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Electrode for electrolysis, preparation method of electrode and electrolytic bath

A technology of electrode and conductivity, which is applied in the field of electrolytic cell, electrode for electrolysis and its preparation, can solve the problems such as the drop of chlorine evolution current efficiency, the second layer is easy to fall off, and the electrode oxygen evolution potential is low, so as to achieve good electrocatalytic performance, Good electrolytic stability and high oxygen evolution potential

Active Publication Date: 2015-04-29
BLUESTAR BEIJING CHEM MACHINERY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] An article titled "Metal Anode Coating Evaluation Test" in the second issue of February 2000 in the chlor-alkali industry mentioned that the coating electrode with ruthenium dioxide as the basic component has a high catalytic activity for chlorine evolution, so if the electrode The coating contains ruthenium dioxide, and the chlorine evolution potential of the electrode is very low, but the oxygen evolution potential of the electrode is also low, and the electrode also has oxygen precipitation while analyzing chlorine, so that the current efficiency of chlorine analysis decreases, and the oxygen content in chlorine rise
However, in the electrode for electrolysis of the invention, because the second layer is an alloy of palladium and platinum, when the amount of platinum and palladium added is small, it will be mixed with at least one of the group consisting of ruthenium oxide, iridium oxide and titanium oxide. The adhesion of the first layer of oxide coating is not good, and the second layer is easy to fall off. To achieve the purpose of long-term low chlorine overvoltage and excellent durability, and to obtain a stable alloy, the addition of palladium and platinum should be large , and platinum must reach a certain amount, so the cost of the electrode is still very high

Method used

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  • Electrode for electrolysis, preparation method of electrode and electrolytic bath
  • Electrode for electrolysis, preparation method of electrode and electrolytic bath
  • Electrode for electrolysis, preparation method of electrode and electrolytic bath

Examples

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preparation example Construction

[0054] The preparation method of electrode for electrolysis of the present invention comprises the steps:

[0055] S100: Pretreat the conductive substrate; pretreatment includes decontamination and sandblasting; first remove the surface oil, which can make the conductive substrate and the underlying coating stronger; then conduct the substrate Sand blasting treatment, sand blasting treatment can increase the roughness of the surface of the conductive substrate, increase the contact area between the bottom coating and the conductive substrate, and improve the adhesion of the bottom coating on the conductive substrate;

[0056] S200: Anneal the conductive substrate that has been sandblasted; the operation steps of the annealing treatment are to clamp the conductive substrate with an annealing extrusion frame, keep it warm for 30 to 120 minutes at 450°C to 600°C, and then anneal It reduces the hardness of the surface of the conductive substrate, eliminates the internal residual s...

Embodiment 1

[0062] Electrode preparation for present embodiment electrolysis is as follows:

[0063] Step (1): Conductive base material pretreatment: Conductive base material is drawn into the net (mesh size is: long pitch * short pitch * silk stem width: 6.0 * 3.0 * 1.0 ), first degreasing the conductive substrate, and then putting the titanium mesh into the annealing furnace for annealing and leveling. After annealing, an oxide layer is formed on the surface of the conductive substrate, and then it is etched in a sulfuric acid solution. In this embodiment, the acid concentration is 23-27%, the temperature is 85-95°C, and the etching time is 2-6 hours. After pickling, the titanium mesh is cleaned with water and dried.

[0064] Step (2): Primer coating preparation:

[0065] Contain ruthenium, iridium, titanium three kinds of elements in the primer coating in the present embodiment, and wherein in the primer coating solution, metal salt mol percentage is as follows: Ruthenium: iridium: t...

Embodiment 2

[0071] The preparation of the electrode for electrolysis in this embodiment is as follows:

[0072] Step (1): Conductive substrate pretreatment:

[0073] The base material is a net made of δ=1.2mm TA1 plate (mesh size: long pitch×short pitch×stem width: 8.0×4.0×1.2), degreasing, annealing, leveling, etching and pickling Finally, the titanium mesh is cleaned with water and dried.

[0074] Step (2): Primer coating preparation:

[0075] The molar percentage content of the metal salt in the primer coating solution is as follows: ruthenium: iridium: titanium=41%:20%:39%, and the preparation of the primer coating solution is the same as in Example 1.

[0076] Use a coating machine to evenly coat the prepared bottom layer coating solution on the anode grid. Send the anode mesh that has completed the coating and drying process into a firing furnace for firing in an air atmosphere. The burning temperature is 488°C, and the time is 15-40 minutes. Repeat this 8 times to obtain the b...

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Abstract

The invention provides an electrode for electrolysis, a preparation method of the electrode and an electrolytic bath. The electrode for electrolysis comprises a conductive base material and an active coating, wherein the conductive base material is a base material containing titanium or titanium alloy; the active coating at least comprises a bottom coating layer and a surface coating layer; the bottom coating layer is prepared from titanic oxide, iridium oxide and ruthenium oxide; the surface coating layer is prepared from iridium oxide, ruthenium oxide, titanium oxide and a metal or an oxide of one of two of palladium and platinum. According to the electrode for electrolysis disclosed by the invention, the double coating layers are adopted; compared with the single coating layer only containing ruthenium, iridium and titanium, the electrode is better in activity, the chlorine evolution potential of the electrode is low, the oxygen evolution potential is high, the service life of the electrode is longer, and the electrolysis stability is better.

Description

technical field [0001] The invention relates to the field of electrodes, in particular to an electrode for electrolysis, a preparation method thereof, and an electrolytic cell. Background technique [0002] Ion membrane soda production is to use ion exchange membrane method to electrolyze salt water to make caustic soda (sodium hydroxide). With the development of ion membrane electrolysis, chlor-alkali production consumes a lot of electricity, and reducing energy consumption has always been the core issue of electrolysis. . The cell voltage of the electrolyzer is an important parameter, which directly affects the current efficiency. The cell voltage of ion-exchange membrane electrolyzer can be expressed by the following formula: [0003] [0004] In the formula, V is the cell voltage; Vo is the theoretical decomposition voltage; VM is the voltage drop of the ionic membrane; Positive is the anode overvoltage; Yin is the cathode overvoltage; IR liquid is the ohmic vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/10C25B11/06C25B1/46
Inventor 陆崖青于昕张良虎康建忠王伟红刘怡
Owner BLUESTAR BEIJING CHEM MACHINERY
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