Preparation method of polyethyleneimine functional multi-branched nanometer triangular Pt catalyst

A polyethylenimine and functionalization technology, which is applied in the field of preparation of multi-branched nano-triangular Pt catalysts, can solve the problems hindering the commercial development of electrolyzed water hydrogen production technology, the high price of Pt black catalysts, and low catalytic activity, achieving Excellent catalytic stability, inhibition of Ostwalder ripening effect, simple and easy preparation method

Active Publication Date: 2017-11-07
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, noble metal Pt nanoparticles are considered to be the best catalysts for the electrolysis of water to produce hydrogen, but commercial Pt black catalys

Method used

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  • Preparation method of polyethyleneimine functional multi-branched nanometer triangular Pt catalyst
  • Preparation method of polyethyleneimine functional multi-branched nanometer triangular Pt catalyst
  • Preparation method of polyethyleneimine functional multi-branched nanometer triangular Pt catalyst

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Experimental program
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Effect test

Embodiment 1

[0023] Mix 5 mL of 0.01 mol / L aqueous solution of potassium chloroplatinite with 5 mL of 0.2 mol / L aqueous solution of polyethyleneimine with a number average molecular weight of 70,000, adjust the pH of the mixture to 8 with 0.1 mol / L hydrochloric acid, and heat to 80°C, add 1mL of hydrazine hydrate aqueous solution with a mass fraction of 85%, let stand at 80°C for 15 hours under normal pressure, and centrifuge and wash the obtained black suspension 3 to 5 times with a high-speed centrifuge at a speed of 10,000 rpm Afterwards, it was dried in a vacuum oven at 60° C. for 12 hours to obtain a multi-branched nanotriangular Pt catalyst functionalized with polyethyleneimine. Depend on figure 1 It can be seen that the obtained sample has a planar multi-branched nano-triangular structure, which greatly improves the utilization rate of the noble metal Pt.

Embodiment 2

[0025] Mix 5 mL of 0.01 mol / L aqueous solution of potassium chloroplatinite with 5 mL of 0.3 mol / L aqueous solution of polyethyleneimine with a number average molecular weight of 70,000, adjust the pH of the mixture to 8 with 0.1 mol / L hydrochloric acid, and heat to 80°C, add 1mL of hydrazine hydrate aqueous solution with a mass fraction of 85%, let stand at 80°C for 15 hours under normal pressure, and centrifuge and wash the obtained black suspension 3 to 5 times with a high-speed centrifuge at a speed of 10,000 rpm Afterwards, dry in 60 ℃ of vacuum ovens for 12 hours, obtain polyethylenimine functionalized multi-branched nano-triangular Pt catalyst (see figure 2 ).

Embodiment 3

[0027] Mix 5mL of 0.01mol / L aqueous solution of potassium chloroplatinite with 5mL of 0.2mol / L aqueous solution of polyethyleneimine with a number average molecular weight of 70000, adjust the pH of the mixture to 10 with 0.1mol / L hydrochloric acid, and heat to 80°C, add 1mL of hydrazine hydrate aqueous solution with a mass fraction of 85%, let stand at 80°C for 15 hours under normal pressure, and centrifuge and wash the obtained black suspension 3 to 5 times with a high-speed centrifuge at a speed of 10,000 rpm Afterwards, dry in 60 ℃ of vacuum ovens for 12 hours, obtain polyethylenimine functionalized multi-branched nano-triangular Pt catalyst (see image 3 ).

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Abstract

The invention discloses a preparation method of a polyethyleneimine functional multi-branched nanometer triangular Pt catalyst. According to the method, polyethyleneimine is used as a transmission medium of a guiding agent, a stabilizing agent, functional high molecules and H<+> protons; the pH value is regulated to the proper value; hydrazine hydrate is used as a reducing agent; a method of performing heating in a water solution is used for reducing PtCl4<2-> into the polyethyleneimine functional multi-branched nanometer triangular Pt catalyst with regular shape and high yield. The prepared Pt catalyst has the unique three-dimensional structure and surface structure; in addition, the used polyethyleneimine is a macromolecular amine polymer with the smallest carbon to nitrogen ratio; the transmission efficiency of the H<+> proton is greatly improved through the rich -NH<3+> on the surface, so that good catalysis activity is shown on the HER. The preparation method of the polyethyleneimine functional multi-branched nanometer triangular Pt catalyst has the advantages that the preparation method is simple and economical; the method is suitable for industrial mass production.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method of a multi-branched nano-triangular Pt catalyst functionalized with polyethyleneimine. The catalyst exhibits higher catalytic activity and stability for hydrogen evolution reaction, which is much higher than Commercial Pt black currently on the market. Background technique [0002] In today's "hydrogen economy" society, hydrogen production by electrolysis of water is regarded as the most promising hydrogen production technology. The design and synthesis of highly active and stable hydrogen evolution reaction (HER) electrocatalysts play a key role in the development of "hydrogen economy". At present, noble metal Pt nanoparticles are considered to be the best catalysts for electrolyzing water to produce hydrogen, but commercial Pt black catalysts are expensive, have low catalytic activity, and poor stability, which seriously hinder the...

Claims

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Application Information

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IPC IPC(8): B01J31/06C25B1/04C25B11/06
CPCB01J31/069C25B1/04C25B11/075Y02E60/36
Inventor 陈煜徐广蕊
Owner SHAANXI NORMAL UNIV
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