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Mono-dispersed Pd-Pt nano-catalyst and preparation method therefor

A nanocatalyst, monodisperse technology, applied in chemical instruments and methods, physical/chemical process catalysts, nanotechnology for materials and surface science, etc., can solve problems such as reducing catalytic activity, improve catalytic performance, improve utilization rate effect

Inactive Publication Date: 2015-11-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Macromolecules adsorb on the surface of nanoparticles, greatly reducing the catalytic activity

Method used

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  • Mono-dispersed Pd-Pt nano-catalyst and preparation method therefor
  • Mono-dispersed Pd-Pt nano-catalyst and preparation method therefor
  • Mono-dispersed Pd-Pt nano-catalyst and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, the preparation of monodisperse Pt1Pd1 nanoparticle

[0033]Dissolve chloroplatinic acid and palladium chloride (the molar ratio of platinum to palladium is 1:1) in the mixed solution of formaldehyde and water (the volume ratio of formaldehyde and water is 1:1); Semisiloxane (the molar ratio of metal precursor to octaamic acid silsesquioxane is 1:1), use 5mol / L sodium hydroxide solution to adjust the pH value of the above mixed solution to 11 after ultrasonic oscillation, keep stirring The stabilizer is fully contacted and complexed with Pd ions and Pt ions to obtain an active metal precursor mixed solution; the prepared raw material solution is transferred to a hydrothermal reaction kettle, the reaction temperature is 180 ° C, and the reaction time is 6 h; the reduced The product was centrifugally washed with ultrapure water several times, and then dried in a vacuum dryer (60° C.), and the obtained solid product was uniformly dispersed Pt-Pd nano-catalyst...

Embodiment 2

[0034] Embodiment 2, the preparation of monodisperse Pt1Pd5 nanoparticles

[0035] Take chloroplatinic acid and palladium chloride (the molar ratio of platinum to palladium is 1:5) and dissolve them in the mixed solution of formaldehyde and water (the volume ratio of formaldehyde and water is 1:6); Semisiloxane (the molar ratio of metal precursor and octaamic acid group silsesquioxane is 1:6), use 5mol / L hydrochloric acid or 5mol / L sodium hydroxide solution to adjust the pH value of the above mixed solution after ultrasonic oscillation To 7, keep stirring to fully contact and complex the stabilizer with Pd ions and Pt ions to obtain a mixed liquid of active metal precursor; transfer the prepared raw material liquid to a hydrothermal reaction kettle, the reaction temperature is 100°C, and the reaction time is 9h ; The reduced product is centrifugally washed with ultrapure water several times, and then dried in a vacuum desiccator (60° C.), and the obtained solid product is unif...

Embodiment 3

[0036] Embodiment 3, preparation of monodisperse Pt1Pd10 nanoparticles

[0037] Dissolve chloroplatinic acid and palladium chloride (the molar ratio of platinum to palladium is 1:10) in the mixed solution of formaldehyde and water (the volume ratio of formaldehyde and water is 1:3); Semisiloxane (the molar ratio of metal precursor and octaamic acid silsesquioxane is 1:3), use 5mol / L hydrochloric acid or 5mol / L sodium hydroxide solution to adjust the pH value of the above mixed solution after ultrasonic oscillation To 3, keep stirring to fully contact and complex the stabilizer with Pd ions and Pt ions to obtain a mixed liquid of active metal precursor; transfer the prepared raw material liquid to a hydrothermal reaction kettle, the reaction temperature is 140°C, and the reaction time is 12h ; The reduced product is centrifugally washed with ultrapure water several times, and then dried in a vacuum desiccator (60° C.), and the obtained solid product is uniformly dispersed Pt-Pd...

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Abstract

The invention discloses a mono-dispersed Pd-Pt nano-catalyst and a preparation method therefor. According to the invention, with H2PtCl6.6H2O and PdCl2 as metal precursors, octa(amidocarboxyl silsesquioxane) as a protecting agent, and formaldehyde as a reducing agent, the mono-dispersed Pd-Pt nano-catalyst is prepared by a hydrothermal method. The prepared nano-catalyst has the advantages of good dispersing performance, higher electrochemical active specific surface area, and high electrocatalytic activity. The preparation provided by the invention is simple in required equipment and convenient in operation, and has great utilization value in a commercialization process of direct formic acid fuel cells.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalysts, and relates to a monodisperse Pt-Pd nanometer catalyst and a preparation method thereof. Background technique [0002] In recent years, due to the increasing energy demand, the depletion of fossil fuels and the increasing global environmental pollution, the development of efficient and pollution-free green energy and energy conversion equipment has attracted more and more attention. Fuel cell is an energy conversion device that converts chemical energy into electrical energy without combustion. It has the advantages of high efficiency, cleanliness, and quick start. It is a new type of continuous power generation technology following hydropower, thermal power, and nuclear power. Among them, direct formic acid fuel cells, which use formic acid instead of methanol and hydrogen as fuel, have attracted extensive attention from the scientific community due to the non-toxicity of formic acid...

Claims

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Application Information

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IPC IPC(8): B01J23/44B82Y30/00B82Y40/00H01M4/92
CPCY02E60/50
Inventor 王怡红郝福瑞姚琛魏术海
Owner SOUTHEAST UNIV
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