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A kind of hydrogen evolution electrocatalyst and its preparation method and application

An electrocatalyst and atomic technology, applied in the direction of electrodes, electrolytic components, electrolytic processes, etc., can solve the problems of poor activity and stability of non-platinum catalysts, complex synthesis of alloy catalysts, and limited improvement of activity, etc., to achieve fewer steps, The effect of mild conditions and excellent hydrogen evolution activity

Active Publication Date: 2022-06-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the activity and stability of non-platinum catalysts are poor and cannot meet the requirements
The synthesis of alloy catalysts requires complex processes and has limited improvement in activity

Method used

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  • A kind of hydrogen evolution electrocatalyst and its preparation method and application
  • A kind of hydrogen evolution electrocatalyst and its preparation method and application
  • A kind of hydrogen evolution electrocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) 1568mg 2-methylimidazole was dissolved in 200ml methanol to obtain solution A; 1320mg hexahydrate zinc nitrate and 22.5mg nonahydrate cobalt nitrate were dissolved in 200ml methanol to obtain solution B; solutions A and B were mixed ultrasonically After 10 minutes, it was transferred to a hydrothermal kettle, and hydrothermally reacted in a blast oven at 120 °C for 6 hours;

[0033] After the hydrothermal reaction, the precipitate formed and settled on the bottom of the inner tank of the hydrothermal kettle. The supernatant liquid was sucked out with a plastic dropper, and the precipitate containing a little supernatant liquid was poured into a centrifuge tube, and then methanol was added to the centrifuge tube. Centrifuged and washed with methanol for three times, and the obtained precipitate was dried in a blast drying oven at 60 °C for 12 h;

[0034] The dried purple powder was poured into a mortar and fully ground, poured into a porcelain boat, placed in a quart...

Embodiment 2

[0043] The difference between this example and Example 1 is: in step 1, 1320 mg of zinc nitrate hexahydrate and 32 mg of cobalt dichloride are dissolved in 200 ml of methanol to obtain solution B.

Embodiment 3

[0045] The difference between this example and Example 1 is: in step (1), 1320 mg of zinc nitrate hexahydrate and 65 mg of cobalt sulfate are dissolved in 200 ml of methanol to obtain solution B.

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Abstract

The invention discloses a hydrogen evolution electrocatalyst and its preparation method and application. The catalyst includes a composite material doped with Co and Pt double single atoms, and both Co and Pt in the composite material exist in the form of single atoms, wherein, The Co active site contains Co-N coordination, and the Pt active site contains Pt-N / C coordination. The preparation method comprises: preparing a transition metal-doped carbon carrier; making the carbon carrier physically adsorb platinum ions; reducing the platinum by using an electrochemical reduction method, and the platinum and cobalt in the obtained catalyst both exist in the form of single atoms. Both Co and Pt in the catalyst of the present invention exist in the form of single atoms and contain two kinds of active sites; the carbon carrier doped with transition metals has a large specific surface area and many defects have a strong ability to anchor platinum single atoms; the obtained single The atomic catalyst has excellent hydrogen evolution activity, and the preparation method is mild and simple, which can be applied in electrolysis of water.

Description

technical field [0001] The invention relates to an electrocatalyst and a preparation method and application thereof, in particular to a hydrogen evolution electrocatalyst and a preparation method and application thereof. Background technique [0002] Commercial Pt / C is one of the widely used electrocatalysts for hydrogen evolution in water electrolysis. However, the high price of platinum metal leads to high cost of electrolyzed water. Therefore, reducing the Pt loading in the catalyst is an urgent problem to be solved. [0003] The methods for reducing platinum loading mainly include the preparation of non-platinum catalysts, alloy catalysts and single-atom catalysts. However, the activity and stability of non-platinum catalysts are very poor and cannot meet the requirements. The synthesis of alloy catalysts requires complex processes with limited improvement in activity. Therefore, in recent years, efforts have been devoted to the synthesis of single-atom catalysts. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04C25B11/054C25B11/065
CPCC25B11/091C25B11/054C25B11/065C25B1/04Y02E60/36
Inventor 刘建国陈雅文丁睿李佳
Owner NANJING UNIV
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