Method for preparing three-legged snail-shaped nano-palladium

A technology of nano-palladium and snails, which is applied in the field of preparation of palladium nanoparticles, can solve the problems of reducing the scarcity of palladium and palladium reserves, and achieve the effects of simple preparation method, excellent electrocatalytic activity and stability, and simple and easy preparation method

Inactive Publication Date: 2015-05-20
JIANGSU FUBANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the scarcity of palladium reserves, how to reduce the amount of palladium on the premise of improving the activity and selectivity of palladium-based catalysts is still a research hotspot in this field.

Method used

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  • Method for preparing three-legged snail-shaped nano-palladium
  • Method for preparing three-legged snail-shaped nano-palladium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method for tripod screw-shaped nano-palladium, comprising the following steps:

[0029] (1) Pipette 0.2 mL of 0.05 M ethylenediaminetetramethylenephosphonic acid (EDTMPA) solution and 0.12 mL of 0.05 M PdCl 2 solution, ultrasonically mixed to obtain EDTMPA-Pd II complex solution.

[0030] (2) To EDTMPA-Pd II 0.01 g of PVP and 0.5 mL of HCHO (40% wt aqueous solution, the same below) were added to the complex solution, and 7 mL of deionized water was added.

[0031] (3) Adjust the pH to 7 with 0.1 M NaOH solution under stirring, and then move it into a hydrothermal reaction kettle; place the reaction kettle in a drying oven at 140°C to make EDTMPA-Pd II The complex reacts completely with the reducing agent HCHO, and the metal Pd II After ion reduction, a black suspension was obtained, which was the target product.

[0032] (4) The product is then centrifuged, washed, and then dried in a vacuum oven to obtain the tripod helical nano-palladium.

Embodiment 2

[0034] A preparation method for tripod screw-shaped nano-palladium, comprising the following steps:

[0035] (1) Pipette 1.0 mL 0.05 M ethylenediaminetetramethylenephosphonic acid (EDTMPA) and 0.6 mL 0.05 M PdCl 2 solution, ultrasonically mixed to obtain EDTMPA-Pd II complex solution.

[0036] (2) To EDTMPA-Pd II Add 0.01 g PVP and 0.5 mL HCHO (40%) to the complex solution, and add 7 mL deionized water.

[0037] (3) Adjust the pH to 7 with 0.1 M NaOH solution under stirring, and then move it into a hydrothermal reactor; place the reactor in a drying oven at 140°C to make EDTMPA-Pd II The complex reacts completely with the reducing agent HCHO, and the metal Pd II After ion reduction, a black suspension was obtained, which was the target product.

[0038] (4) The product is then centrifuged, washed, and then dried in a vacuum oven to obtain the tripod helical nano-palladium.

Embodiment 3

[0040] A preparation method for tripod screw-shaped nano-palladium, comprising the following steps:

[0041] (1) Pipette 2.0 mL 0.05 M ethylenediaminetetramethylenephosphonic acid (EDTMPA) and 1.2 mL 0.05 M PdCl 2 solution, ultrasonically mixed to obtain EDTMPA-Pd II complex solution.

[0042] (2) To EDTMPA-Pd II Add 0.01 g PVP and 0.5 mL HCHO (40%) to the complex solution, and add 7 mL deionized water.

[0043] (3) Adjust the pH to 7 with 0.1 M NaOH solution under stirring, and then move it into a hydrothermal reactor; place the reactor in a drying oven at 140°C to make EDTMPA-Pd II The complex reacts completely with the reducing agent HCHO, and the metal Pd II After ion reduction, a black suspension was obtained, which was the target product.

[0044] (4) The product is then centrifuged, washed, and then dried in a vacuum oven to obtain the tripod helical nano-palladium.

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Abstract

The invention discloses a method for preparing three-legged snail-shaped nano-palladium. According to the invention, ethylene diamine tetramethylene phosphonic acid (EDTMPA) is taken as a chelating agent, polyvinylpyrrolidone (PVP) is taken as a stabilizing agent, and HCHO is taken as a reducing agent, and then a hydrothermal reduction method is adopted to reduce PdCl2 into three-legged snail-shaped palladium nano particles in regular shape and uniform size. Due to the unique structure, uniform size and favorable dispersity and stability, as a catalyst, the three-legged snail-shaped nano-palladium prepared by the invention has high reactivity and stability, and has a potential application prospect in the field of direct methanoic acid fuel cells. The preparation method is simple, economical, and suitable for industrialized mass production.

Description

technical field [0001] The invention relates to a preparation method of palladium nanoparticles, in particular to a preparation method of tripod-screw-shaped nano-palladium. As a catalyst, the palladium nanoparticles exhibit high catalytic activity and stability to formic acid. Background technique [0002] The proton exchange membrane fuel cell (PEMFC) using hydrogen as fuel has not been commercialized so far due to problems such as high price, no suitable hydrogen source, and freezing of Nafion membrane below 0 °C. Direct methanol fuel cell (DMFC) has the advantages of convenient fuel storage, transportation and use, small size and high specific energy, but methanol is toxic, volatile, highly flammable, and easily permeates Nafion membrane, causing battery performance to decline. Research in recent years has found that formic acid is a good substitute fuel for methanol, and direct formic acid fuel cell (DFAFC) has many advantages, such as formic acid is non-toxic and non-f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24H01M4/92B82Y40/00
CPCY02E60/50
Inventor 陈煜赵若鹏唐亚文陆天虹
Owner JIANGSU FUBANG PHARMA
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