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Electrocatalytic hydrogen-production material and preparation method thereof

An electrocatalysis, molybdenum disulfide technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of slow electron transfer rate, small load, poor electrode stability, etc., to achieve improved hydrogen production activity, good application prospects, The effect of good electrocatalytic hydrogen production activity and stability

Active Publication Date: 2017-01-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there are still many problems in the field of electrocatalytic hydrogen separation of non-noble metal-based single-atom catalysts. One is that the loading of single-atom-based catalysts is usually too small due to the need to control the generation of no metal bonds in the entire system. The second is that transition metal chalcogenides are semiconductors, and the electron transfer rate is slow, so it is very important for the electrocatalyst to use a substrate with good conductivity to support the catalyst; the third is the cycle stability of the prepared electrode , the stability of the currently prepared electrocatalyst-loaded electrodes is often poor

Method used

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  • Electrocatalytic hydrogen-production material and preparation method thereof
  • Electrocatalytic hydrogen-production material and preparation method thereof
  • Electrocatalytic hydrogen-production material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Example 1: This example prepares a high-abundance single-atom cobalt-modified molybdenum sulfide composite material, which specifically includes the following steps:

[0016] (1) 1.236g of ammonium heptamolybdate tetrahydrate and 2.284g of thiourea were dissolved in 25mL of deionized water (the molybdenum-sulfur ratio of the precursor was 7:30), and transferred to a polytetrafluoroethylene liner with a volume of 40mL, After sealing, it was placed in a stainless steel autoclave and reacted at 220° C. for 18 hours, and cooled naturally to room temperature. The product was washed three times with absolute ethanol and water, and dried in vacuum at 60°C to obtain molybdenum sulfide sheets, such as figure 1 a-1b, from figure 1 It can be seen from a-1b that when the cobalt nanosheets are not loaded, the surface of the molybdenum disulfide nanosheets presents an obvious regular 2H structure;

[0017] (2) Dissolve 0.54g dicobalt octacarbonyl in 3mL anhydrous o-dichlorobenzene ...

Embodiment 2

[0021] Example 2, this implementation prepares the molybdenum disulfide layered structure modified by cobalt nanosheets according to the steps 1-3 in Example 1, and then the prepared cobalt nanosheets modified molybdenum disulfide layered structure is subjected to the following treatment :

[0022] Drop the ethanol solution of the molybdenum disulfide layered structure modified by cobalt nanosheets onto the surface of the glassy carbon electrode, use the treated glassy carbon electrode as the cathode, use the platinum sheet as the anode, and use 0.5mol / L sulfuric acid solution as the electrolyte , electrochemical scanning was carried out under the constant overpotential shown in Table 1 for 1 hour, and then the glassy carbon electrode was subjected to ultrasound, and the product obtained by ultrasound was dissolved in 1 mL ethanol solution to obtain the iso New electrocatalytic hydrogen production materials A-D with solid structure.

[0023] Table 1

[0024] Consta...

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Abstract

The invention discloses a high-abundance monatomic cobalt-array electrocatalytic hydrogen-production nano material based on the monatomic size effect. According to high-abundance monatomic cobalt-array electrocatalytic hydrogen-production nano material, on the basis that a hydrothermal method is used for preparing laminar molybdenum disulfide and a solvothermal method is used for preparing cobalt nanosheets, the cobalt nanosheets are modified to the surface of the molybdenum disulfide material through an ultrasonic bonding method; and then through the method that electrochemical scanning is conducted on an obtained heterostructure of the cobalt nanosheets and the molybdenum disulfide under an acid condition, redundant cobalt atoms on the surface are removed, and finally, the high-abundance monatomic cobalt-modified molybdenum disulfide lamellar nano material is obtained. The novel electrocatalytic material has good electrochemical hydrogen-production catalytic performance.

Description

technical field [0001] The invention relates to an electrocatalytic hydrolysis hydrogen production catalytic material, in particular to an electrocatalytic hydrolysis hydrogen production material with molybdenum sulfide as a carrier and a single-atom cobalt composite heterostructure and a preparation method thereof. Background technique [0002] Hydrogen production by electrolysis of water is a convenient, efficient and promising hydrogen production method. The hydrogen production reaction of electrolyzed water occurs on the electrode surface, including two basic half-reactions, the cathodic hydrogen evolution reaction and the anode oxygen evolution reaction. For the electrolytic water hydrogen production reaction, how to effectively improve the catalytic activity of the catalytic material, reduce the open overpotential and Tafel slope of the hydrogen evolution reaction, and improve the long-term stability and cycle stability of the electrode material is a hot spot in the fi...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B1/04
CPCC25B1/04C25B11/069Y02E60/36
Inventor 崔小强祁琨刘畅金朝刘璐璐
Owner JILIN UNIV
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