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Composition, compound body, and method for raising utilization ratio of catalyst

A utilization rate and composite technology, applied in chemical instruments and methods, catalyst carriers, chemical/physical processes, etc., can solve problems such as phase separation, catalyst particles evacuating polymers, cracks, etc.

Active Publication Date: 2007-12-26
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the research on the preparation of catalyst slurry only considered adding dispersion energy to the equipment, adjusting the type and viscosity of the solvent, adjusting the solubility between the polymer and the solvent, or using a surfactant, but did not consider the relationship between the polymer and the catalyst particles. The problems faced by the adsorptive properties include: (1) Catalyst particles are easy to aggregate and discharge polymers; (2) Phase separation and cracks occur in the coating / drying process; the only solution is to solve the adsorptive properties of polymers and catalysts. Therefore, solving the problem of low utilization rate of catalysts from the force between polymers and catalyst molecules has become a topic worthy of research

Method used

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  • Composition, compound body, and method for raising utilization ratio of catalyst
  • Composition, compound body, and method for raising utilization ratio of catalyst
  • Composition, compound body, and method for raising utilization ratio of catalyst

Examples

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Embodiment 1

[0037] Embodiment 1, prepare electrode with the method of the present invention

[0038] The process of preparing an electrode by using the method for improving the utilization rate of fuel cell catalyst of the present invention is shown in FIG. 5 . First, disperse Pt and coupling agent GPTMS in nBA with ultrasonic waves to form Pt / nBA and GPTMS / nBA, and mix Pt / nBA and GPTMS / nBA according to the ratio of Pt:GPTMS=100:2, and heat to 80°C Disperse with ultrasound. Next, according to Pt: Nafion  = Add Nafion at a ratio of 4:1  / EG, using ultrasonic waves to precipitate the reacted Pt-GPTMS / EG in the lower EG, and the supernatant liquid is excess GPTMS. After separating and removing the excess GPTMS, heat it to 80°C and disperse it with ultrasonic waves to obtain ProductPt-GPTMS-Nafion  / EG. Finally, the product is subjected to an electrode manufacturing process, and the prepared electrode is further prepared into a thin film electrode module (MEA).

Embodiment 2

[0039] Embodiment two, catalyst slurry DLS test

[0040] The composition prepared in Example 1 was used to measure the particle size of the slurry using a dynamic light scattering instrument (Dynamic Light Scattering, DLS).

[0041] According to Figure 6, when the solvent is water, it can be found that the slurry with coupling agent (Coupling Agent) is more than the slurry without coupling agent (Previous Method), and its analysis value is from a larger particle size to a smaller particle size offset. This is because the coupling agent is bonded to the catalyst to disperse the catalyst evenly, making the particle size of the distribution smaller than that of the catalyst without the coupling agent, and the catalyst without the coupling agent will aggregate to cause the particles to become larger. It can be seen that, by adding coupling agent in the present invention, the catalyst can be evenly dispersed, so that the exposed active surface area of ​​the catalyst is increased t...

Embodiment 3

[0042] Embodiment 3, half-cell test

[0043] The PtRu / black anode slurry processed according to the method of Example 1 was made into an anode electrode, and then 10% MeOH and 0.5M H at 40°C 2 SO 4 , a half-cell oxidation reaction test was performed.

[0044] The experimental results are shown in Figure 7. It can be found that when the voltage is 0.6V, the current density of the anode slurry with GPTMS added is about 60% higher than that of the anode slurry without GPTMS, and the GPTMS-K form electrode Electrodes are improved by about 50%. The experimental results show that the catalyst slurry added with coupling agent can indeed promote the utilization rate of the catalyst, so as to improve the performance of the fuel cell.

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Abstract

The invention discloses a composition for raising use ratio of catalyst for fuel cell. The composition includes catalyst, ion macromolecules of proton conduction, and couplant. Using function group B1, the couplant binds catalyst or carrier of catalyst; and using function group B2 the couplant binds ion macromolecules of proton conduction. The invention also discloses corresponding method including following steps: (1) using supersound to break up catalyst; (2) adding couplant to generate bonding to catalyst; and (3) adding high molecular fluoride to generate bonding to couplant so as to form composition of catalyst - couplant - high molecular fluoride in order to form stable dispersion. In step (2), the couplant uses a function group B1 to bond to catalyst, and uses a function group B2 to bind to high molecular fluoride.

Description

technical field [0001] The invention relates to a composition and method for improving the utilization rate of fuel cell catalysts, especially a compound formed by adding a coupling agent to bond catalysts and polymers, and utilizing the original necessary components of the catalyst slurry Composition and method for stably dispersing polymer fluoride to improve fuel cell catalyst utilization. Background technique [0002] Fuel Cell is one of the most feasible methods to solve energy problems and environmental pollution in the future due to its high conversion efficiency, no pollution, and fast refueling. The Direct Methanol Fuel Cell (DMFC), which directly adds methanol as fuel, has great potential in the application of portable electronic products. [0003] In the current development of fuel cell technology, only the precious metal Pt is the most suitable catalyst. However, Pt is the only material that cannot be manufactured through artificial synthesis. Therefore, it is e...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/90H01M4/92H01M8/02C08K5/541C08L101/04B01J32/00H01M8/0202
CPCY02E60/50
Inventor 吴富其蔡丽端薛康琳雍敦元黄秋萍张嵩骏
Owner IND TECH RES INST
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