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Pt nanoparticle loaded molybdenum dioxide/nickel hydroxide nanosheet array structure material, preparation method and application thereof

A nanosheet array and nanoparticle technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problem of uniform deposition, non-elimination or reduction of Pt nanoparticles Schottky barrier and other issues

Active Publication Date: 2020-10-27
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the synthesis methods of Pt nanoparticles-supported metal hydroxide catalysts are mostly complex two-step reactions, it is difficult to uniformly deposit Pt nanoparticles on pre-prepared supports, and the Schottky Potential Barrier Negative Effects on Material Properties

Method used

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  • Pt nanoparticle loaded molybdenum dioxide/nickel hydroxide nanosheet array structure material, preparation method and application thereof
  • Pt nanoparticle loaded molybdenum dioxide/nickel hydroxide nanosheet array structure material, preparation method and application thereof
  • Pt nanoparticle loaded molybdenum dioxide/nickel hydroxide nanosheet array structure material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of Pt nanoparticles loaded with MoO 2 / Ni(OH) 2 The preparation method of the nanosheet array material includes the following steps:

[0047] Soak 2×3cm foam nickel in 6M hydrochloric acid solution for 15 minutes, and wash foam nickel 3 times with deionized water and absolute ethanol;

[0048] Accurately measure 30mL ammonia water into a 50mL clean small beaker, and then add 1.4mmol Ni(NO 3 ) 2 ·6H 2 O, 0.35mmol(NH 4 ) 6 Mo 7 O 24 ·4H 2 O, 0.05mL H with a concentration of 0.03M 2 PtCl 6 Solution and 2mmol NaBH 4 After stirring for 10 min, add 10 mL of anhydrous methanol. After stirring for 5 minutes, add 0.35mL of 0.03M H 2 PtCl 6 Solution, continue to stir for 1-2 min to obtain a homogeneous solution;

[0049] Transfer the solution to a 50mL polytetrafluoroethylene-lined stainless steel reactor, put the clean foamed nickel into the solution obliquely, seal and react in a 150℃ oven for 8h. After the reaction is over, cool to room temperature naturally and cover The foa...

Embodiment 2

[0059] Pt nanoparticles loaded with MoO 2 / Ni(OH) 2 The preparation method of the nanosheet array material includes the following steps:

[0060] Soak 2×3cm foam nickel in 6M hydrochloric acid solution for 15 minutes, and wash foam nickel 3 times with deionized water and absolute ethanol;

[0061] Accurately measure 30mL ammonia water into a 50mL clean small beaker, add 1.4mmol Ni(NO 3 ) 2 ·6H 2 O, 0.35mmol(NH 4 ) 6 Mo 7 O 24 ·4H 2 O, 0.05mL H with a concentration of 0.03M 2 PtCl 6 Solution and 2mmol NaBH 4 After stirring for 10 min, add 10 mL of anhydrous methanol. After stirring for 5 minutes, add 0.25mL or 0.45mL of 0.03M H 2 PtCl 6 Solution, continue to stir for 1-2 min to obtain a homogeneous solution;

[0062] Transfer the solution to a 50mL polytetrafluoroethylene-lined stainless steel reactor, put the clean foamed nickel into the solution obliquely, seal and react in a 150℃ oven for 8h. After the reaction is over, cool to room temperature naturally and cover The nickel foam ...

Embodiment 3

[0067] A kind of Pt nanoparticles loaded with MoO 2 / Ni(OH) 2 Application of nanosheet materials as hydrogen evolution reaction (HER) catalyst.

[0068] The specific application method is: load MoO on the Pt nanoparticles obtained in each embodiment with an area of ​​0.5×0.5cm. 2 / Ni(OH) 2 The nanosheet material is used as the working electrode, the carbon rod is used as the counter electrode, the Ag / AgCl electrode is used as the reference electrode, and the CHI 760E electrochemical workstation is used for testing in 1.0M KOH electrolyte solution. Using linear sweep voltammetry (LSV) at 5.0mV·s -1 The polarization curve is obtained at the scanning rate of 90% and the ohmic compensation is 90%, and the polarization curve is obtained with Pt / C, MoO 2 / Ni(OH) 2 Nanosheet material (MoO 2 / Ni(OH) 2 The preparation of the nanosheet material is compared with the preparation method in Example 1, omitting the chloroplatinic acid solution in the raw material) as a working electrode for compa...

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Abstract

The invention discloses a Pt nanoparticle loaded molybdenum dioxide / nickel hydroxide nanosheet array structure material, a preparation method and application thereof. The preparation method comprisesthe following steps of: dissolving a nickel salt, a molybdenum salt, a reducing agent and a platinum source aqueous solution in ammonia water, adding methanol, uniformly stirring the substances, continuously adding the platinum source aqueous solution, uniformly mixing the substances, transferring the mixed solution into a reaction kettle, obliquely putting foamed nickel into the solution, carrying out solvothermal reaction, performing cooling to room temperature after the reaction is finished, and washing and drying the product to obtain a product. MoO2 in the product has metallicity, so thatMoO2 exists in the material as an electron donor, Schottky barriers between Ni(OH)2 and a foamed nickel substrate and between Ni(OH)2 and Pt nanoparticles are greatly reduced, and electron transfer in the reaction process is accelerated; meanwhile, high-valence Mo ions can well stabilize active Ni<2+> ions on an interface, so that the catalytic stability of the material is further improved; as acathode catalyst material for hydrogen evolution or total hydrolysis reaction, the catalyst has the advantages of high catalytic activity, excellent stability and simple preparation process.

Description

Technical field [0001] The invention belongs to the field of nano material preparation methods and electrocatalysis applications, and specifically relates to a Pt nano particle loaded MoO 2 / Ni(OH) 2 Nanosheet array structure material and its preparation method and application. Background technique [0002] Hydrogen energy is a pollution-free and sustainable clean energy. Hydrogen produced by electrolysis of water in alkaline environment is one of the important sources of hydrogen. As we all know, Pt is an excellent hydrogen evolution reaction catalyst. However, the low hydrolysis efficiency and high cost of Pt surface in alkaline environment make it difficult to apply to industrial production applications on a large scale. Since the performance of non-noble metal electrocatalysts reported so far is generally lower than that of Pt-based catalysts, it is a feasible method to reduce the amount of Pt while increasing the overall hydrolysis efficiency of the material. [0003] Trans...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J37/10B82Y30/00C25B1/04C25B11/06
CPCB01J23/8993B01J37/10B82Y30/00C25B1/04B01J35/33Y02E60/36
Inventor 吴正翠张吴正知高峰
Owner ANHUI NORMAL UNIV
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