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

A kind of electrochemical catalyst for oxygen evolution reaction and its preparation and application

An oxygen evolution reaction and electrochemical technology, applied in the field of electrochemistry, can solve the problems of unsuitability for large-scale production, slow kinetic process, high price, etc., and achieve excellent catalytic electrochemical oxygen evolution reaction effect, improve efficiency, and catalytic performance. stable effect

Inactive Publication Date: 2019-11-05
CAPITAL NORMAL UNIVERSITY
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex four-electron transfer process of the oxygen evolution half reaction, the kinetic process is slower, which has been the main factor limiting the efficiency of the water splitting process.
People have found through research that compounds containing ruthenium and iridium noble metal elements have a good catalytic oxygen evolution reaction effect. However, due to the small reserves of these noble metals on the earth, the price is relatively expensive, and they are not suitable for large-scale production and applied in actual production.

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 kind of electrochemical catalyst for oxygen evolution reaction and its preparation and application
  • A kind of electrochemical catalyst for oxygen evolution reaction and its preparation and application
  • A kind of electrochemical catalyst for oxygen evolution reaction and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Preparation and electrochemical characterization of an electrochemical catalyst for oxygen evolution reaction with a molar ratio of cobalt to molybdenum of 8:1

[0038] 1) Co(NO 3 ) 2 ·6H 2 O 0.291 g (1 mmol) and 50 mg of polyvinylpyrrolidone (average molecular weight 10,000 Daltons) were added to 6 mL of water, and stirred rapidly at room temperature for 15 min to obtain a uniform pink solution. Then 2 mL of hydrazine hydrate was added dropwise, and stirred vigorously at room temperature for 15 min (using a stirrer at 300 rpm), to obtain a pink suspension. The obtained pink suspension was transferred to a polytetrafluoroethylene-lined autoclave, heated at 160° C. for 24 h, and then naturally cooled to room temperature to obtain a pink solid. After washing 3 times with water and 2 times with ethanol, and centrifuging at 6000rpm for 15 minutes at a high speed, the solid in the lower layer was collected, and then dried in an oven at 60°C. The red solid obtai...

Embodiment 2

[0046] Example 2. Preparation and electrochemical characterization of an electrochemical oxygen evolution catalyst with a molar ratio of cobalt to molybdenum of 4:1

[0047] Same as Example 1, just the Co(NO in step 1) 3 ) 2 ·6H 2 O is replaced by CoCl 2 ·6H 2 O. The stirring 15min in step 1) was changed to stirring 30min. 6000rpm high-speed centrifugation is replaced by stirring 8000rpm high-speed centrifugation.

[0048] Same as Example 1, just change the ammonium thiomolybdate in step 2) into 10.4mg. The heating at 200°C in step 2) was replaced with heating at 180°C. 6000rpm high-speed centrifugation is replaced by stirring 8000rpm high-speed centrifugation.

[0049] By controlling the proportion of raw materials, the black solid is an electrochemical oxygen evolution catalyst with a molar ratio of cobalt and molybdenum elements of 4:1.

[0050] Depend on figure 1 In a and d, it can be seen that the electrochemical oxygen evolution catalyst with a molar ratio of c...

Embodiment 3

[0053] Example 3. Preparation and electrochemical characterization of an electrochemical oxygen evolution catalyst with a molar ratio of cobalt to molybdenum of 16:1

[0054] Same as Example 1, just the Co(NO in step 1) 3 ) 2 ·6H 2 O to CoSO 4 ·7H 2 O. Stirring for 15 minutes was replaced by stirring for 10 minutes. 6000rpm high-speed centrifugation is replaced by stirring 5000rpm high-speed centrifugation.

[0055] Same as Example 1, just change the ammonium thiomolybdate in step 2) into 2.6mg. The heating at 200°C in step 2) was replaced with heating at 210°C. 6000rpm high-speed centrifugation is replaced by stirring 5000rpm high-speed centrifugation.

[0056] The obtained black solid is the electrochemical oxygen evolution catalyst with a molar ratio of cobalt to molybdenum of 16:1.

[0057] Depend on figure 1 In (c) and (f), it can be seen that the electrochemical oxygen evolution catalyst with a molar ratio of cobalt to molybdenum of 16:1 has a lamellar structur...

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
molecular weightaaaaaaaaaa
molecular weightaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for preparing an electrochemical catalyst for oxygen evolution reaction, which includes the following steps: 1) Add cobalt salt and nonionic surfactant polymer to water, stir and mix, then add hydrazine hydrate, and incubate under hydrothermal conditions Obtain lamellar cobalt hydroxide, 2) add the obtained lamellar cobalt hydroxide and thiomolybdate into N,N-dimethylformamide, disperse and mix with ultrasonic, and then pyrolyze thiomolybdate under solvothermal conditions. Molybdate produces an amorphous molybdenum sulfide layer on the surface of the lamellar substrate. The invention also proposes the prepared catalyst and its application. The cobalt-molybdenum composite material prepared by the method of the present invention has excellent catalytic electrochemical oxygen evolution reaction effect in an alkaline solution of potassium hydroxide, and can effectively improve the efficiency of electrochemical water splitting. The invention adopts hydrothermal method and solvothermal method to prepare the catalyst, which is simple and easy to implement and has good controllability.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a catalyst for oxygen evolution reaction, its preparation method and application. Background technique [0002] Energy is the main issue affecting the development of today's society. Although traditional fossil energy (mainly coal, oil and natural gas) still occupies a dominant position, due to the short-term non-renewable, rapid consumption, and the greenhouse effect caused by use, the release Toxic gas, environmental degradation and other issues are destined to fail to provide sufficient impetus for the advancement of society in the future. The development of clean and renewable new energy such as wind energy, solar energy, and hydrogen energy is in line with the laws and needs of social progress. However, due to the instability and intermittency of wind energy and solar energy, there are certain security issues in the direct use of new energy. Facing this challeng...

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): B01J27/051C25B11/06C25B1/04
CPCC25B1/04B01J27/0515C25B11/091B01J35/33Y02E60/36
Inventor 林雨青孙凤展丁永奇李长青
Owner CAPITAL NORMAL UNIVERSITY
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