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Active cathode and its production

An active cathode, cathode technology, applied in the direction of electrode, electrode shape/type, electrolysis process, etc., can solve the problems of complex manufacturing process and unstable performance

Active Publication Date: 2007-09-05
BLUESTAR BEIJING CHEM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Active cathodes are mostly used in current technologies, but their manufacturing processes are complicated and their performance is unstable

Method used

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  • Active cathode and its production
  • Active cathode and its production

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Use a degreasing agent to remove the oil stain on the surface of the woven nickel mesh (substrate) and sandblasting to roughen the surface, and its roughness can be directly observed under a microscope. Then carry out annealing treatment with annealing temperature of 500°C for 2 hours. After annealing, keep the temperature at 70°C in 220 g / L sulfuric acid solution for 5 minutes. Take out the metal mesh and rinse with water to remove residual acid. The samples were then activated with metal oxides obtained by thermally decomposing coatings of the following composition in a furnace:

[0057] Nickel Chloride 50 g / L

[0058] Ruthenium trichloride 200 g / L

[0059] Hydrochloric acid 50 g / L

[0060] Lanthanum Chloride 25 g / L

[0061] After drying at 20°C for 30 minutes, the samples were heated in an oven at 500°C to 600°C for 10 minutes, burned, and then cooled to room temperature.

[0062] The above steps are repeated 5-20 times to obtain a surface covering layer with an ...

Embodiment 2

[0069] Use a degreasing agent to remove the oil stain on the surface of the expanded nickel mesh (substrate) and sandblasting to make the surface rough, and its roughness can be directly observed under a microscope. Then perform annealing treatment, the annealing temperature is 400°C, the time is 2 hours, after annealing, heat it to 80°C in 300 g / L sulfuric acid solution and place it for 20 minutes, take out the metal mesh, rinse it with clean water, and remove the residual acid solution. The samples were then activated with metal oxides obtained by thermally decomposing coatings of the following composition in a furnace:

[0070] Nickel Chloride 25 g / L

[0071] Cerium Chloride 25 g / L

[0072] Ruthenium trichloride 250 g / L

[0073] Hydrochloric acid 70 g / L

[0074] Oxalic acid 50 g / L

[0075] After drying at 40°C for 10 minutes, the samples were heated in an oven at 500°C to 600°C for 15 minutes and then cooled to room temperature.

[0076] The above steps are repeated 5-...

Embodiment 3

[0084] Use a degreasing agent to remove the oil stain on the surface of the drilled stainless steel mesh (substrate) and sandblasting to roughen the surface, and its roughness can be directly observed under a microscope. Then perform annealing treatment, the annealing temperature is 650°C, the time is 1.5 hours, after annealing, heat to 80°C in 200 g / L hydrochloric acid solution and let it stand for 30 minutes, take out the metal mesh, rinse it with clean water, and remove the residual acid solution. The samples were then activated with metal oxides obtained by thermally decomposing coatings of the following composition in a furnace:

[0085] Nickel Chloride 25 g / L

[0086] Cerium Chloride 25 g / L

[0087] Ruthenium trichloride 200 g / L

[0088] Hydrochloric acid 100 g / L

[0089] After drying at 40°C for 20 minutes, the samples were heated in an oven at 400°C to 500°C for 30 minutes and then cooled to room temperature.

[0090] The above steps are repeated 5-20 times to obta...

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Abstract

An active cathode and its production are disclosed. It adopts geometric metal mesh as matrix, 10mum-30mum coating is coated on matrix surface. The coating materials consist of one or several metal salt from VIII-family metal cobalt, nickel, zinc, ruthenium, cadmium, iridium and platinum and one or several metal salt from lanthanide metal lanthanum, cerium and praseodymium and inorganic acid or organic acid substances. The process is carried out by pre-treating, preparing solution for active coating, thermal ionizing and after-treating. It can be used for chloro-base industrial ionic film electrolytic cell.

Description

technical field [0001] The invention relates to an electrode covered with an active coating on the surface of a metal substrate, and a method for preparing the cathode, which is mainly used in ion membrane electrolyzers in the chlor-alkali industry. Background technique [0002] Technological progress in the field of alkali metal halide electrolysis has led to a continuous reduction in energy consumption per unit of product. This is the result of significant improvements in electrolyzer geometry design and the replacement of porous membranes with ion-exchange membranes with increasingly electrocatalytically enhanced cathodes to reduce the hydrogen overvoltage, but the cost of ion-exchange membranes is higher. Active cathodes are mostly used in current technologies, but their manufacturing processes are complex and their performance is unstable. An often-studied technique is to obtain an active cathode by applying an active coating to a supporting metal substrate of a geomet...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B11/03C25B1/46
Inventor 邢家悟康建忠王玉兰张良虎陆崖青刘怡于昕王锐
Owner BLUESTAR BEIJING CHEM MACHINERY
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