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Membrane electrode of fuel cell and preparation method and application of membrane electrode

A fuel cell membrane and electrode technology, used in fuel cells, battery electrodes, circuits, etc., can solve the problems of proton exchange membrane swelling and deposition time, low catalyst active surface, etc., and achieve easy large-scale production, large electrochemical active area, Environmental pollution-free effect

Inactive Publication Date: 2018-02-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepared catalytic layer structure should not only retain the advantages of the existing catalytic layer structure, but also solve the problems of swelling of the proton exchange membrane during the preparation process, long deposition time, and low catalyst active surface

Method used

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  • Membrane electrode of fuel cell and preparation method and application of membrane electrode
  • Membrane electrode of fuel cell and preparation method and application of membrane electrode
  • Membrane electrode of fuel cell and preparation method and application of membrane electrode

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Experimental program
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Effect test

Embodiment 1

[0029](1) Add 1 mg of carbon powder, 1.25 mg of carbon powder loaded with platinum nanoparticles (commercial carbon-supported platinum catalyst, 20 wt% Pt) and 2.5 mg of Nafion solution (10% Nafion alcohol solution by mass fraction) to 2 mL of isopropyl In the alcohol solution, ultrasonic treatment makes the solution evenly dispersed, and then it is evenly sprayed on the polytetrafluoroethylene (PTFE) transfer medium, so that a layer of uniform matrix is ​​formed on the PTFE transfer medium (area 3.3×3.3cm 2 ), and finally dried at 50°C for 1 hour.

[0030] (2) The PTFE transfer medium with the matrix is ​​fixed in an aqueous solution containing chloroplatinic acid and formic acid, wherein the aqueous solution contains chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) 5.34mg, 1mL of formic acid (mass fraction 88%) and 80mL of water. It was then left to stand at room temperature for 10 hours to deposit 0.2 mg / cm 2 platinum. Afterwards, the above solution was replaced, the transfer ...

Embodiment 2

[0037] (1) Add 1 mg of carbon powder, 1.5 mg of carbon powder loaded with platinum nanoparticles (self-made, 33 wt% Pt) and 2.8 mg of Nafion solution (Nafion alcohol solution with a mass fraction of 10%) to 2 mL of isopropanol, and ultrasonically Process to disperse the mixed solution evenly, and then spray it evenly on the polytetrafluoroethylene (PTFE) transfer medium to form a uniform matrix on the PTFE transfer medium (area 3.3×3.3cm 2 ), and finally dried at 50°C for 1 hour.

[0038] (2) The PTFE transfer medium with the matrix is ​​fixed in an aqueous solution containing chloroplatinic acid and formic acid, wherein the aqueous solution contains chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) 5.34mg, 1mL of formic acid (mass fraction 88%) and 80mL of water. It was then left to stand at room temperature for 10 hours to deposit 0.2 mg / cm 2 platinum. Afterwards, the above solution was replaced, the transfer medium was repeatedly soaked and rinsed with deionized water, and fina...

Embodiment 3

[0043] (1) Add 1 mg of carbon powder, 1.25 mg of carbon powder loaded with platinum nanoparticles (commercial carbon-supported platinum catalyst, 20 wt% Pt) and 2.5 mg of Nafion solution (10% Nafion alcohol solution by mass fraction) to 2 mL of isopropyl In the alcohol solution, ultrasonic treatment makes the solution evenly dispersed, and then it is evenly sprayed on the polytetrafluoroethylene (PTFE) transfer medium, so that a layer of uniform matrix is ​​formed on the PTFE transfer medium (area 3.3×3.3cm 2 ), and finally dried at 50°C for 1 hour.

[0044] (2) The PTFE transfer medium with substrate is fixed in the aqueous solution containing chloroplatinic acid and formic acid, wherein the aqueous solution contains potassium chloroplatinite (K 2 PtCl 4 ) 5 mg, 1 mL of ascorbic acid (0.4 mol / L) and 80 mL of water. It was then left to stand at room temperature for 10 hours to deposit 0.2 mg / cm 2 platinum. Afterwards, the above solution was replaced, the transfer medium wa...

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Abstract

The invention discloses a preparation method of a membrane electrode of a fuel cell. The method comprises the steps of coating a transfer medium with a substrate layer; carrying out in-situ reduction-deposition of platinum nanoparticles on the substrate layer and then coating the platinum nanoparticles with a layer of proton conducting polymer to form an electrode catalyst layer; and finally transferring the catalyst layer to a proton exchange membrane by adopting a heat transfer process to prepare a membrane electrode. The invention further discloses the membrane electrode of the fuel cell and an application of the membrane electrode on a cathode or an anode of a proton exchange membrane fuel cell. The problem of contradiction between reduction time and electrochemical active area in thein-situ deposition process of platinum is relatively well solved and the yield of heat transfer is improved. The membrane electrode has the beneficial effects of high catalyst activity and utilizationrate, large electrochemical active area, low gas transmission impedance in the catalyst layer and the like, and is low in production cost, simple and fast in process and high in yield, and massive production is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a fuel cell membrane electrode and its preparation method and application. Background technique [0002] A fuel cell is a clean, efficient, and long-life power generating device. Compared with conventional power generation technologies, fuel cells have great advantages in terms of efficiency, safety, reliability, flexibility, cleanliness, and operability, and their application prospects are very broad. As a kind of fuel cell, proton exchange membrane fuel cell also has the advantages of low operating temperature, high specific energy, long service life, fast response speed, and no electrolyte leakage. Very good application prospects. The core component of a proton exchange membrane fuel cell is a membrane electrode (Membrane Electrode Assembly, MEA), which is composed of a polymer membrane with proton conductivity and electrodes (including anode and cathode). Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/1004H01M8/1007H01M8/1011
CPCH01M4/8663H01M4/8814H01M4/885H01M4/8875H01M8/1004H01M8/1007H01M8/1011Y02E60/50Y02P70/50
Inventor 隋升苏凯华
Owner SHANGHAI JIAO TONG UNIV
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