak value of the oxidation current is increased by 17%.

[0042] Preparation of fuel cell chip CCM: add the prepared catalyst to deionized water and 5% pe...

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Abstract

The invention discloses a fuel cell catalyst taking conductive ceramic boron carbide as a supporter and a preparation method thereof. Compared with the traditional carbon supporter catalyst, the fuel cell catalyst takes the conductive ceramic boron carbide as the supporter, so that the catalyst has the advantages of higher electrochemical activity area, higher capability on resisting carbon monoxide poisoning and higher oxidation resistance. The preparation method of the catalyst comprises the following steps: preparing a stable nanoparticle platinum or platinum alloy colloid in advance; supporting the nanoparticle platinum or platinum alloy colloid on a boron carbide supporter; and preparing the fuel cell catalyst which takes the boron carbide as the supporter. The prepared catalyst is made into a fuel cell MEA (membrane electrode assembly) which has better electrical output performance and cell stability.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst used in a fuel cell, which is characterized in that the carrier used in the catalyst is conductive nano-ceramic boron carbide. The invention also relates to a preparation method of the catalyst. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC), as a kind of clean energy with high working efficiency, environmental friendliness and fast start-up at room temperature, has become one of the research hotspots in the field of energy. For its research, most of the work focuses on improving performance, reducing costs and improving durability. Among them, the durability of PEMFC is a major bottleneck hindering its commercialization. This is because the catalyst mainly uses a Pt noble metal catalyst, and the reduction of catalyst activity and the degradation of the proton exchange membrane during the operation of the fuel cell are often important reasons for the low durabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88B01J32/00B01J27/22
CPCY02E60/50
Inventor 木士春吕海峰潘牧
Owner WUHAN UNIV OF TECH
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