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Electrochemical catalyst for oxygen evolution reaction and preparation and application of electrochemical catalyst

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

Inactive Publication Date: 2017-11-03
CAPITAL NORMAL UNIVERSITY
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  • 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

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  • Electrochemical catalyst for oxygen evolution reaction and preparation and application of electrochemical catalyst
  • Electrochemical catalyst for oxygen evolution reaction and preparation and application of electrochemical catalyst
  • Electrochemical catalyst for oxygen evolution reaction and preparation and application of electrochemical catalyst

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 a speed of 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 s...

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...

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Abstract

The invention provides a preparation method of an electrochemical catalyst for oxygen evolution reaction. The preparation method includes: 1) adding cobalt salt and a nonionic surfactant polymer into water, mixing with stirring uniformly, adding a hydrazine hydrate, and incubating under a hydrothermal condition to obtain lamellar cobalt hydroxide, 2) adding the obtained lamellar cobalt hydroxide and thiomolybdate into N,N-dimethyl formamide, mixing by ultrasonic dispersion, and pyrolyzing the thiomolybdate under a solvothermal condition to obtain a non-amorphous-phase molybdenum sulfide layer on the surface of a lamellar base. The invention further provides the electrochemical catalyst for oxygen evolution reaction and application of the electrochemical catalyst. The preparation method has the advantages that the prepared cobalt-molybdenum compound material in an alkaline solution of potassium hydroxide has an excellent effect in catalyzing electrochemical oxygen evolution reaction, electrochemical water splitting efficiency can be improved effectively, and by adopting a hydrothermal method and a solvothermal method to prepare the catalysts, the preparation method is simple and easy to implement and high in 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

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Application Information

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Patent Type & Authority Applications(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
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