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Preparation method for hollow palladium nanospheres

A palladium nanometer and nanosphere technology, which is applied in the field of preparation of hollow palladium nanospheres, can solve the problems of scarcity of palladium reserves, reduce palladium and the like, and achieve the effects of excellent electrocatalytic activity and stability, high product yield and simple operation.

Inactive Publication Date: 2016-09-21
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method for hollow palladium nanospheres
  • Preparation method for hollow palladium nanospheres
  • Preparation method for hollow palladium nanospheres

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 number average molecular weight of 600 was replaced with 0.1 mL of 0.5 mol / L number average molecular weight of polyethyleneimine aqueous solution 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 preparation method for hollow palladium nanospheres. The preparation method comprises the steps that polyethyleneimine serves as a stabilizer, and ascorbic acid serves as a reducing agent; cuprous oxide nanospheres are synthesized at first; and then, the cuprous oxide nanospheres are used as a mold plate, hydrazine hydrate is used as a reducing agent, and potassium tetrachloropalladate or palladium chloride is reduced into the hollow palladium nanospheres which are regular in shape, uniform in size and good in dispersibility and stability through a hydrothermal reduction method. The preparation method for the hollow palladium nanospheres is simple and economical, and the prepared hollow palladium nanospheres show excellent electro-catalysis activity and stability to a formic acid catalytic reaction, have potential application prospects in the direct formic acid fuel cell field and are suitable for industrial large-scale 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 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 n...

Claims

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Application Information

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Patent Type & Authority Applications(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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