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A single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst with ultra-high catalytic activity and its preparation method and application

A tungsten oxide single-layer, catalytically active technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low utilization rate of Pt-based catalysts and low yield Advanced problems, to achieve the effect of stable catalyst structure, high yield and simple synthesis process

Active Publication Date: 2021-07-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of the present invention is simple to operate, environment-friendly, easy to realize and industrialize, low in cost and high in yield; the obtained catalyst is single-atom Pt fully and effectively dispersed on the surface of single-layer tungsten oxide nanosheets, has a large specific surface area, and has a large number of active sites point, can give full play to the efficiency of single-atom Pt; Pt in the obtained catalyst is under the condition of extremely low loading (loading is about 1wt% of commercial Pt / C (20wt%)), that is, it can achieve a higher than commercial Pt / C ( The HER performance of Pt content is 20wt%), and its mass catalytic activity is 160 times higher than that of commercial Pt / C (the mass catalytic activity of existing Pt-based catalysts is up to 40 times that of commercial Pt / C (Pt content of 20wt%)) The highly dispersed and stable structure of single-atom Pt in the catalyst obtained by the present invention not only ensures ultra-high catalytic activity and long-term service stability, but also solves the difficult problem of low utilization rate of current Pt-based catalysts

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  • A single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst with ultra-high catalytic activity and its preparation method and application
  • A single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst with ultra-high catalytic activity and its preparation method and application
  • A single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst with ultra-high catalytic activity and its preparation method and application

Examples

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Embodiment 1

[0053] A method for preparing a single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst with ultrahigh catalytic activity, comprising the steps of:

[0054] Preparation of metatungstate anion intercalation LDHs complex by ion exchange method:

[0055] Take 10.2g Mg(NO 3 ) 2 ·6H 2 O and 7.6g Al(NO 3 ) 3 9H 2 O was dissolved in 200ml deionized water to obtain solution A. Take 6.4g NaOH and dissolve in 100ml deionized water to obtain solution B. Solutions A and B were simultaneously added dropwise to 50 ml of degassed deionized water C under stirring conditions, and the pH was controlled to be 10.0 under nitrogen protection. After stirring at room temperature for 30 min, it was aged in an oven at 80° C. under nitrogen protection for 12 h. After filtration, washing, and vacuum drying at 60°C for 12 hours, NO 3 - Intercalated LDHs. Weigh 5.0g of prepared LDHs and 5.0g of ammonium metatungstate into 100ml of degassed deionized water, N 2 Under protection,...

Embodiment 2

[0065] A method for preparing a single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst with ultrahigh catalytic activity, as described in Example 1, the difference is: 2g WO 3 ·H 2 O single-layer nanosheets are fully dispersed in 100ml of pure water, under stirring conditions, after adding 20ml (concentration is 2g / L) aqueous solution of chloroplatinic acid dropwise, continue to stir for 10h, then obtain chloroplatinic acid through filtration, washing and freeze-drying Adsorbed WO 3 ·H 2 O monolayer nanosheets; the obtained nanosheets were placed in a tube furnace under Ar / H 2 Under atmosphere, calcined at 400°C for 1h, the heating rate was 2°C / min, and after natural cooling, a single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst was obtained, that is, single-atom Pt / WO 3 Single-layer nanosheets (referred to as single-atom Pt / WO 3 -400°C monolayer nanosheets). Other steps and conditions are consistent with Example 1.

[0066] The loadi...

Embodiment 3

[0068] A method for preparing a single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst with ultrahigh catalytic activity, as described in Example 1, the difference is: 2g WO 3 ·H 2 O single-layer nanosheets are fully dispersed in 100ml of pure water, under stirring conditions, after adding 20ml (concentration is 2g / L) aqueous solution of chloroplatinic acid dropwise, continue to stir for 10h, then obtain chloroplatinic acid through filtration, washing and freeze-drying Adsorbed WO 3 ·H 2 O monolayer nanosheets; the obtained nanosheets were placed in a tube furnace under Ar / H 2 Under atmosphere, calcined at 500°C for 1h, the heating rate was 2°C / min, and after natural cooling, a single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst was obtained, that is, single-atom Pt / WO 3 Single-layer nanosheets (referred to as single-atom Pt / WO 3 -500°C monolayer nanosheets). Other steps and conditions are consistent with Example 1.

[0069] The loadi...

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Abstract

The invention provides a single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst with ultrahigh catalytic activity, a preparation method and application thereof. The preparation method of the catalyst of the present invention is as follows: preparation of tungstate or metatungstate anion intercalation LDHs composite; tungstate or metatungstate anion intercalation LDHs composite is calcined to obtain WO 3 / MMO complex; then acid-dissolved to obtain WO 3 ·H 2 O monolayer nanosheets; WO 3 ·H 2 O single-layer nanosheets are fully dispersed in water, chloroplatinic acid is added dropwise, and after fully adsorbed, the catalyst is obtained by filtering, washing, drying, and reducing under a reducing atmosphere. The obtained catalyst of the present invention is that single-atom Pt is fully and effectively dispersed on the surface of the single-layer tungsten oxide nanosheet, and the efficiency of single-atom Pt can be fully utilized; the Pt in the obtained catalyst has ultra-high catalytic activity and Long-term use stability.

Description

technical field [0001] The invention relates to a single-atom Pt-supported tungsten oxide single-layer nanosheet catalyst with ultrahigh catalytic activity, a preparation method and application thereof, and belongs to the field of nanomaterial preparation. Background technique [0002] In the electrocatalytic reaction, the hydrogen evolution reaction (HER) is an important half-reaction of electrocatalytic water splitting, and it is one of the methods of hydrogen production. Compared with the traditional fossil fuel hydrogen production method, it has the advantages of green, pollution-free and sustainable development. The most important hydrogen production method other than steam reforming hydrogen production. The noble metal platinum (Pt) and its alloys are currently one of the most common electrocatalysts for HER due to their good catalytic activity. Due to the scarcity, high price and irreplaceability of Pt resources in many catalytic reactions, improving the utilization ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/652B01J35/10C25B11/093C25B1/04
CPCB01J23/6527B01J35/004B01J35/0066B01J35/1004C25B1/04C25B11/04Y02E60/36
Inventor 侯万国王德良李海平杜娜
Owner SHANDONG UNIV
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