Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A Low Noble Metal Loading Oxygen Evolution Catalyst for Water Electrolyzer

A water electrolyzer and precious metal technology, applied in the field of water electrolysis, can solve the problems of not being able to greatly reduce the precious metal content of the catalyst, low precious metal loading, poor electronic conductivity, etc., and achieve improved binding force and electron transfer rate, low heat treatment temperature, low cost effect

Active Publication Date: 2021-08-06
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, transition metal oxides are often used as carriers, but such oxides are semiconductors or insulators and thus have poor electronic conductivity. In order to enhance the activity of the catalyst, the loading of iridium oxide must be greatly improved to pass the high loading (mass Fraction greater than 60%) iridium oxide to make up for the shortcomings of the lack of electronic conductivity of the carrier material, so this type of technology can not greatly reduce the content of noble metals in the catalyst, the cost of the catalyst and the prepared membrane electrode is still high, urgently need to develop lower Catalysts loaded with precious metals to solve the problems in the prior art

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Low Noble Metal Loading Oxygen Evolution Catalyst for Water Electrolyzer
  • A Low Noble Metal Loading Oxygen Evolution Catalyst for Water Electrolyzer
  • A Low Noble Metal Loading Oxygen Evolution Catalyst for Water Electrolyzer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method for an iridium-titanium composite catalyst, comprising the steps of:

[0031] (1) Get 360mg of chloroiridic acid (mass fraction of iridium in chloroiridic acid is 35%) and add 120mL of pure water, ultrasonic 10min is prepared as the chloroiridic acid solution that iridium concentration is 1mg / mL, adding concentration is 0.1mol / L Sodium hydroxide solution, adjust the pH to about 6, then add 1.08g of powdered titanium with a particle size of 20-200nm, ultrasonically disperse for 10min, and then stir at 25°C for 1h to obtain a mixed solution;

[0032] (2) Nitrogen gas is passed through the mixed solution obtained in step (1) to remove dissolved oxygen, then it is placed in an ice-water bath, and a sodium hydroxide solution with a concentration of 1mol / L is added under stirring conditions, wherein sodium hydroxide and chlorine The molar ratio of iridic acid is 36, and after the dropwise addition is completed, the stirring is continued for 2h under nitro...

Embodiment 2

[0036] A preparation method for an iridium-titanium composite catalyst, comprising the steps of:

[0037](1) Get 36mg of chloroiridic acid and add 120mL of pure water, ultrasonically prepare chloroiridic acid solution with iridium concentration of 0.1mg / mL for 5min, add sodium hydroxide solution with molar concentration of 0.1mol / L, adjust pH to about 6, then Add 0.23g of titanium powder with a particle size of 20-200nm, sonicate for 10min, then stir at 80°C for 2h to obtain a mixed solution;

[0038] (2) Nitrogen gas is passed into the mixed solution obtained in step (1) to remove dissolved oxygen, then it is placed in an ice-water bath, and a sodium hydroxide solution with a molar concentration of 1mol / L is added under stirring conditions, wherein the sodium hydroxide The molar ratio to chloroiridic acid is 1, and after the dropwise addition is completed, the stirring is continued for 0.5h under nitrogen to obtain a precursor solution;

[0039] (3) Place the precursor solut...

Embodiment 3

[0041] A preparation method for an iridium-titanium composite catalyst, comprising the steps of:

[0042] (1) Take 360 ​​mg of chloroiridic acid and add 6 mL of pure water, ultrasonicate for 30 minutes to prepare a chloroiridic acid solution with an iridium concentration of 20 mg / mL, add a sodium hydroxide solution with a concentration of 0.01 mol / L, adjust the pH to about 6, and then add 280mg of titanium powder with a particle size of 20-200nm, ultrasonication for 10min, followed by stirring at 50°C for 0.5h to obtain a mixed solution;

[0043] (2) Nitrogen gas is passed through the mixed solution obtained in step (1) to remove dissolved oxygen, then it is placed in an ice-water bath, and a sodium hydroxide solution with a concentration of 1mol / L is added under stirring conditions, wherein sodium hydroxide and chlorine The molar ratio of iridic acid is 50, and after the dropwise addition is completed, the stirring is continued for 1h under nitrogen condition to obtain a prec...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses an oxygen evolution catalyst with low noble metal loading for water electrolyzers. A kind of oxygen evolution catalyst with low noble metal loading for water electrolyzer, the catalyst is an iridium-titanium composite catalyst, which is composed of powder titanium and iridium oxide loaded on the surface of the powder titanium, and the iridium oxide The mass fraction of the material is 5% to 30%. On the one hand, the catalyst proposed by the present invention adopts metal titanium powder with metal conductivity as the carrier of the catalyst to strengthen the electronic conductivity of the catalyst; As well as the electron transfer rate between the active center and the carrier, the catalyst activity is more than 3 times that of commercial iridium oxide, and the amount of precious metal iridium can be greatly reduced, and the mass ratio of iridium can be reduced to 5% to 30%.

Description

technical field [0001] The invention belongs to the field of water electrolysis, in particular to an oxygen evolution catalyst with low noble metal loading used in a water electrolyzer. Background technique [0002] A water electrolyzer is a device that can convert electrical energy into chemical energy, and it is widely used in energy storage of renewable energy power systems and distributed hydrogen production devices. Current water electrolysis systems such as proton exchange membrane water electrolyzers still face the problem of high cost, so further cost reduction is needed to promote the commercialization of this technology. Membrane electrodes are the core components of water electrolyzers, which consist of anode and cathode noble metal catalysts and polymer electrolyte membranes. The catalysts currently used in proton exchange membrane water electrolyzers are all noble metal catalysts, and the amount of noble metals in the membrane electrodes is very high, resulting...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46B01J37/10C25B1/04
CPCB01J23/468B01J37/10C25B1/04C25B11/091Y02E60/36
Inventor 史言闫常峰卢卓信郭常青王志达谭弘毅
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com