Method for preparing palladium nano catalyst used for direct methanoic acid fuel cell

A formic acid fuel cell, palladium nanotechnology, applied in chemical instruments and methods, physical/chemical process catalysts, nanotechnology, etc., can solve the problems of difficult control of the particle size and distribution of metal particles, poor catalyst dispersion, etc.

Inactive Publication Date: 2012-04-25
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalyst prepared by this method has poor dispersion, and the particle size and distribution of metal particles are not easy to control.

Method used

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  • Method for preparing palladium nano catalyst used for direct methanoic acid fuel cell
  • Method for preparing palladium nano catalyst used for direct methanoic acid fuel cell
  • Method for preparing palladium nano catalyst used for direct methanoic acid fuel cell

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preparation example Construction

[0028] The invention discloses a preparation method of a palladium nano catalyst for a direct formic acid fuel cell, which comprises the following steps:

[0029] Disperse the carbon carrier in water to obtain a suspension;

[0030] Adding a guanidine salt ionic liquid and a palladium metal precursor to the suspension, and performing a coordination reaction between the guanidine salt ionic liquid and the palladium metal precursor to form a palladium-containing complex;

[0031] The palladium-containing complex compound and the reducing agent are reacted to form palladium nanoparticles, which are deposited on the surface of the carbon support, and washed and dried to obtain palladium nano-catalysts for direct formic acid fuel cells.

[0032] The carbon carrier used in the present invention can be a carbon carrier well known to those skilled in the art, such as activated carbon, carbon nanotubes, graphene, etc., and there is no particular limitation on its model, etc., preferably Vulcan-...

Embodiment 1

[0041] Add 45 mg of activated carbon to 100 mL of deionized water and ultrasonically shake for 2 hours to obtain a suspension of activated carbon;

[0042] Under stirring, 1mL of H containing 5mg Pd 2 PdCl 4 The solution and 10 mL of 37.6 mM tetramethyl dibutyl guanidine bromide aqueous solution were added to the suspension, and then the pH of the suspension was adjusted to about 5.5 with 5 wt% NaOH aqueous solution, and the tetramethyl dibutyl guanidine bromide Guanidine aqueous solution and H 2 PdCl 4 Coordination reaction occurs to form a palladium-containing complex;

[0043] After stirring the suspension for 5 hours, add 50 mL 1 mg mL -1 Newly prepared NaBH 4 The aqueous solution was added dropwise to the above suspension, and the reaction was carried out for about 5 hours to completely reduce the palladium metal precursor; then the suspension was filtered and washed with a large amount of deionized water, the resulting product was vacuum dried at 80°C for 10 hours, and then gr...

Embodiment 2

[0050] Preparation of 20wt% Pd / C catalyst

[0051] Add 50 mg of activated carbon to 100 mL of deionized water and ultrasonically shake for 2 hours to obtain a suspension of activated carbon;

[0052] Under stirring, 2.5mL of H 2 PdCl 4 Solution (5mg Pd mL -1 ) And 25mL of 37.6mM tetramethyldibutylguanidine bromide aqueous solution were added to the above suspension, and then the pH of the suspension was adjusted to about 5.5 with 5wt% NaOH aqueous solution, the tetramethyldibutylguanidine bromide aqueous solution and H 2 PdCl 4 Coordination reaction occurs to form a palladium-containing complex;

[0053] After the suspension was stirred for 5 hours, the newly prepared 125mL 1mg mL -1 NaBH 4 The aqueous solution was added dropwise to the above suspension, the reaction was carried out for about 5 hours to completely reduce the palladium metal precursor, then the suspension was filtered and washed with a large amount of deionized water, the resulting product was vacuum dried at 80°C for...

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Abstract

The invention discloses a preparation method for a palladium nano catalyst used for direct methanoic acid fuel cell. The guanidine salt ionic liquid is taken as a reaction raw material, the guanidine salt ionic liquid and a palladium metal precursor form a palladium-containing complex by coordination and the palladium-containing complex is taken as a novel nanoparticles precursor, nucleation rate is faster; in the subsequent growth process of nanoparticles, guanidine salt ionic liquid enables tight adsorption on the surface of the formed nanoparticles for providing electrostatic repulsion force and steric hindrance between the nanoparticles as well as inhibiting the mutual aggregation between the nanoparticles; on the other hand, guanidine salt ionic liquid has low surface tension, thereby the synthesis of palladium nano catalyst possesses faster nucleation rate and shorter Ostwald mature process. Accordingly, the palladium nano catalyst of the invention has characteristics of small particle size and narrow particle size distribution. Because the guanidine salt ionic liquid has weak absorption affinity on the surface of the palladium nanoparticles, the prepared palladium nano catalyst has high cleanliness, the palladium nano catalyst has high methanoic acid electrocatalytic activity.

Description

Technical field [0001] The invention relates to the technical field of catalysts, and more specifically, to a preparation method of a palladium nano catalyst for direct formic acid fuel cells. Background technique [0002] In recent years, direct methanol fuel cells have developed rapidly. However, due to the disadvantages of methanol, such as toxicity and flammability, people are trying to find more potential fuels to replace methanol. Compared with methanol, formic acid has the following advantages: First, formic acid is a strong dielectric that can promote the transmission of electrons and protons, and is particularly beneficial to increase the proton conductivity of the solution in the anode chamber. The permeability of the Nafion diaphragm is only 1 / of methanol. 5; Secondly, formic acid is non-toxic and a non-polluting environmentally friendly substance; thirdly, formic acid is not flammable, and it is safe and convenient to store and transport. Therefore, direct formic aci...

Claims

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Application Information

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IPC IPC(8): B01J23/44B82Y40/00H01M4/92
CPCY02E60/50
Inventor 赵晓祝建兵冯立纲胡洋姚世魁邢巍
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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