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A kind of preparation method of hollow palladium nanosphere

A palladium nanometer and nanosphere technology, which is applied in the field of preparation of hollow palladium nanospheres, can solve problems such as reducing palladium and palladium reserves, and achieve the effects of high product yield, excellent electrocatalytic activity and stability, and good uniformity.

Inactive Publication Date: 2018-01-12
SHAANXI NORMAL UNIV
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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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  • A kind of preparation method of hollow palladium nanosphere
  • A kind of preparation method of hollow palladium nanosphere
  • A kind of preparation method of hollow palladium nanosphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of cuprous oxide nanospheres

[0030] Take 1mL of 0.05mol / L CuCl 2 Aqueous solution, 0.2mL 0.5mol / L polyethylenimine aqueous solution with a number average molecular weight of 600, 0.6mL 0.1mol / L ascorbic acid aqueous solution, add 10mL distilled water, stir and mix for 3 minutes, adjust with 0.5mol / L sodium hydroxide aqueous solution The pH value of the obtained mixed solution was 11.5, and stirred at room temperature for 20 minutes to obtain a cuprous oxide nanosphere solution.

[0031] 2. Preparation of hollow palladium nanospheres

[0032] After adjusting 0.45mL of 0.06mol / L potassium chloropalladate aqueous solution to pH 11.5 with 0.5mol / L sodium hydroxide aqueous solution, add it to the cuprous oxide nanosphere solution obtained in step 1, and add 15.5 μL mass fraction It is 80% hydrazine hydrate aqueous solution, heated to 60 DEG C in water bath, constant temperature reduction reaction for 30 minutes, then stirred at room temperature for 24 hour...

Embodiment 2

[0034] In Example 1, the copper chloride used is replaced with equimolar copper sulfate, and potassium chloropalladate is replaced with equimolar palladium chloride, and other steps are the same as in Example 1 to obtain hollow palladium nanospheres (see image 3 ).

Embodiment 3

[0036]In Example 1, 0.2 mL of 0.5 mol / L polyethyleneimine aqueous solution with a number average molecular weight of 600 was replaced with 0.1 mL of 0.5 mol / L polyethyleneimine aqueous solution with a number average molecular weight of 600, and other steps were the same as in Example 1 , to obtain hollow palladium nanospheres (see Figure 4 ).

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Abstract

The invention discloses a method for preparing hollow palladium nanospheres. In the method, polyethyleneimine is used as a stabilizer and ascorbic acid is used as a reducing agent to first synthesize cuprous oxide nanospheres, and then cuprous oxide nanospheres are used as templates, hydrazine hydrate As a reducing agent, potassium chloropalladate or palladium chloride is reduced into hollow palladium nanospheres with regular shape, uniform size, good dispersion and stability by using a hydrothermal reduction method. The preparation method of the invention is simple and economical, and the prepared hollow palladium nanospheres exhibit excellent electrocatalytic activity and stability for the formic acid catalytic reaction, have potential application prospects in the field of direct formic acid fuel cells, and are suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing palladium nanoparticles, in particular to a method for preparing hollow palladium nanospheres. The palladium nanoparticles are used as catalysts to exhibit higher catalytic activity and stability to formic acid. Background technique [0002] The proton exchange membrane fuel cell (PEMFC) using hydrogen as fuel has not yet been commercialized due to problems such as high price, no suitable hydrogen source, and freezing of the Nafion membrane below 0°C (Design of active Pt on TiO2 based nanofibrous cathode for superior PEMFC performance and durability at high temperature. Applied Catalysis B: Environmental, 2017; 204:421-429). 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 re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB82Y40/00B22F9/24B22F1/0549B22F1/0655B22F1/054
Inventor 陈煜汉术和
Owner SHAANXI NORMAL UNIV
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