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High-activity cathode and preparation method thereof

A high-activity, cathode technology, applied in the direction of electrodes, electrode shapes/types, electrolytic components, etc., can solve the problems of easy generation of pores and unfavorable combination of coating layer and Ni matrix, so as to avoid pores and resist reverse current Enhanced impact and anti-poisoning ability, improved bonding effect

Inactive Publication Date: 2012-02-15
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating layer has two components with different functions: one component contains Pd or Pd-Ag metal elements and their oxides, which protect against current reverse; one component contains at least one metal, platinum and ruthenium, and their oxides Or at least platinum, ruthenium and a small amount of rhodium and its oxides have a good catalytic effect, but a small amount of rhodium is added as a catalyst to the coating layer, and the production process is direct thermal decomposition, which is easy to generate pores, which is not conducive to the coating layer. Good combination with Ni matrix

Method used

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  • High-activity cathode and preparation method thereof
  • High-activity cathode and preparation method thereof
  • High-activity cathode and preparation method thereof

Examples

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Effect test

Embodiment 1

[0040] The nickel mesh was sandblasted in turn, and the nickel mesh was etched in a water bath at 50°C for 1 hour with a sulfuric acid solution with a mass fraction of 20%, cleaned by ultrasonic vibration in double-distilled water for 5 minutes, and dried in the air for later use. Apply the coating solution to the pre-treated Ni mesh substrate with a wool brush, and thermally decompose it to obtain a transition layer and an active layer.

[0041] The transition layer coating solution consists of:

[0042] Rhodium nitrate 1.5g / L

[0043] Concentrated nitric acid (mass fraction is about 65%) 2ml / L

[0044] Active layer coating solution consists of:

[0045]

[0046] Apply the coating solution of the transition layer to the Ni grid, dry at 160°C for 15 minutes, then put it into a high-temperature furnace, bake it at 500°C for 10 minutes, and cool to room temperature; repeat the above steps to make the Rh loading on the surface of the active cathode 0.1 g / m 2 .

[0047] Co...

Embodiment 2

[0051] The nickel mesh was sandblasted in turn, etched with 15% sulfuric acid solution in a water bath at 60°C for 1.5 hours, ultrasonically oscillated in twice distilled water for 5 minutes to clean it, and dried in the air for later use. Apply the coating solution to the pre-treated Ni mesh substrate with a wool brush, and thermally decompose it to obtain a transition layer and an active layer.

[0052] The transition layer coating solution consists of:

[0053] Rhodium nitrate 2g / L

[0054] Concentrated nitric acid 2ml / L

[0055] Active layer coating solution consists of:

[0056]

[0057] Apply the coating solution of the transition layer to the Ni grid, dry at 150°C for 15 minutes, then put it into a high-temperature furnace, bake at 450°C for 15 minutes, and cool to room temperature; repeat the above steps to make the Rh loading on the surface of the active cathode 0.15 g / m 2 .

[0058] Coat the active layer coating solution on the Rh-coated Ni mesh substrate aft...

Embodiment 3

[0062] The nickel mesh was sandblasted in turn, etched with 25% sulfuric acid solution in a water bath at 80°C for 0.5 hours, cleaned by ultrasonic vibration in double-distilled water for 5 minutes, and dried in the air for later use. Apply the coating solution to the pre-treated Ni mesh substrate with a wool brush, and thermally decompose it to obtain a transition layer and an active layer.

[0063] The transition layer coating solution consists of:

[0064] Rhodium nitrate 2g / L

[0065] Concentrated nitric acid 2ml / L

[0066] Active layer coating solution consists of:

[0067]

[0068]

[0069] Apply the coating liquid of the transition layer to the Ni grid, dry it at 180°C for 10 minutes, then put it into a high-temperature furnace, bake it at 500°C for 10 minutes, and cool it to room temperature; repeat the above steps to make the Rh loading on the surface of the active cathode be 0.12g / m 2 .

[0070] Coat the active layer coating solution on the Rh-coated Ni me...

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Abstract

The invention relates to a high-activity cathode and a preparation method thereof. The method comprises the steps of: providing a Ni net used as a cathode base body; preparing transition layer coating liquid, wherein the content of Rh(NO3)3 is 1g / L to 3g / L; coating the transition layer coating liquid on the Ni net and carrying out drying and thermal decomposition treatment to obtain a transition layer on the Ni net; preparing active layer coating liquid, wherein the contents of H2PtCl6 6H2O, RuCl3 3H2O and Ce(NO3)3 6H2O are respectively 3 to 6 g / L, 15 to 25 g / L and 1 to 2 g / L; and coating the active layer coating liquid on the Ni net with the transition layer and carrying out drying and thermal decomposition treatment to obtain an active layer on the transition layer. The composition of the high-activity cathode prepared by the method is Ni / Rh2O3 / RuO2-Pt-CeO2, the transition layer and the active layer of the base body surface are realized through separated coating, the loading quantity of the rhodium element in the coating layer is only 0.08 to 0.2 g / m<2>, the coating layer manufacture processes comprise pre-drying and thermal decomposition, the air hole generation is avoided, the bonding force of the transition layer with the Ni base body is greatly enhanced, the integral stability of the electrode is good, and the reverse current impact resistance capability and the poisoning resistance capability are greatly enhanced.

Description

technical field [0001] The invention relates to a preparation method of a highly active cathode which is particularly suitable for the chlor-alkali industrial ion membrane electrolyzer. Background technique [0002] As the basic industry in the modern chemical industry, the chlor-alkali industry occupies a very important position in the national economy. Since the 1960s, the development and utilization of dimensionally stable anode (DSA) and ionic membrane technologies have greatly reduced the overpotential of chlorine evolution at the anode, thus making the phenomenon of excessively high cathode overpotential more prominent. Therefore, it is particularly important to develop cathode materials with high activity and high stability. [0003] Ruthenium and platinum are widely used in cathode coatings because of their good hydrogen evolution properties. JP-B-55-22556 applies a solution containing platinum metal oxide to a heated metal substrate, and then bakes the coated mate...

Claims

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Application Information

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IPC IPC(8): C25B11/02C25B11/04C25B11/08C25B1/34
Inventor 黎学明黄舒李武林陶传义
Owner CHONGQING UNIV
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