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Monatomic Pt-loaded tungsten oxide single-layer nanosheet catalyst with ultrahigh catalytic activity as well as preparation method and application thereof

A tungsten oxide monolayer, 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 high yield and utilization rate of Pt-based catalysts Low problems, to achieve the effects of high yield, stable catalyst structure, and high utilization efficiency

Active Publication Date: 2020-05-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Monatomic Pt-loaded tungsten oxide single-layer nanosheet catalyst with ultrahigh catalytic activity as well as preparation method and application thereof
  • Monatomic Pt-loaded tungsten oxide single-layer nanosheet catalyst with ultrahigh catalytic activity as well as preparation method and application thereof
  • Monatomic Pt-loaded tungsten oxide single-layer nanosheet catalyst with ultrahigh catalytic activity as well as preparation method and application thereof

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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 monatomic Pt-loaded tungsten oxide single-layer nanosheet catalyst with ultrahigh catalytic activity as well as a preparation method and an application thereof. The preparation method of the catalyst comprises the following steps: preparing a tungstate or metatungstate anion intercalation LDHs compound; calcining the tungstate radical or metatungstate radical anion intercalation LDHs compound to obtain a WO3 / MMO compound; then, carrying out acid dissolution to obtain WO3.H2O single-layer nanosheets; fully dispersing the WO3.H2O single-layer nanosheets in water, dropwise adding chloroplatinic acid, and after full adsorption, filtering, washing, drying and reducing in a reducing atmosphere to obtain the catalyst. According to the obtained catalyst, monatomic Pt is fully and effectively dispersed on the surface of the single-layer tungsten oxide nanosheets, and the efficiency of monatomic Pt can be brought into full play; Pt in the obtained catalyst has ultrahighcatalytic activity and long-time use stability under the condition of extremely low loading capacity.

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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IPC IPC(8): B01J23/652B01J35/10C25B11/06C25B1/04
CPCB01J23/6527C25B11/04C25B1/04B01J35/394B01J35/39B01J35/61Y02E60/36
Inventor 侯万国王德良李海平杜娜
Owner SHANDONG UNIV
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