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A method, device and application of light-driven rapid preparation of membrane electrodes

A membrane electrode and light-driven technology, applied in the field of electrochemistry, can solve the problems of increasing membrane electrode preparation cost, complicated process, and expensive price, and achieve the effects of easy mass production of membrane electrodes, simple device structure, and good repeatability

Active Publication Date: 2019-01-29
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

For example: impregnation reduction method - impregnating the Nanfion membrane in Pt(NH 3 ) 4 Cl 2 In solution, Pt(NH 3 ) 4 2+ with H in the membrane + exchange, and then re-immerse the membrane in NaBH 4 In , the Pt is reduced to obtain a membrane electrode (B.-J.Hwang, Mat.Electrochem.Systems, 2001). The catalytic layer prepared by the impregnation reduction method is firmly combined with the membrane, uniform and dense, but the loading of Pt is not easy to control. Preparation It takes a long time and is not easy to mass-produce membrane electrodes; Vacuum sputtering method—using Pt as the cathode and Nafion film as the anode, applying high voltage, Pt is sputtered onto the Nafion film to form a catalyst layer to obtain a membrane electrode (Masaaki Katoh, J.Photoploymer Science and Technology, 2003), the vacuum sputtering method to prepare membrane electrodes can reduce the thickness of the catalyst layer and reduce the amount of Pt, but the process is complicated and expensive, which increases the preparation cost of membrane electrodes

Method used

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  • A method, device and application of light-driven rapid preparation of membrane electrodes
  • A method, device and application of light-driven rapid preparation of membrane electrodes
  • A method, device and application of light-driven rapid preparation of membrane electrodes

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Take a 3.5×3.5cm Nafion115 membrane and soak it in octaethylzinc porphyrin alcohol solution (100 μM) for 5min to wash the excess octaethylzinc porphyrin on the membrane surface. Such as Figure 1~3 As shown, at room temperature, the Nafion membrane loaded with octaethylzinc porphyrin was fixed in two reaction pools 3 (the volume of the reaction pool 3 was 2×2×0.3cm) sealed with a silica gel gasket (sealing gasket 2) , tighten screw 5. Take 2mL K 2 PtCl 4 (20mM) aqueous solution and 2mL ascorbic acid (150mM) aqueous solution in a small bottle, after mixing, add 1.2mL of the reaction solution into the two reaction pools 3 through the feeding channel 4 respectively. The device was placed under a tungsten-halogen lamp (75V, light intensity 570nmol cm -2 the s -1 ) for 5 min, turn off the light source, let Pt grow, and obtain a membrane electrode.

[0043] The molecular structure of octaethyl zinc porphyrin is as follows Figure 5 shown. Figure 6 , 7 For the SEM el...

Embodiment 2

[0044] Example 2: (changing the lighting time)

[0045] Take a 3.5×3.5cm Nafion117 membrane (belonging to cation exchange membrane), soak it in octaethylzinc porphyrin alcohol solution (100μM) for 5min, such as Figure 1~3 As shown, at room temperature, fix the Nafion membrane loaded with octaethylzinc porphyrin between two reaction pools 3 (the volume of the reaction pool 3 is 2×2×0.3 cm) sealed with a silica gel gasket, and tighten the screws 5. Take 2mLK 2 PtCl 4 (20mM) aqueous solution and 2mL ascorbic acid (150mM) aqueous solution in a small bottle, after mixing, add 1.2mL of the reaction solution to the two reaction pools 3 through the feeding channel 4 respectively. The reaction system was placed under a tungsten halogen lamp (75V, the light intensity was 570nmolcm -2 the s -1 ) for 3 minutes, turn off the light source, take it out after 30 minutes, and obtain the membrane electrode.

[0046] The resulting membrane electrode is Figure 8 As shown in , the area of...

Embodiment 3

[0047] Embodiment 3: (change the kind of metal macrocyclic compound)

[0048] Take a 3.5×3.5cm Nafion117 membrane, soak it in 4(N-picoline) zinc porphyrin aqueous solution (100μM) for 5min, wash the excess 4(N-picoline) zinc porphyrin on the surface of the membrane . Such as Figure 1~3 As shown, at room temperature, the Nafion membrane loaded with 4 (N-picoline) zinc porphyrin was fixed in the two reaction pools 3 sealed with silica gel gaskets (the volume of the reaction pool 3 is 2×2×0.3cm) In between, tighten screw 5. Take 2mL K 2 PtCl 4 (20mM) aqueous solution and 2mL ascorbic acid (150mM) aqueous solution in a small bottle, after mixing, add 1.2mL of the reaction solution into the two reaction pools 3 through the feeding channel 4 . Place the device under a tungsten-halogen lamp (75V, light intensity 570nmol cm -2 the s -1 ) for 5 minutes, turn off the light source, let Pt grow, and obtain a membrane electrode.

[0049] The molecular structure of 4 (N-picoline) z...

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Abstract

The invention discloses a method, device and application for rapidly preparing a membrane electrode driven by light. A polymer electrolyte membrane loaded with a metal macrocyclic compound is placed in a reaction device, and a platinum metal precursor and a reducing agent are added to the reaction pool. The mixed solution of platinum nucleates and grows rapidly on the polymer electrolyte membrane under light conditions to obtain a membrane electrode. This method has a simple process, can quickly prepare membrane electrodes, has good repeatability, and is easy to mass-produce membrane electrodes.

Description

technical field [0001] The invention belongs to the field of electrochemistry (membrane electrode preparation technology), and specifically relates to a method, device and application for rapidly preparing a membrane electrode driven by light. Background technique [0002] Membrane electrode system (composed of polymer electrolyte membrane and catalyst layer) is the core and key component of devices such as hydrogen / oxygen proton exchange membrane fuel cells, direct alcohol fuel cells and solid polymer electrolyte water electrolysis cells, and its performance directly affects fuel cells and the performance of the water electrolysis device. Optimizing the preparation method of membrane electrodes is an important method to improve their performance. So far, people have conducted extensive research on the preparation process of membrane electrodes and proposed a variety of methods. According to whether the catalyst has a carrier or not, it can be divided into two modes. The ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M8/1004C25B11/08C23C18/44
CPCC23C18/44C25B11/04H01M8/1004Y02E60/50Y02P70/50
Inventor 宋玉江刘会园
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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