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Preparation of membrane electrode for electrolytic tank and application of membrane electrode

A membrane electrode and electrolytic cell technology, applied in the direction of electrodes, electrolytic process, electrolytic components, etc., can solve the problem of incomplete contact between gas diffusion layer electrodes and proton exchange membrane surfaces, and achieve high product preparation efficiency, simple and easy to control methods, Effect of reducing ohmic drop loss

Inactive Publication Date: 2018-04-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gas diffusion layer electrode is not in close contact with the surface of the proton exchange membrane, resulting in a large voltage drop between the two electrodes

Method used

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  • Preparation of membrane electrode for electrolytic tank and application of membrane electrode
  • Preparation of membrane electrode for electrolytic tank and application of membrane electrode
  • Preparation of membrane electrode for electrolytic tank and application of membrane electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of catalyst slurry: first take by weighing 93mg Ir black, 62mg 70wt.% Pt / C, then mix in a certain amount of ethanol according to the mass ratio of catalyst and Nafion according to 4:1, the ratio of catalyst and ethanol The mass ratio is 1:40, and the mixed slurry is ultrasonically mixed for 20 minutes;

[0036] (2) Spraying of catalyst slurry: Spray the ultrasonically uniform catalyst slurry in (1) on both sides of the membrane. The above spraying operations are all carried out on a hot stage, and the temperature of the hot stage is kept constant at 60°C.

[0037](3) Cut the sealing material: the sealing material is divided into two pieces, the inner frame of the sealing material on the cathode side is 3.0 cm long and 2.5 cm wide, the inner frame of the sealing material on the anode side is 2.5 cm long and 2.0 cm wide, and the inner frame of the sealing material is 2.0 cm wide. The difference in size is to avoid tearing the film due to excessive shear st...

Embodiment 2

[0041] During the experiment, it was found that the content of Nafion in the catalytic layer will affect the overall performance of the electrolytic cell. By adjusting the distribution ratio of different components in the MEA preparation process, when the mass ratio of catalyst to Nafion (AS-4) in the catalytic layer is 5 When :1, the performance of the electrolytic cell is improved. Figure 4 It is the full battery steady-state polarization curve under the same test conditions as Example 1. At this time, the electrolytic voltage of the electrolytic cell is reduced to 1.797V@1000mA / cm 2 .

Embodiment 3

[0043] A gas diffusion layer electrode was prepared on the basis of carbon paper. In this electrode, the mass ratio of catalyst to Nafion was 5:1, and other battery parameters were the same as in Example 1. Figure 5 It is the steady-state polarization curve of the full battery under the same test conditions as Example 1, and the performance of the electrolytic cell is obviously reduced. At this time, the electrolytic voltage of the electrolytic cell is reduced to 1.832V@1000mA / cm 2 .

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Abstract

The invention relates to an optimized preparation method of a membrane electrode for electrolysis. A membrane electrode assembly comprises a specific combination of a catalyst layer, a cathode gas diffusion layer, an anode gas diffusion layer and a proton exchange membrane. When the membrane electrode assembly prepared through the preparation method is used as the electrolytic tank of the proton exchange membrane (PEM), the good performance is achieved. The preparation method has the wide using value in regenerative fuel cells (RFC), photoelectrocatalysis and electrolytic hydrogen generator units.

Description

technical field [0001] The invention relates to an optimized preparation method of an electrolytic cell. The membrane electrode assembly comprises a specific combination of a proton exchange membrane cathode / anode catalyst layer and a cathode / anode gas diffusion layer. It can be applied to PEM water electrolysis, RFC or various electrolysis devices. Background technique [0002] In recent years, solid polymer electrolyte (PEM) water electrolysis technology has become a research hotspot in the field of hydrogen production due to its advantages of high efficiency, zero emissions, compact structure, environmental friendliness, and high product purity, and its high-purity oxygen product has also been used In aerospace, medical, analysis and other fields. Membrane electrode is the core component of PEM water electrolysis cell, and the structural optimization to improve the electrolysis efficiency is the focus of researchers from all over the world. [0003] Analyze the electrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/02C25B11/06C25B1/04
CPCC25B1/04C25B11/02C25B11/051Y02E60/36
Inventor 俞红梅迟军贾佳高学强覃博文邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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