Method for preparing platinum gradient-distribution catalyst layer structure of proton exchange membrane fuel cell

A technology of proton exchange membrane and gradient distribution, applied to battery electrodes, structural parts, circuits, etc., can solve the problems of ineffective utilization, inability to be fully utilized, and non-continuous gradient distribution of the catalyst layer, so as to achieve high utilization rate , large three-phase interface and short distance

Active Publication Date: 2015-07-15
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the catalyst layer prepared by this method is not a continuous gradient distribution, and there is still a problem that part of the catalyst is covered by the electrolyte resin and cannot be fully utilized.
[0006] Therefore, the proton exchange membrane fuel cell catalyst layer and multi-layer catalyst layer structure prepared by the prior art method are distributed in a discontinuous gradient, and there is a problem that part of the catalyst is coated by the electrolyte resin and cannot be effectively utilized. of technicians are working to develop a method for the preparation of catalytic layer structures for proton exchange membrane fuel cells

Method used

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  • Method for preparing platinum gradient-distribution catalyst layer structure of proton exchange membrane fuel cell
  • Method for preparing platinum gradient-distribution catalyst layer structure of proton exchange membrane fuel cell
  • Method for preparing platinum gradient-distribution catalyst layer structure of proton exchange membrane fuel cell

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Embodiment 1

[0035](1) 5 mg of carbon-supported platinum catalyst (wherein the mass content of platinum is 20%) and 12.5 mg of Nafion solution (10% alcohol solution by mass fraction) are added in 1 ml of isopropanol, and the mixed solution is dispersed evenly by ultrasonic treatment , and then evenly spray it on the Nafion electrolyte membrane to form a uniform solution layer on the membrane (area 3.3×3.3cm 2 ), and then dried at 50° C. for 30 minutes to form a uniform matrix layer on the membrane, that is, a proton exchange membrane with a carbon-supported platinum matrix is ​​obtained.

[0036] (2) The described proton exchange membrane with carbon-supported platinum matrix is ​​immersed in the solution containing chloroplatinic acid and formic acid, wherein containing 4mg chloroplatinic acid (H2PtCl6H2O), 1ml formic acid (mass fraction 88%) and 40ml water. It was then left at room temperature for 48 hours to deposit 0.15 mg / cm 2 platinum. After the reaction, the proton exchange membr...

Embodiment 2

[0043] The difference from the above-mentioned Example 1 is that 2.5mg of carbon-supported platinum catalyst (wherein the mass content of platinum is 20%) and 6.25mg of Nafion solution (alcoholic solution with a mass fraction of 10%) is weighed, and all the other processes are the same as in the above-mentioned examples 1.

[0044] Figure 4 The polarization performance (I-V) curve of a fuel cell assembled using the catalytic layer prepared in this example as a cathode electrode. From Figure 4 It can be seen that the highest power density of the battery is 0.41W / cm 2 , at 0.3V, the current density reaches 0.97A / cm 2 .

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Abstract

The invention discloses a method for preparing a platinum gradient-distribution catalyst layer structure of a proton exchange membrane fuel cell. The method comprises the following steps of 1, uniformly spraying a layer of a low-platinum load capacity carbon-supported platinum catalyst as a matrix on a polymer electrolyte membrane, 2, dipping the polymer electrolyte membrane with the matrix layer into a platinum precursor-containing solution so that platinum is reduced by a weak reductant and platinum nano-wires form on the matrix layer, 3, uniformly spray-coating a layer of an electrolyte resin solution on the platinum nano-wires to obtain a three-phase interface, and 4, carrying out hot-pressing with a diffusion layer to obtain a membrane electrode.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, in particular to a method for preparing a catalytic layer structure of a proton exchange membrane fuel cell. Background technique [0002] Fuel cell power generation is recognized as the fourth power generation method after thermal power generation, hydropower generation, and nuclear power generation. The proton exchange membrane fuel cell (PEMFC), which has the advantages of high efficiency, high power density, low temperature operation and no pollution, is regarded as a better candidate for providing energy sources for automobiles, small and medium-sized power stations and mobile devices. The core component of a proton exchange membrane fuel cell is a membrane electrode (Membrane Electrode Assembly, MEA), which is composed of an anode, a cathode and a polymer electrolyte membrane (or proton exchange membrane). Layer (reaction layer) composition: the diffusion layer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 隋升苏凯华姚先拥毛利伟何岸
Owner SHANGHAI JIAOTONG UNIV
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