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Electrochemical preparation of carbon-supported single-atom metal catalysts

A metal catalyst and electrochemical technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., to achieve the effect of simple batch preparation

Active Publication Date: 2020-06-23
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The disadvantages of the above methods are: the methods disclosed by CN 201810436334.1 and CN 201811049499.X must adopt high-temperature heating conditions; the methods disclosed by CN 201811443713.X must be carried out in anhydrous organic solution; CN201811203761.1, CN 201810795400.4 and CN 201811049499 The method disclosed in .X directly electrochemically deposits metal ions on the nano-substrate material in a solution containing target metal ions, but in principle, this direct electrochemical deposition method cannot avoid the diffusion of target metal ions in the solution. The resulting metal atom agglomeration phenomenon, thus, the resulting catalyst usually contains a high proportion of metal clusters

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  • Electrochemical preparation of carbon-supported single-atom metal catalysts
  • Electrochemical preparation of carbon-supported single-atom metal catalysts
  • Electrochemical preparation of carbon-supported single-atom metal catalysts

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Experimental program
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Embodiment 1

[0039] figure 1 It is a scanning electron microscope (SEM) image of the glassy carbon supported monoatom metal platinum catalyst prepared by the present invention.

[0040] Preparation conditions: glassy carbon material is used as the working electrode, saturated calomel is used as the reference electrode, graphite is used as the counter electrode, and cyclic voltammetry is used. Between the highest potential +2.0V and the lowest potential -0.5V, 100mV / The speed of s cyclically scans 10 times. Subsequently, the glassy carbon electrode subjected to the above electrochemical treatment was immersed in an aqueous solution of potassium hexaplatinate (5 mM) for 10 minutes, and the solution was stirred with a magnet. The glassy carbon electrode adsorbed with platinum ions was placed in a pH 4.50 sodium acetate and acetic acid buffer solution, saturated calomel was used as the reference electrode, graphite was used as the counter electrode, and the constant potential was electrochemical...

Embodiment 2

[0043] Figure 4 It is the electrochemical linear scanning reduction and hydrogen evolution polarization curve diagram of the glassy carbon-supported single-atom metal ruthenium catalyst prepared by the present invention in sodium acetate and acetic acid buffer solution (pH=4.50).

[0044] Preparation conditions: glassy carbon material is used as the working electrode, saturated calomel is used as the reference electrode, graphite is used as the counter electrode, and cyclic voltammetry is used. Between the highest potential +2.0V and the lowest potential -0.3V, at 20mV / The speed of s cyclically scans 15 times. Subsequently, the glassy carbon electrode subjected to the above electrochemical treatment was immersed in an aqueous solution of ruthenium trichloride (5 mM) for 15 minutes, and the solution was stirred with a magnet. Put the glassy carbon electrode adsorbed with ruthenium ions into sodium acetate and acetic acid buffer solution with pH 4.50, use saturated calomel as the...

Embodiment 3

[0047] Figure 5 The hydrogen evolution polarization curve diagram of the glassy carbon-supported monoatomic metal nickel catalyst prepared by the invention in a sulfuric acid (0.5M) solution.

[0048] Preparation conditions: glassy carbon material as the working electrode, saturated calomel as the reference electrode, graphite as the counter electrode, cyclic voltammetry technology, between the highest potential +1.8V and the lowest potential 0V, with 50mV / s The speed cycle scans 15 times. Subsequently, the glassy carbon electrode subjected to the above electrochemical treatment was immersed in an aqueous solution of nickel chloride (5 mM) for 20 minutes, and the solution was stirred with a magnet. The glassy carbon electrode adsorbed with ruthenium ions was put into a sodium acetate and acetic acid buffer solution with a pH of 4.50, saturated calomel was used as a reference electrode, graphite was used as a counter electrode, and electrochemical reduction was performed at a co...

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Abstract

The invention discloses an electrochemical preparation method for a carbon-supported single-atom metal catalyst, which includes the following three steps: using electrochemical cyclic voltammetry to alternately oxidize and reduce carbon material electrodes in a working fluid; and immersing the carbon electrodes containing metal Remove the ions from the solution and wash them; electrochemically reduce the metal ions adsorbed on the carbon electrode in another electrolyte. This method can prepare carbon-supported single-atom metal catalysts with excellent performance under mild conditions.

Description

Technical field [0001] The invention relates to a preparation technology of a carbon-supported single-atom metal catalyst, in particular to a method for quickly preparing electrocatalysts in batches under normal temperature water-based solution conditions. Background technique [0002] The single-atom metal catalyst formed by dispersing the metal in the form of single atoms on the surface of the solid support not only has the characteristics of heterogeneous catalysis, but also has the characteristics of homogeneous catalysis. Compared with traditional nanoparticle metal catalysts, single-atom metal catalysts have more excellent catalytic performance (Adv.Energy Mater.8(2018)1701343), such as: all metal atoms in the catalyst can participate in the catalytic reaction, and the reaction molecule It has a faster response transition frequency (TOF) on monoatomic metals than on nano-metal particles. Therefore, the use of various single-atom metal catalysts is the main development dire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J23/46B01J23/755
CPCB01J23/42B01J23/462B01J23/755B01J35/394B01J35/33
Inventor 时康张亮亮冯康康徐杨正
Owner XIAMEN UNIV