Preparation method of two-dimensional carbon nanosheet array loaded metal monatomic

A carbon nanosheet, metal-loaded technology, applied in chemical instruments and methods, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of poor stability and low atom utilization, and achieve Improve stability, solve the effect of low catalytic activity and active site utilization, and promote rapid transfer

Pending Publication Date: 2021-06-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, solving the problems of poor stability and low atom utilization by constructing single-atom catalysts with an integrated structure has become a research hotspot for researchers from all over the world.

Method used

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  • Preparation method of two-dimensional carbon nanosheet array loaded metal monatomic
  • Preparation method of two-dimensional carbon nanosheet array loaded metal monatomic
  • Preparation method of two-dimensional carbon nanosheet array loaded metal monatomic

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Two-dimensional carbon nanosheet arrays loaded with Co single atoms:

[0026] Using carbon cloth as a carrier, soak the carbon cloth in 0.5M potassium permanganate solution for 30 minutes. Preparation of reaction solution: A solution is 0.4M 2-methylimidazole aqueous solution, B solution is 0.05M zinc nitrate and cobalt nitrate aqueous solution (zinc-cobalt ratio is 4 / 1); mix A and B in a volume ratio of 1:1 liquid. The treated carbon cloth was immersed in the reaction solution and left to stand for 2 hours, then taken out and dried to obtain the ZnCo-MOF array precursor material. The prepared ZnCo-MOF array precursor material was fired in an atmosphere furnace with a nitrogen atmosphere, the firing temperature was 800 degrees Celsius, the heating rate was 2 degrees Celsius / min, and the firing time was 2 hours. The calcined material is taken out to support Co single atoms for the two-dimensional carbon nanosheet array.

[0027] Morphological characterization of ZnCo-...

Embodiment 2

[0031] Two-dimensional carbon nanosheet arrays loaded with Co single atoms:

[0032] Using carbon cloth as a carrier, soak the carbon cloth in 0.5M potassium permanganate for 30 minutes. Preparation of reaction solution: liquid A is 0.4M 2-methylimidazole aqueous solution, liquid B is 0.05M cobalt nitrate aqueous solution; mix liquid A and liquid B at a volume ratio of 1:1. The treated carbon cloth was immersed in the reaction solution and left to stand for 1 hour, then taken out and dried to obtain the Co-MOF array precursor material. The prepared Co-MOF array precursor material was calcined in an atmosphere furnace with nitrogen atmosphere, the calcining temperature was 900°C, the heating rate was 5°C / min, and the calcining time was 1 hour. The calcined material was taken out and etched in 2M hydrochloric acid for 24 hours to obtain a two-dimensional carbon nanosheet array supporting Co single atoms.

[0033] Morphological characterization of Co single-atom materials suppo...

Embodiment 3

[0035] Two-dimensional carbon nanosheet arrays loaded with Fe single atoms:

[0036] Using carbon cloth as a carrier, soak the carbon cloth in 0.5M potassium permanganate for 30 minutes. Preparation of reaction solution: A solution is 0.4M 2-methylimidazole aqueous solution, B solution is 0.05M zinc nitrate and ferric nitrate aqueous solution (the ratio of zinc to iron is 10 / 1); mix A and B at a volume ratio of 1:1 liquid. The treated carbon cloth was immersed in the reaction solution and left to stand for 2 hours, then taken out and dried to obtain the ZnFe-MOF array precursor material. The prepared ZnFe-MOF array precursor material was calcined in an atmosphere furnace with nitrogen atmosphere, the calcining temperature was 800 degrees Celsius, the heating rate was 2 degrees Celsius / min, and the calcining time was 2 hours. The calcined material is taken out to support Fe single atoms for the two-dimensional carbon nanosheet array.

[0037]Morphological characterization of...

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Abstract

The invention discloses a preparation method of a two-dimensional carbon nanosheet array loaded metal single atom. The method comprises the following steps: soaking a pretreated carrier in a reaction solution, taking out the soaked carrier and conducting airing to obtain an MOF array precursor material; and then roasting the MOF array precursor material, and after roasting is completed, obtaining the two-dimensional carbon nanosheet array loaded metal monatomic through or without etching. According to the invention, by utilizing a confinement conversion strategy of MOF, effective preparation of metal monatomic on the surface of the integrated array carrier is realized for the first time, and the problems of low catalytic activity and active site utilization rate and poor stability of a monatomic catalyst are solved. The specific surface area of the material can be greatly increased by using the two-dimensional carbon nanosheets, and exposure and utilization of single atoms are facilitated. In addition, the array structure can promote rapid transmission of electrons between the active sites and the current collector, meanwhile, the use of a binder can be avoided, and the stability of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of preparing metal single atoms, and in particular relates to a preparation method of a two-dimensional carbon nanosheet array supporting metal single atoms. Background technique [0002] With the rapid development of human society and economy, the continuous consumption of energy and the continuous deterioration of the environment have become key issues we have to face. The development of renewable clean energy conversion technologies such as fuel cells, metal-air cells and electrolysis of water technology has become a research hotspot. At the heart of these clean energy conversion technologies is a series of electrochemical reactions at the two poles. Therefore, the rational design of electrocatalytic materials with excellent activity and stability is the key to accelerate the bipolar reaction and promote the development of clean energy conversion technology. At present, the commonly used electrocatalyti...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J23/75B01J23/755B01J23/80B01J35/00B01J37/02B01J37/08
CPCB01J23/75B01J23/745B01J23/755B01J37/086B01J37/0207B01J23/80B01J35/391B01J35/33
Inventor 邵明飞谢文富卫敏
Owner BEIJING UNIV OF CHEM TECH
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