Non-noble metal diatomic electrocatalyst, and preparation method and application thereof

An electrocatalyst and non-precious metal technology, which is applied in the field of non-noble metal diatomic electrocatalyst and its preparation, can solve the problems of increased surface free energy and poor stability, and achieve the effects of high current density, stable performance and small Tafel slope

Active Publication Date: 2019-05-21
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, single-atom catalysts with only one single metal site are less stable d

Method used

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  • Non-noble metal diatomic electrocatalyst, and preparation method and application thereof
  • Non-noble metal diatomic electrocatalyst, and preparation method and application thereof
  • Non-noble metal diatomic electrocatalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1

[0041] When the molar ratio of metal tungsten and molybdenum is 3:17. Accurately pipette 4.736 mL of dispersion A and accurately weigh 0.2368 g (NH 4 ) 6 Mo 7 O 24 •4H 2 O was placed in dispersion B for ultrasonic dispersion for 4 h, the pH of the solution was adjusted to > 6.0, and then the mixture was heated to 190 oC for 12 hours. After the reaction was completed, the hydrothermal kettle was cooled, the product was taken out, the columnar product was frozen in liquid nitrogen, and then dried in a freeze dryer for 30 h to obtain aerogel. Set the oven temperature to 800 o C, the gas flow is Ar: 150 sccm, NH 3 : 100 sccm, the total pressure was 2.85 Torr, the W / Mo diatomic anchored nitrogen-doped graphene composite was obtained after 3 h of reaction, W 3 Mo 17 -NG-3h.

[0042] like figure 1 Shown are the (002) and (100) diffraction peaks of the XRD pattern of the material, indicating that W 3 Mo 17 The presence of graphene and metal in NG-3h i...

Example Embodiment

[0045] Example 2

[0046] When the molar ratio of metal tungsten and molybdenum is 7:13. Pipette 15.98 mL of Dispersion A and accurately weigh 0.4281 g (NH 4 ) 6 Mo 7 O 24 •4H 2 O was placed in dispersion B for ultrasonic dispersion for 4 h, the pH of the solution was adjusted to > 6.0, and then the mixture was heated to 190 oC for 12 hours. After the reaction was completed, the hydrothermal kettle was cooled, the product was taken out, the columnar product was frozen in liquid nitrogen, and then dried in a freeze dryer for 30 h to obtain aerogel. Set the oven temperature to 800 o C, the gas flow is Ar: 150 sccm, NH 3 : 100 sccm, the total pressure was 2.85 Torr, the W / Mo diatomic anchored nitrogen-doped graphene composite was obtained after 3 h of reaction, W 7 Mo 13 -NG-3h.

[0047] like Figure 4 Shown is the SEM image of the material, which only shows the fluffy and wrinkled structure of graphene without nanoparticles, suggesting that the metal species exists ...

Example Embodiment

[0053] Example 3

[0054] When the molar ratio of metal tungsten and molybdenum is 7:13. Accurately pipette 15.98 mL of Dispersion A and accurately weigh 0.4281 g (NH 4 ) 6 Mo 7 O 24 •4H 2 O was placed in dispersion B for ultrasonic dispersion for 4 h, the pH of the solution was adjusted to > 6.0, and then the mixture was heated to 190 oC for 12 hours. After the reaction was completed, the hydrothermal kettle was cooled, the product was taken out, the columnar product was frozen in liquid nitrogen, and then dried in a freeze dryer for 30 h to obtain aerogel. Set the oven temperature to 800 o C, the gas flow is Ar: 150 sccm, NH 3 : 100 sccm, the total gas pressure was 2.85 Torr, the W / Mo diatomic anchored nitrogen-doped graphene composite was obtained after 5 h of reaction, W 7 Mo 13 -NG-5h.

[0055] like Figure 10 Shown are the (002) and (100) diffraction peaks of the XRD pattern of the material, indicating that W 7 Mo 13The existence of graphene and metal in N...

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Abstract

The invention discloses a non-noble metal diatomic electrocatalyst, and a preparation method and an application thereof. The catalyst contains, by mass, 1-7 parts of W, 1-7 parts of Mo, 79-81 parts ofC, 4-6 parts of N and 6-8 parts of O. Sodium tungstate and ammonium molybdate which are used as metal precursors and graphene rich in oxygen-containing functional groups undergo hydrothermal self-assembling, then the obtained material is freeze-dried, and a chemical vapor deposition process is carried out in an ammonia/argon atmosphere to prepare the W/Mo diatomic electrocatalyst, which interactswith nitrogen-doped graphene by oxygen atom anchoring. The non-noble metal diatomic electrocatalyst obtained in the invention has an electrocatalytic hydrogen evolution performance, and has the advantages of high activity, low initial potential, large current density, small Tafel slope, stable performances and the like.

Description

technical field [0001] The present invention relates to a non-noble metal diatomic electrocatalyst and its preparation method and application, in particular to an interactive W / Mo diatom composite material anchored in nitrogen-doped graphene by oxygen atoms, its preparation method and Its application in hydrogen production. The invention belongs to the technical field of catalyst preparation and application. Background technique [0002] Energy and the environment are the most important issues involved in the sustainable development of human society. Hydrogen is one of the ideal clean energy sources and an important chemical raw material, which has been widely valued by countries all over the world. So far, hydrogen energy mainly comes from water splitting to produce hydrogen, so how to improve the efficiency of water splitting to produce hydrogen has become a key problem to be solved urgently. For the hydrogen evolution reaction (HER), noble metals have excellent electro...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C25B1/04C25B11/06
CPCY02E60/36
Inventor 范修军杨洋董静张献明
Owner SHANXI UNIV
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