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Catalyst for water electrolysis and preparation and application thereof

A water electrolysis catalyst and catalyst technology, applied in the direction of physical/chemical process catalysts, electrolysis process, electrolysis components, etc., can solve the problems of catalyst conductivity decline, etc., achieve low electrolysis voltage, low specific energy consumption, and increase specific surface area Effect

Inactive Publication Date: 2012-07-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of adding inorganic oxides with high specific surface area is to increase the dispersion of active materials, but it cannot reduce the IrO 2 and RuO 2 particles; and the added inorganic oxides are semiconductors or insulators, resulting in a decrease in the overall conductivity of the catalyst

Method used

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  • Catalyst for water electrolysis and preparation and application thereof
  • Catalyst for water electrolysis and preparation and application thereof
  • Catalyst for water electrolysis and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 0.1617g chloroiridic acid (H 2 IrCl 6 ·6H 2 O), 0.1147g ruthenium chloride (RuCl 3 2H 2 O), 0.0943g molybdic acid (H 2 MoO 4 ·H 2 O) Dissolve in 50ml deionized water, wherein the Ir / Ru molar ratio is 2 / 3. Add 10g sodium nitrate (NaNO 3 ), stirring it to dissolve, then adding 2M NaOH aqueous solution to adjust the pH value to 7. The mixed solution was placed in a water bath at 80° C., stirred and evaporated to dryness, and then dried in an oven at 60° C. for 12 hours. The obtained solid was ground, then placed in a tube furnace, first raised to 350°C at 10°C / min, then raised to 450°C at 5°C / min, and kept at 450°C for 0.5 hours. After the product is cooled to room temperature, add deionized water to dissolve the soluble matter, then centrifuge and wash the insoluble solid, and after repeated several times, place the separated matter in a vacuum oven at 60°C for 24 hours to obtain the catalyst of the present invention Ir 0.4 Ru 0.6 Mo 0.05 o 2.15 , the mass r...

Embodiment 2

[0044] 0.167g chloroiridic acid (H 2 IrCl 6 ·6H 2 O), 0.1185g ruthenium chloride (RuCl 3 2H 2 O), 0.1443g ammonium tungstate ((NH 4 ) 5 h 5 [H 2 (WO 4 ) 6 ]·H 2 O) Dissolve in 50ml deionized water, wherein the Ir / Ru molar ratio is 2 / 3. Add 10g sodium nitrate (NaNO 3), stirring it to dissolve, then adding 2M NaOH aqueous solution to adjust the pH value to 7. The mixed solution was placed in a water bath at 80° C., stirred and evaporated to dryness, and then dried in an oven at 60° C. for 12 hours. The obtained solid was ground, then placed in a tube furnace, first raised to 350°C at 10°C / min, then raised to 450°C at 5°C / min, and kept at 450°C for 0.5 hours. After the product is cooled to room temperature, add deionized water to dissolve the soluble matter, then centrifuge and wash the insoluble solid, and after repeated several times, place the separated matter in a vacuum oven at 60°C for 24 hours to obtain the catalyst of the present invention Ir 0.4 Ru 0.6 W ...

Embodiment 3

[0049] 0.2394g chloroiridic acid (H 2 IrCl 6 ·6H 2 O), 0.1698g ruthenium chloride (RuCl 3 2H 2 O), 0.31g chromium nitrate (Cr(NO 3 ) 3 9H 2 O) Dissolve in 50ml deionized water, wherein the Ir / Ru molar ratio is 2 / 3. Add 10g sodium nitrate (NaNO 3 ), stirring it to dissolve, then adding 2M NaOH aqueous solution to adjust the pH value to 7. The mixed solution was placed in a water bath at 80° C., stirred and evaporated to dryness, and then dried in an oven at 60° C. for 12 hours. The obtained solid was ground, then placed in a tube furnace, first raised to 350°C at 10°C / min, then raised to 450°C at 5°C / min, and kept at 450°C for 0.5 hours. After the product is cooled to room temperature, add deionized water to dissolve the soluble matter, then centrifuge and wash the insoluble solid, and after repeated several times, place the separated matter in a vacuum oven at 60°C for 24 hours to obtain the catalyst of the present invention Ir 0.4 Ru 0.6 Cr 0.12 o 2.36 .

[005...

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Abstract

The invention relates to an anode catalyst used for a water electrolysis device of solid polymer electrolyte. The molecular formula of the catalyst is IrxRu1-xMyOz, wherein x is more than 0 and not more than 1, y is more than 0 and not more than 0.3, z is more than 1.5 and not more than 2.9, and M is one or more of such transition metals as Mo, W and Cr. In terms of the gross weight of the catalyst, the weight ratio of M in the catalyst is less than 10wt%. The required catalyst is characterized in that addition of the third component (or the fourth component) reduces the microcrystal grains of the catalyst, enlarges the specific surface area of the catalyst and improves the catalytic activity of the catalyst. The catalyst has lower overpotential and long life when serving as the anode catalyst in an SPE water electrolysis cell. The catalyst is used for the electrodes for oxygen evolution of the SPE water electrolysis cell, catalyst-membrane assemblies (CCM), membrane-electrode assemblies (MEA), regenerative fuel cells (RFC) and sensors.

Description

technical field [0001] The invention relates to a solid polymer electrolyte (Solid Polymer Electrolyte, SPE) water electrolysis anode catalyst, in particular to a high-efficiency catalyst applicable to SPE water electrolysis, renewable fuel cells or oxygen production electrodes in various electrolysis applications. Background technique [0002] Hydrogen is a clean and efficient energy carrier, which is renewable and non-polluting. Hydrogen production by electrolysis of water is an important means of hydrogen production and a very mature technology for producing high-purity hydrogen. Alkaline water electrolysis technology is often used at present, but there are disadvantages such as easy loss of liquid electrolyte and easy corrosion of equipment. Compared with traditional alkaline water electrolysis, solid electrolyte water electrolysis has obvious advantages, such as higher safety and reliability, higher energy efficiency, and the purity of hydrogen produced by SPE water el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/652B01J23/89H01M4/90C25B11/06
CPCY02E60/50
Inventor 张华民程金斌陈国宝张益宁
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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