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Transition metal phosphide porous carbon nanosheet composites and their preparation and application

A technology of composite materials and transition metals, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of limited price of platinum resources, low electronic conductivity, and few exposed active sites, and is suitable for large-scale production and preparation The effect of simple process and low price

Active Publication Date: 2022-05-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrochemical reaction is heavily dependent on platinum due to the slower reaction kinetics
However, the limited resources and high price of platinum severely restrict its development, so it is imperative to develop high-efficiency non-platinum electrocatalysts.
A large number of studies have shown that transition metal phosphides exhibit electrocatalytic performance comparable to that of platinum, but they still face the problems of less exposed active sites and low electronic conductivity.

Method used

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  • Transition metal phosphide porous carbon nanosheet composites and their preparation and application
  • Transition metal phosphide porous carbon nanosheet composites and their preparation and application
  • Transition metal phosphide porous carbon nanosheet composites and their preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 6.8g of pentaerythritol into a flask, add 29.40g of phosphoric acid, stir to reduce pressure (vacuum degree is 0.1MPa), heat to 120°C, and keep warm for 1.5h to obtain light yellow transparent viscous pentaerythritol phosphate liquid. In another round bottom flask, add 120mL ethanol, 10mM ferric chloride and 16.38g melamine, fully stir for 1.5h, pour the pentaerythritol phosphate synthesized in the previous step into the melamine equipped with ethanol dispersant, heat to 80 ℃, stirred and refluxed for 6h, and rotary evaporated to obtain the precursor, put the precursor in a quartz boat, and in a nitrogen atmosphere, the temperature was raised to 350°C at a heating rate of 5°C / min, kept for 0.5h, and continued at a heating rate of 5°C / min Raise the temperature to 950°C, keep it for 2h, cool to room temperature and take it out. Such as figure 1 As shown by XRD, the obtained metal phosphide is FeP, and FeP is dispersed on the porous carbon nanosheet and covered by g...

Embodiment 2

[0027] Weigh 6.8g of pentaerythritol into a flask, add 29.40g of phosphoric acid, stir to reduce pressure (vacuum degree is 0.1MPa), heat to 120°C, and keep warm for 1.5h to obtain light yellow transparent viscous pentaerythritol phosphate liquid. In another round bottom flask, add 120mL ethanol, 10mM ferric chloride and 16.38g melamine, fully stir for 1.5h, pour the pentaerythritol phosphate synthesized in the previous step into the melamine equipped with ethanol dispersant, heat to 80 ℃, stirred and refluxed for 6h, and rotary evaporated to obtain the precursor, put the precursor in a quartz boat, and in a nitrogen atmosphere, the temperature was raised to 350°C at a heating rate of 5°C / min, kept for 0.5h, and continued at a heating rate of 5°C / min Raise the temperature to 950°C, keep it for 4h, cool to room temperature and take it out. Such as figure 2 As shown by XRD, the obtained metal phosphide is Fe 2 P, Fe 2 P is dispersed on porous carbon nanosheets and covered by...

Embodiment 3

[0029] Weigh 6.8g of pentaerythritol into a flask, add 29.40g of phosphoric acid, stir to reduce pressure (vacuum degree is 0.1MPa), heat to 120°C, and keep warm for 1.5h to obtain light yellow transparent viscous pentaerythritol phosphate liquid. Add 120mL ethanol, 10mM cobalt chloride hexahydrate and 16.38g melamine in another round bottom flask, stir well for 1.5h, pour the pentaerythritol phosphate synthesized in the previous step into the melamine equipped with ethanol dispersant, and heat to 80°C, stirred and refluxed for 6h, and rotary evaporated to obtain the precursor, put the precursor in a quartz boat, and in a nitrogen atmosphere, raise the temperature to 350°C at a rate of 5°C / min, keep it for 0.5h, and continue to increase the temperature at 5°C / min The temperature was raised to 950°C, kept for 2h, cooled to room temperature and taken out. Such as image 3 As shown by XRD, the obtained metal phosphide is CoP, and CoP is dispersed on the porous carbon nanosheets ...

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Abstract

A transition metal phosphide / porous carbon nano sheet composite material, transition metal phosphide (Fe x P y ,Co x P y , Ni x P y , Cu x P y , wherein it is 1:4‑2:1), the transition metal phosphide is dispersed on the porous carbon nanosheet and coated in the graphite layer, the graphite layer is 3‑20 layers, the porous carbon nanosheet contains N element, and also Contains one or more of heterogeneous elements P, S, B. The content of N element in the porous carbon nanosheet and the total mass content of one or more of the heterogeneous elements P, S and B are respectively 2%-7%. Compared with the prior art, the present invention has the following advantages: the preparation method is simple, it has universal applicability and can prepare various phosphides, and the phosphides with different ratios of x and y can be obtained through the feeding ratio and roasting conditions. The obtained composite material has high specific surface area and high electrical conductivity, and has a good application prospect in the field of electrocatalysis.

Description

technical field [0001] The invention relates to the field of carbon-based electrocatalytic materials, in particular to a transition metal phosphide / porous carbon nanosheet composite material and a preparation method thereof. Background technique [0002] With the deterioration of the environment and the intensification of the energy crisis, the hydrogen energy economy represented by proton exchange membrane fuel cells and electrolyzed water has attracted widespread attention. However, the electrochemical reaction relies heavily on platinum because of the slow reaction kinetics. However, limited and expensive platinum resources severely restrict its development, so it is imperative to develop efficient non-platinum electrocatalysts. A large number of studies have shown that transition metal phosphides exhibit electrocatalytic performance comparable to that of platinum, but they still face the problems of less exposed active sites and low electronic conductivity. Contents o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8825H01M4/9083H01M4/90Y02E60/50
Inventor 王素力戚甫来孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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