Preparation method of nanometer palladium-graphene three-dimensional porous composite electrocatalyst

A three-dimensional porous, electrocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Difficult application occasions and other problems, to achieve the effect of increased specific surface area, wide source of raw materials and low cost

Active Publication Date: 2015-04-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, further studies have shown that the catalysts obtained by the above preparation process are likely to have unsatisfactory catalytic alcohol performance and low stability due to the large particle size of the metal palladium crystals and the small specific surface area of ​​the carbon support. The process is relatively cumbersome and difficult to adapt to large-scale batch industrial applications, thus becoming an important unfavorable factor that directly affects the commercial development of energy conversion devices such as alcohol fuel cells

Method used

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  • Preparation method of nanometer palladium-graphene three-dimensional porous composite electrocatalyst
  • Preparation method of nanometer palladium-graphene three-dimensional porous composite electrocatalyst
  • Preparation method of nanometer palladium-graphene three-dimensional porous composite electrocatalyst

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Embodiment 1

[0027] First cut the nickel foam into a size such as 1cm (length) X 1cm (width) X 1mm (height), then clean it with glacial acetic acid, acetone and ethanol, then wash it with deionized water for 5 minutes and then dry it ;

[0028] Next, the oxidation exfoliation method (Hummers method) is preferably used to prepare a graphene oxide aqueous solution with a mass concentration of 0.5 mg / mL to 10 mg / mL. The specific process is as follows: take 1 g of natural flake graphite powder, mix it with 23 mL of concentrated sulfuric acid and 0.5 The sodium nitrate of 2g was stirred and mixed under ice-bath conditions, then slowly added 3g potassium permanganate to the solution, after stirring for 2 hours, the temperature was raised to 35 degrees, after continuing to stir for 2 hours, slowly added 46mL of deionized water, Then the temperature was further raised to 95 degrees and maintained for 30 minutes, then about 100mL of deionized water was added to the solution, the temperature was adj...

Embodiment 2

[0032] First cut the nickel foam into a size such as 1cm (length) X 1cm (width) X 1mm (height), then clean it with glacial acetic acid, acetone and ethanol, then wash it with deionized water for 5 minutes and then dry it ;

[0033] Next, it is preferred to use the oxidation exfoliation method (Hummers method) to prepare the graphene oxide aqueous solution, and adjust its key parameters to a mass concentration of 0.5 mg / mL, and then directly soak the foamed nickel after cleaning and let it stand for reaction, wherein the overall system The reaction temperature is controlled at 80°C, and the soaking time is 12 hours. During this process, the nickel foam as the substrate directly reduces graphene oxide during soaking, and deposits and grows graphene on the surface of the nickel foam. After the reaction, take it out Foam nickel, and wash the surface with deionized water to form a three-dimensional porous nickel foam-graphene product;

[0034] Next, the foamed nickel-graphene prod...

Embodiment 3

[0036] First cut the nickel foam into a size such as 1cm (length) X 1cm (width) X 1mm (height), then clean it with glacial acetic acid, acetone and ethanol, then wash it with deionized water for 5 minutes and then dry it ;

[0037] Next, preferably adopt oxidation exfoliation method (Hummers method) to prepare graphene oxide aqueous solution, and its key parameter is adjusted to mass concentration 6mg / mL, then the foamed nickel after cleaning is directly soaked wherein standstill reaction, wherein the whole system The reaction temperature was controlled at 30°C, and the soaking time was 8 hours. During this process, the nickel foam used as the substrate directly reduced graphene oxide during soaking, and deposited and grew graphene on the surface of the nickel foam. After the reaction, the foam was taken out Nickel, and the surface is cleaned with deionized water to form a foamed nickel-graphene product with a three-dimensional porous structure;

[0038] Next, the foamed nick...

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Abstract

The invention discloses a preparation method of a nanometer palladium-graphene three-dimensional porous composite electrocatalyst. The preparation method comprises the following steps: cleaning foamed nickel by sequentially adopting glacial acetic acid, acetone, ethanol and deionized water; preparing a graphene oxide water solution with the mass concentration of 0.5-10 mg/mL, then directly soaking the foamed nickel into the graphene oxide water solution, and standing for reaction to form a three-dimensional porous structural foamed nickel-graphene product; directly soaking the foamed nickel-graphene product into a potassium chloropalladate water solution with the molar concentration of 0.05-1 mmol/L; and after the reaction is finished, taking out the foamed nickel-graphene product so as to generate a graphene composite electrocatalyst product which has a three-dimensional porous structure and is loaded with a palladium nanoparticle. By the preparation method disclosed by the invention, the three-dimensional porous graphene foamed product loaded with the palladium nanoparticle can be obtained only through simple two-step soaking operation; and in addition, the three-dimensional porous graphene foamed product is excellent in property and high in stability and can be directly used as the positive pole of an ethanol fuel cell.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and more specifically relates to a method for preparing a nano-palladium-graphene three-dimensional porous composite electrocatalyst. Background technique [0002] With the rapid development of the global economy, the three major threats of energy shortage, abnormal climate and environmental pollution are becoming more and more serious. It is imperative to develop new, efficient and environmentally friendly energy key materials. As a green energy technology, fuel cells are rapidly becoming a renewable energy development. one of the focus areas. Direct alcohol fuel cells have attracted great attention because the fuel can be directly used for power generation without reforming, and has the advantages of high energy density, low price, small size, and easy portability. [0003] At present, the electrocatalysts of direct alcohol fuel cells are mainly noble metal platinum and its alloys, but plat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J35/10H01M4/90
CPCY02E60/50
Inventor 王帅张哲野
Owner HUAZHONG UNIV OF SCI & TECH
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