Preparation method of graphdiyne-loaded monatomic catalyst

A graphdiyne and catalyst technology, which is applied in the field of preparing single-atom catalysts, can solve problems such as inability to single-atom catalysts, unstable metal single atoms and support materials, atomic agglomeration and damage to the support structure, and achieve excellent oxygen reduction reaction and preparation speed. Fast, simple and convenient preparation process

Pending Publication Date: 2020-08-04
CHAOWEI POWER CO LTD +1
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  • Abstract
  • Description
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Problems solved by technology

[0009] In view of the above analysis, the embodiment of the present invention aims to provide a preparation method of a graphyne-supported single-atom catalyst to solve the problem that the existing metal single-atom and support materials are not stable at high temperatures, which can easily lead to atomic agglomeration and support. Structural disruption leading to the technical problem of not being able to ultimately form a stable single-atom catalyst

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  • Preparation method of graphdiyne-loaded monatomic catalyst
  • Preparation method of graphdiyne-loaded monatomic catalyst
  • Preparation method of graphdiyne-loaded monatomic catalyst

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preparation example Construction

[0041] The invention provides a preparation method of a graphyne-supported single-atom catalyst, such as figure 1 shown, including the following steps:

[0042] Step 1. Mix hexabromobenzene and calcium carbide at a molar ratio of 1:3 to 1:6, mix well and dissolve in ethanol to form an ethanol solution; wherein, the molar ratio of hexabromobenzene and ethanol is 10:1- 25:1; the volume of ethanol is 10-20ml, put the ethanol solution and a certain amount of stainless steel balls into a ball mill for grinding.

[0043] It should be noted that the ball mill was used to process at a rotational speed of 600 rpm for 40-48 hours; and during the grinding process, cooling was performed every 30 minutes for 15 minutes to avoid overheating. The purpose of grinding the ethanol solution with stainless steel balls and controlling the grinding time is to reduce the powder agglomeration, ball sticking, sticking to the wall and the wear degree of the grinding medium and the inner wall of the gr...

Embodiment 1

[0056] The present embodiment provides a kind of preparation method of graphyne supported single-atom catalyst, comprising the following steps:

[0057] Step 1. Mix hexabromobenzene and calcium carbide in 10ml ethanol at a ratio of 1:5, put it and 67g stainless steel balls into a ball mill for grinding;

[0058] Step 2. After the grinding is completed, perform centrifugal washing, dry in a vacuum oven, and then calcinate at 450° C. for 2 hours;

[0059] Step 3, preparing graphyne after acid washing the calcined product;

[0060] Step 4, configure 25mL 0.02mol / L metal precursor solution, wherein the metal precursor is PdCl 2 , the solvent is water; after mixing the prepared graphdiyne and the metal precursor solution for 24 hours, filter, wash with deionized water for 2 to 3 times, and dry in a vacuum oven at 60°C for 6 hours;

[0061] Step 5: Treat the graphyne loaded with the metal precursor with Joule heating to a high temperature of 1000K, and then cut off the current to ...

Embodiment 2

[0064] The present embodiment provides a preparation method of a graphyne-supported single-atom catalyst, comprising the following steps: Step 1, mixing hexabromobenzene and calcium carbide in 10ml ethanol at a ratio of 1:5, and putting it with 67g stainless steel balls into the ball mill for grinding;

[0065] Step 2. After the grinding is completed, perform centrifugal washing, dry in a vacuum oven, and then calcinate at 450° C. for 2 hours;

[0066] Step 3, preparing graphyne after acid washing the calcined product;

[0067] Step 4, configure 20mL 0.01mol / L metal precursor solution, wherein the metal precursor is H 3 PtCl 6 , the solvent is water; after mixing the prepared graphdiyne and the metal precursor solution for 24 hours, filter and wash with deionized water for 2 to 3 times, and dry in a vacuum oven at 60°C for 6 hours;

[0068] Step 5: Treat the graphyne loaded with the metal precursor to a high temperature with Joule heating, and then cut off the current to co...

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Abstract

The invention relates to a preparation method of a graphdiyne-loaded monatomic catalyst, which belongs to the technical field of preparation of monatomic catalysts. The technical problems of atom aggregation and carrier structure damage easily caused by instability of existing metal monatomic and carrier materials at continuous high temperature is solved. The method comprises the steps of 1 mixinghexabromobenzene and calcium carbide, dissolving in ethanol, and grinding; 2 centrifuging, washing and calcining the generated reaction product; 3 carrying out acid washing treatment on the calcinedproduct to obtain graphdiyne; 4 soaking graphdiyne in a metal precursor solution to obtain graphdiyne loaded with a metal precursor; and 5 carrying out joule heating treatment on the graphdiyne loadedwith the metal precursor to a certain temperature to obtain the graphdiyne-loaded metal monoatomic catalyst. The monoatomic catalyst prepared by the method can prevent continuous high temperature from damaging the stability of the catalyst carrier, and atom aggregation is avoided.

Description

technical field [0001] The invention relates to the technical field of preparing single-atom catalysts, in particular to a method for preparing graphyne-supported single-atom catalysts. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is one of the key technologies that play an important role in renewable energy. However, the kinetically sluggish oxygen reduction reaction (ORR) greatly limits the commercial application of fuel cells. Currently, platinum (Pt) and its alloys are the most effective ORR catalysts. However, the high cost, easy poisoning, and poor stability of Pt-based catalysts greatly limit their large-scale practical applications. Therefore, it is necessary to reduce the loading of noble metal catalysts or develop non-noble metal catalysts. [0003] Single-atom catalysts are the most ideal state for the dispersion of supported metal catalysts. They can maximize the utilization efficiency of active metal sites and improve the uniformit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M8/10
CPCH01M4/88H01M4/8882H01M4/9041H01M4/9083H01M8/10Y02E60/50
Inventor 赵宏滨徐元阙奕鹏刘孝伟方建慧徐甲强张登松张久俊
Owner CHAOWEI POWER CO LTD
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