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Three-dimensional nitrogen-doped graphene platinoid-loaded composite electro-catalyst and preparation method thereof

A nitrogen-doped graphene and electrocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, circuits, etc., can solve the problem of uncontrollable catalyst particles, and improve the ability of direct electrocatalytic oxidation of methanol, raw materials Easy to obtain, high yield effect

Inactive Publication Date: 2015-02-18
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is easy to produce uncontrollable catalyst particles caused by uneven concentration of local reducing agent solution.

Method used

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  • Three-dimensional nitrogen-doped graphene platinoid-loaded composite electro-catalyst and preparation method thereof
  • Three-dimensional nitrogen-doped graphene platinoid-loaded composite electro-catalyst and preparation method thereof
  • Three-dimensional nitrogen-doped graphene platinoid-loaded composite electro-catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take graphene oxide flakes and ultrasonically disperse them in aqueous solution, then add urea and nickel nitrate and mix well, the content of graphene flakes in the mixture is 2.5mg / ml, the concentration of urea is 1g / ml, and the dosage is 6ml, Ni 2+The concentration is 0.59mg / ml; the dosage is 0.6ml; the mixture is transferred to a hydrothermal reactor, kept at 180 degrees Celsius for 12h, then soaked in distilled water for 3 to 5 days, and freeze-dried to obtain a three-dimensional nitrogen-doped graphene ,Such as figure 1 shown. Get 8 milligrams of prepared three-dimensional nitrogen-doped graphene and dissolve in ethylene glycol, then add 0.53ml chloroplatinic acid, the concentration of chloroplatinic acid is 3.7mg / L, 3.5mg copper chloride dihydrate, 10mg glutamic acid, Mix well and stir at room temperature for one day. The above mixture was adjusted to pH 13 with NaOH (dissolved in ethylene glycol), then heated in a microwave at 800W for 5 minutes, centrifuged, ...

Embodiment 2

[0040] Take graphene oxide flakes and ultrasonically disperse them in an aqueous solution, then add urea and nickel chloride, and mix well, the content of graphene flakes in the mixture is 3mg / ml, the concentration of urea is 1g / ml, and the amount of Ni 2+ The concentration is 0.59 mg / ml; the dosage is 0.6 ml; the mixture is transferred to a hydrothermal reactor, kept at 180 degrees Celsius for 24 hours, then soaked in distilled water for 3 to 5 days, and freeze-dried to obtain three-dimensional nitrogen-doped graphene. Get 16 mg of the prepared three-dimensional nitrogen-doped graphene and dissolve it in ethylene glycol, then add 1.06 ml of chloroplatinic acid, the concentration of chloroplatinic acid is 3.7 mg / L, 7.0 mg of copper chloride dihydrate, 10 mg of glutamic acid , mix well, and stir at room temperature for one day. The above mixture was adjusted to pH 13 with NaOH (dissolved in ethylene glycol), and then heated in a microwave at 1000W for 2 minutes, centrifuged, wa...

Embodiment 3

[0045] Take graphene oxide flakes and ultrasonically disperse them in an aqueous solution, then add urea and nickel sulfate, and mix well. 2+ The concentration is 0.59mg / ml; the dosage is 0.9ml; the mixture is transferred to a hydrothermal reactor, kept at 180 degrees Celsius for 24 hours, then soaked in distilled water for 3 to 5 days, and freeze-dried to obtain a three-dimensional nitrogen-doped graphene . Take 16 mg of the prepared three-dimensional nitrogen-doped graphene and dissolve it in ethylene glycol, then add 1.06 ml of chloroplatinic acid, the concentration of chloroplatinic acid is 3.7 mg / mL, 7.1 mg of copper chloride dihydrate, 20.1 mg of glutamic acid acid, mix well, and stir at room temperature for a day. The above mixture was adjusted to pH 13 with NaOH (dissolved in ethylene glycol), and then heated in microwave at 500W for 8 minutes, centrifuged, washed, and freeze-dried to obtain three-dimensional nitrogen-doped graphene-supported platinum-copper (PtCu / 3D-...

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Abstract

The invention discloses a three-dimensional nitrogen-doped graphene platinoid-loaded composite electro-catalyst. A preparation method comprises the following steps of ultrasonically dispersing graphene oxide sheet in an aqueous solution, adding urea and soluble nickel salt for full and uniform mixing, transferring the mixture into a hydrothermal reaction kettle for reaction, performing freeze-drying to obtain three-dimensional nitrogen-doped graphene, dissolving the three-dimensional nitrogen-doped graphene in ethylene glycol, sequentially adding chloroplatinic acid, copper chloride dehydrate and glutamic acid, and performing microwave reaction to obtain the catalyst. The method has the characteristics of that energy is saved, the speed is high, and the operation is simple; the raw materials are easy to obtain, the yield is high, the capability of platinum in the direct electro-catalytic oxidation of methanol under an acidic condition can be remarkably improved, peak current is 3 to 4 times than that of a commercial carbon black platinum-loaded electro-catalyst and a commercial carbon black platinum-ruthenium-loaded electro-catalyst, and the prepared catalyst is widely applied to a methanol fuel cell.

Description

technical field [0001] The invention relates to a three-dimensional nitrogen-doped graphene-supported platinum-copper (PtCu / 3D-N-G) composite electrocatalyst for direct methanol fuel cells and a preparation method thereof, belonging to the field of energy materials. Background technique [0002] At present, the whole world is facing energy crises such as the shortage of oil resources, and the environmental pollution caused by the burning of a large amount of fossil fuels has posed a serious threat to the survival of organisms. Therefore, it is very urgent to find an alternative clean energy source. As a clean energy source, direct methanol fuel cell (DMFC) has the advantages of simple structure, high energy conversion efficiency, easy to obtain raw materials, easy to carry, and no pollution to the air. [0003] As we all know, fuel cell technology relies heavily on electrocatalysts, and good electrocatalysts can reduce their electrochemical overpotential to obtain high volt...

Claims

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Application Information

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IPC IPC(8): B01J27/24H01M4/90
CPCY02E60/50
Inventor 赵彦春彭杏兰王晓田建袅
Owner GUANGXI NORMAL UNIV
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