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Fuel batter with proton exchange film electric pole catalyze layer and producing thereof

A technology of fuel cell electrodes and proton exchange membranes, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor catalyst contact and low utilization rate of catalysts, and achieve the effect of improving battery performance

Active Publication Date: 2008-03-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to overcome the problems of poor contact between the polymer organic proton conductor (such as Nafion) and the catalyst and the low utilization rate of the catalyst in the above-mentioned fuel cell electrode catalyst layer, the present invention uses a heteropolyacid salt with a stronger proton-conducting ability to replace part of the polymer organic proton conductor (such as Nafion), enhance the contact between the proton conductor and the catalyst, and improve the utilization of the catalyst in the electrode

Method used

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  • Fuel batter with proton exchange film electric pole catalyze layer and producing thereof
  • Fuel batter with proton exchange film electric pole catalyze layer and producing thereof
  • Fuel batter with proton exchange film electric pole catalyze layer and producing thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 3mg of Pt / C catalyst (46.2wt%Pt, Japan Tanaka company) and a certain amount of cesium hydrogen phosphomolybdate (Cs 2.5 h 0.5 PMo 12 o 40 , referred to as Cs2.5), 0.5ml of isopropanol solution containing 0.5% Nafion in mass concentration, mixed with 2ml of isopropanol, and ultrasonically stirred at room temperature, wherein Pt / C and Cs 2.5 h 0.5 PMo 12 o 40 The mass ratio is 4:1. After stirring for 1 hour, take 10 microliters of the suspension and apply it to a glassy carbon electrode (the effective area is 0.1256cm 2 ) was dried at room temperature to obtain a working electrode. The platinum mesh was used as the counter electrode, the Ag / AgCl (saturated potassium chloride) electrode was used as the reference electrode, and the 0.5M sulfuric acid solution was used as the electrolyte to measure the cyclic voltammetry curve of the working electrode, as shown in Figure 1. The scan rate is 50mV / s. By calculating the area of ​​the hydrogen desorption peak of Pt, 210...

Embodiment 2

[0044] 10mg catalyst Pt / C (46.2wt%Pt, Japan Tanaka company) and a certain amount of Nafion, cesium hydrogen phosphomolybdate (Cs 2.5 h 0.5 PMo 12 o 40 , referred to as Cs2.5) and isopropanol are mixed to make a uniform suspension under ultrasonic vibration, wherein the mass ratio of Pt / C catalyst, organic proton conductor Nafion, heteropoly acid salt Cs2.5, and isopropanol is 10:2.5:2.5:500. Then, spray this suspension on Nafion  The two sides of NRE-212 are used as the catalytic layer, dried in air at 80°C for 2 hours, and then hot-pressed with the hydrophobically treated carbon paper diffusion layer at 140°C to obtain a three-in-one membrane electrode. The amount of Pt used in the catalytic layer is 0.07mg / cm 2 . Add the anode and cathode flow field plates on both sides of the three-in-one membrane electrode, the current collector plate and the end plate to form a single cell. The effective area of ​​the electrode is about 5cm 2 . The cathode and anode are respecti...

Embodiment 3

[0048] 10mg catalyst Pt / C (46.2wt%Pt, Japan Tanaka company) and a certain amount of Nafion, cesium hydrogen phosphotungstate (Cs 2.5 h 0.5 PW 12 o 40 .abbreviated as WCs2.5) and isopropanol, and made into a homogeneous suspension under ultrasonic vibration, wherein the mass ratio of Pt / C catalyst, organic proton conductor Nafion, heteropoly acid salt WCs2.5, and isopropanol is 5:5:5:500. Then, apply this suspension on Nafion  The two sides of NRE-212 are used as the catalytic layer, dried at 130°C under the protection of nitrogen for 0.5 hours, and then hot-pressed with the hydrophobically treated carbon paper diffusion layer at 140°C to obtain a three-in-one membrane electrode. The amount of Pt used in the catalytic layer is 0.07mg / cm 2 . The evaluation battery was assembled according to the method of Example 2, and the V-i curve of the membrane electrode was measured under the same conditions, as shown in FIG. 4 .

[0049] Comparative example is the same as embodimen...

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Abstract

The invention relates to a proton exchanging membrane fuel cell electrode, concretely, a proton exchanging membrane fuel cell electrode catalysis layer and its device, which comprises catalyzer, organic proton conductor and heteropoly hydrochloric acid with a mass ratio of 10:1 to 10:1 to 10. The method is to mix the insoluble heteropoly hydrochloric acid into electrode catalysis layer, and partly replace macromolecule electrolyte like Nafion, which increases three phase reactor interface of the electrode catalysis layer, ensures the active component in electrode catalysis layer good contact with proton conductor and electron conductor and improves the performance of cell. Besides, heteropoly hydrochloric acid can transmit proton and increase the catalytic activity of platinum catalyzer, which can improve the performance of cell.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell electrode, in particular to a proton exchange membrane fuel cell electrode catalyst layer and its preparation. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) is a power generation device that directly converts the chemical energy in fuel and oxidant into electrical energy through an electrochemical reaction. It uses a solid polymer membrane with good proton conductivity as the electrolyte. One side of the membrane is an anode composed of a catalytic layer and a gas diffusion layer, and the other side is a cathode composed of a catalytic layer and a gas diffusion layer. The layer is between the gas diffusion layer and the proton exchange membrane, and the electrode catalyst layer is the place for electrochemical reactions. The anode, solid polymer electrolytic membrane and cathode are pressed together to form the core component of PEMFC—membrane electrode three-in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M4/92
CPCY02E60/50
Inventor 邵志刚张华民刘波李明强衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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