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Electrode for electrolytic processes and method of manufacturing thereof

An electrode and process technology, applied in the electrode field of electrolysis process, can solve problems such as high cathode overvoltage

Active Publication Date: 2014-04-02
IND DE NORA SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electrodes of this type exhibit sufficient catalytic activity only if the noble metal phase contains high amounts of platinum, preferably with significant additions of rhodium; for example, replacing platinum with cheaper ruthenium in the catalytic phase necessarily Sudden onset of significantly higher cathode overvoltage

Method used

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  • Electrode for electrolytic processes and method of manufacturing thereof
  • Electrode for electrolytic processes and method of manufacturing thereof

Examples

Experimental program
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Effect test

example 1

[0016] Put the amount corresponding to 100g Ru of Ru(NO)(NO 3 ) 3 Dissolve in 300 ml of glacial acetic acid to which a few ml of concentrated nitric acid have been added. The solution was stirred for three hours, keeping its temperature at 50°C. This solution was then poured into 500 ml volume of 10% by weight acetic acid (ruthenium solution).

[0017] Separately, the amount of Pr(NO 3 ) 2 Dissolve in 300 ml of glacial acetic acid to which a few ml of concentrated nitric acid have been added. The solution was stirred for three hours, keeping its temperature at 50°C. This solution was then poured into 500 ml volume of 10% by weight acetic acid (rare earth element solution).

[0018] 480 ml of the ruthenium solution were mixed into 120 ml of the rare earth element solution and stirred for five minutes. The solution thus obtained was poured into 1 liter of 10% by weight acetic acid (precursor).

[0019] A nickel mesh 200 of size 100mm x 100mm x 0.89mm was subjected to the...

example 2

[0023] Put the amount corresponding to 100g Ru of Ru(NO)(NO 3 ) 3 Dissolve in 300 ml of glacial acetic acid to which a few ml of concentrated nitric acid have been added. The solution was stirred for three hours, keeping its temperature at 50°C. This solution was then poured into 1 liter volume of 10% by weight acetic acid (precursor).

[0024] A nickel mesh 200 of size 100mm x 100mm x 0.89mm was subjected to the following process: blasting with corundum, etching in 20% HCl at 85°C for 2 minutes and thermal annealing at 500°C for 1 hour. The previously obtained precursor was then applied by brushing in 7 successive coats, followed by a drying treatment at 80°C-90°C for 10 minutes and thermal decomposition at 500°C for 10 minutes after each coat, until 12g / m 2 Deposition of Ru.

[0025] The sample was subjected to a performance test showing that at 3kA / m 2Under hydrogen evolution in 33% NaOH at a temperature of 90 °C, the ohmic drop-corrected initial cathodic potential of...

example 3

[0028] Pt(NH 3 ) 2 (NO 3 ) 2 Dissolve in 200ml glacial acetic acid. The solution was stirred for 3 hours, keeping its temperature at 50°C, and then poured into a volume of 500 ml of 10% by weight acetic acid (platinum solution).

[0029] Put the amount corresponding to 100g Ru of Ru(NO)(NO 3 ) 3 Dissolve in 300 ml of glacial acetic acid to which a few ml of concentrated nitric acid have been added. The solution was stirred for three hours, keeping its temperature at 50°C. This solution was then poured into 500 ml volume of 10% by weight acetic acid (ruthenium solution).

[0030] Separately, the amount of Pr(NO 3 ) 2 Dissolve in 300 ml of glacial acetic acid to which a few ml of concentrated nitric acid have been added. The solution was stirred for three hours, keeping its temperature at 50°C. This solution was then poured into a volume of 500 ml of 10% by weight acetic acid (rare earth element solution). 480 ml of the ruthenium solution were mixed into 120 ml of th...

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Abstract

The invention relates to an electrode for electrolytic processes, particularly to a cathode suitable for hydrogen evolution in an industrial electrolysis process comprising a metal substrate coated with an external catalytic layer containing crystalline ruthenium oxide having a highly ordered rutile-type structure with Ru Ru and Ru O bond length characterised by a Debye-Waller factor lower than a critical value. The catalytic outer layer may contain rare earth oxides, such as praseodymium. The electrode may also comprise an internal catalytic thin layer platinum-based, which gives an enhanced protection against accidental current reversal events.

Description

technical field [0001] The present invention relates to an electrode for an electrolysis process, in particular to a cathode suitable for hydrogen evolution in an industrial electrolysis process, and to a method for its manufacture. Background of the invention [0002] The invention relates to an electrode used in an electrolysis process, in particular to a cathode suitable for hydrogen evolution in an industrial electrolysis process. The electrolysis of alkaline brines for the simultaneous production of chlorine and alkali and the electrochemical production of hypochlorite and chlorate are the most typical examples of industrial electrolysis applications with cathodic hydrogen evolution, but the electrodes are not limited to any particular application. In the electrolytic process industry, competitiveness is linked to several factors, chief among them the reduction of energy consumption, which is directly linked to the process voltage; this justifies the effort to reduce th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46C25B11/04H01M4/90C23C18/12
CPCC25B11/04C25B11/0484B01J23/462B01J23/892H01M4/9016C23C18/12C23C18/1216B01J37/0225C23C18/1225Y02E60/50C25B11/093
Inventor M·布里奇斯A·L·安托兹A·卡尔德拉拉
Owner IND DE NORA SPA
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