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A membrane electrode with double metal layer anode for electrolysis of water and preparation method thereof

A bimetallic layer and membrane electrode technology, applied in the field of electrochemistry, can solve problems such as low electrolysis efficiency, insufficient binding force, and reduced stability of electrolyzed water devices, and achieve advanced preparation technology, solve weak bonding, and excellent stability Effect

Active Publication Date: 2018-06-22
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The existing problems include: high cost due to the use of precious metals (low cost performance), electrolysis efficiency (energy conversion efficiency) still cannot meet the requirements of new energy technology for high energy conversion efficiency, catalyst layer and solid polymer membrane ( The binding force between the proton exchange membrane) is not strong enough to reduce the stability of the electrolytic water device, etc.
[0009] Obviously, although people have done a lot of work on improving the electrolysis efficiency and stability of membrane electrodes, such problems have not been well resolved.
In view of these problems, the present invention designs and proposes a novel anode structure and electrode manufacturing process, which better solves the problems of high overpotential, low electrolysis efficiency, and poor binding force between the catalytic layer and the proton exchange membrane that exist in the current electrode.

Method used

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  • A membrane electrode with double metal layer anode for electrolysis of water and preparation method thereof
  • A membrane electrode with double metal layer anode for electrolysis of water and preparation method thereof
  • A membrane electrode with double metal layer anode for electrolysis of water and preparation method thereof

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preparation example Construction

[0039] A membrane electrode with a double metal layer anode and a preparation method thereof comprise the following steps:

[0040] 1) Soak the solid polymer membrane (Nafion proton exchange membrane) with pure water, take it out and blot the surface water, cut out the required size with a die cutter, and use the hollow special tooling fixture of the present invention (see attached figure 1 ) are clamped to form a cavity on both sides of the solid polymer film for the exchange deposition of the catalytic layer;

[0041] 2) Take a certain concentration of Pt(NH 3 ) 4 Cl 2 Or other solutions containing platinum ions, added to the cavity on the side intended to be the anode, to exchange the platinum ions with the hydrogen ions on the surface of the solid polymer membrane. The exchange time is 1-3 hours. In order to ensure the exchange effect, the solution can also be replaced Perform 2 to 3 exchanges; to ensure that a sufficient amount of platinum ions are exchanged to the sur...

Embodiment 1

[0047] Nafion115 membrane (DuPont, USA, thickness 127 microns)) soaked in pure water for 3 hours, took out and blotted the surface water, then cut out a 60cm×60cm square piece, carefully placed the cut solid polymer membrane in a special tooling mold, such as figure 1 The cavity area of ​​the mold shown is 50×50cm, which is composed of two symmetrical splints up and down and fastened with screws. Add 25g / L of Pt(NH 3 ) 4 Cl 2 Solution 25ml, standing exchange 3h at room temperature, then reclaim Pt(NH 3 ) 4 Cl 2 Solution, replaced with a new solution for another 3 hours to ensure sufficient exchange of hydrogen protons and platinum ions on the surface of the solid polymer membrane. After the exchange is complete, remove the platinum-containing solution and add 0.01mol / L NaBH 4 Solution 20ml, reduction reaction at room temperature for 30 minutes, the platinum particles exchanged to the surface of the solid polymer film are reduced to form a uniform and dense bright platin...

Embodiment 2

[0056] Except that the preparation of the iridium catalyst layer is different from Example 1, other steps are the same as Example 1.

[0057] The iridium catalyst layer is prepared by electrodeposition.

[0058] The formula of electrodeposition solution is: ammonium chloroiridate 10g / L, boric acid 40g / L, sodium malonate 2g / L;

[0059] The platinum catalyst layer deposited on the proton exchange membrane is used as the cathode, and the platinum sheet is used as the anode, at 85°C, the deposition current density is 2mA / cm 2 Deposition for 6 hours; the amount of iridium deposition is 0.3mg / cm 2 .

[0060] Electrolyzed water test at 70°C with a current density of 500mA / cm 2 , the cell voltage is 1.60V.

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Abstract

The invention relates to a membrane electrode with a bimetallic layer positive electrode for electrolysis water and a preparation method of the membrane electrode. The membrane electrode is formed by combining a cathode catalyst layer, an anode catalyst layer and a proton exchange membrane, wherein the cathode catalyst layer comprises thin-layer platinum, the anode catalyst layer comprises a bimetallic layer composed of a platinum metal thin layer and a iridium metal thin layer, the proton exchange membrane is a Nafion115 membrane, the cathode catalyst layer and the anode catalyst layer are formed by sequentially reducing and depositing metal ions on the proton exchange membrane by an ion exchange-reduction deposition method, the cathode catalyst layer is a pure platinum metal layer, and the anode catalyst layer is a Pt / Ir bimetallic layer. The membrane electrode prepared according to the technology of the invention has the advantages that the catalyst layers and a solid electrolyte are tightly and firmly combined, the activity of electrolysis water is high and the electrode stability is high. The overpotential of the electrolysis water of the bimetallic layer positive electrode prepared according to the invention is remarkably lower than those of a monometallic layer positive electrode and a platinum-iridium alloy positive electrode.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a membrane electrode with a double metal layer anode for electrolyzing water and a preparation method thereof. Background technique [0002] Hydrogen has the advantages of rich resources, high calorific value, clean and pollution-free, and can be stored and transported. It is the most potential energy carrier. Hydrogen is also an important industrial raw material and special gas with a wide range of uses. Electrolyzed water hydrogen production technology is an important technical means to obtain hydrogen, and the global annual market for electrolyzed water equipment is about 3 billion US dollars. With the development of fuel cell technology and fuel cell vehicles, and the development of renewable energy such as solar energy, wind energy, etc. into hydrogen technology, electrolysis of water technology has become an increasingly important technology. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/86H01M4/88Y02E60/50
Inventor 廖世军邹浩斌张和
Owner SOUTH CHINA UNIV OF TECH
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