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PtNi alloy/graphene combined nanometer catalyst with hollow structure and preparation method thereof

A graphene composite and nano-catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Catalyst interaction and other issues, to achieve excellent electron conductivity, excellent catalytic performance, the effect of reducing dosage

Inactive Publication Date: 2014-12-10
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The structure and physical and chemical properties of the support, such as electrical conductivity, surface groups, specific surface area, etc., will significantly affect the interaction between the support and the metal catalyst, thereby affecting the electrocatalytic performance of the catalyst.

Method used

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  • PtNi alloy/graphene combined nanometer catalyst with hollow structure and preparation method thereof
  • PtNi alloy/graphene combined nanometer catalyst with hollow structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1 mg graphene oxide was ultrasonically dispersed in 10 mL of polyvinylpyrrolidone (PVP) aqueous solution with a concentration of 10 g / L, and then 10 mL of nickel chloride solution with a concentration of 2 mmol / L was added, magnetically stirred, and high Pure nitrogen for 15 min. Then the temperature was controlled at 25 °C, and 30 mL of newly prepared sodium borohydride solution with a concentration of 50 mmol / L was added dropwise. Potassium acid solution, after the dropwise addition, continue to stir and react for 2 h. The reaction product was centrifuged, washed, and dried at 60 °C to obtain a hollow structure PtNi alloy / graphene composite nanocatalyst. The particle size of the PtNi nanoalloy hollow sphere was 10-50 nm, and the ratio of the amount of Pt to Ni was 5:1.

Embodiment 2

[0036]1 mg graphene oxide was ultrasonically dispersed in 10 mL of 20 g / L polyvinylpyrrolidone (PVP) aqueous solution, then 15 mL of 2 mmol / L nickel chloride solution was added, magnetically stirred, and high Pure nitrogen for 15 min. Then the temperature was controlled at 25 °C, and 30 mL of newly prepared sodium borohydride solution with a concentration of 50 mmol / L was added dropwise. Potassium acid solution, after the dropwise addition, continue to stir and react for 2 h. The reaction product was centrifuged, washed, and dried at 60 °C to obtain a hollow structure PtNi alloy / graphene composite nanocatalyst. The particle size of the PtNi nanoalloy hollow sphere was 10-50 nm, and the ratio of the amount of Pt to Ni was 3:1.

Embodiment 3

[0038] 2 mg graphene oxide was ultrasonically dispersed in 10 mL of 30 g / L polyvinylpyrrolidone (PVP) aqueous solution, then 20 mL of 2 mmol / L nickel chloride solution was added, magnetically stirred, and high-purity Nitrogen for 15 min. Then the temperature was controlled at 35 °C, and 20 mL of newly prepared sodium borohydride solution with a concentration of 50 mmol / L was added dropwise. Potassium acid solution, after the dropwise addition, continue to stir and react for 2 h. The reaction product was centrifuged, washed, and dried at 60 °C to obtain a hollow structure PtNi alloy / graphene composite nanocatalyst. The particle size of the PtNi nanoalloy hollow sphere was 10-50 nm, and the ratio of the amount of Pt to Ni was 2:1.

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Abstract

A PtNi alloy / graphene combined nanometer catalyst with a hollow structure adopts the graphene as a carrier and loads the PtNi alloy nanometer particles of which the grain diameter is 10-50 nm on the surface of the graphene, wherein the PtNi alloy nanometer particles are hollow spherical structures. The method for preparing the combined catalyst comprises the following steps: dispersing the graphene oxide in water liquor to which surfactant is added through ultrasound; uniformly mixing with soluble nickel salt (II); adding the reducing agent in inert gas atmosphere; adding soluble platinum salt (IV); stirring at 0-50 DEG C to execute the reduction reaction; centrifuging, washing and drying the reaction product to obtain the PtNi alloy / graphene combined nanometer catalyst with the hollow structure. The PtNi alloy / graphene combined nanometer catalyst with the hollow structure in the invention has good electro-catalytic property on electrochemical oxidation of methyl alcohol, and can be widely applied in methyl alcohol fuel cells.

Description

technical field [0001] The invention relates to a direct methanol fuel cell catalyst and a preparation method thereof, in particular to a hollow structure PtNi alloy / graphene composite nano catalyst and a preparation method thereof, which belong to the technical field of nano inorganic materials and the technical field of electrochemical energy. Background technique [0002] Methanol fuel cells have attracted widespread attention because of their simple structure, light weight, small size, high specific energy, and safe and convenient use. At present, in methanol fuel cells, most of the common catalysts are Pt, but there are still many shortcomings in the traditional Pt electrodes, which affect its commercialization process, such as: the reserves of Pt are limited and the price is expensive; in the anode catalytic process, organic Molecular dissociation Small molecules such as CO can poison the catalyst, leading to a decrease in catalyst efficiency. [0003] Many studies ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89H01M4/92
CPCY02E60/50
Inventor 胡耀娟吴萍蔡称心张卉
Owner NANJING NORMAL UNIVERSITY
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