Load-type monoatomic catalyst and preparation method thereof

Abstract

The invention provides a load-type monoatomic catalyst. The catalyst is formed by uniformly loading monodispersed metal atoms on the surface of a nano substrate material. A preparation method thereofcomprises the following steps: in an electrolyte solution containing metal salt, performing electrochemical deposition by using a three-electrode system, using a glassy carbon electrode loaded with the nano substrate material as a working electrode, using a graphite rod as a counter electrode, using a silver / silver chloride electrode as a reference electrode, performing linear volt-ampere scanning, enabling the metal atoms to be monodispersely and uniformly deposited on the nano substrate material, to obtain the load-type monoatomic catalyst. The load-type monoatomic catalyst is capable of, based on electro-deposition, constructing a monoatomic structure, through an electro-deposition method, rapidly, efficiently, and controllably depositing single atoms, and realizing deposition of positive and negative electrodes, and the obtained load-type monoatomic catalyst has important significance to a general application in the catalytic and particle physical field.

Description

technical field

[0001] The invention relates to the technical field of supported single-atom catalysts, in particular to a supported single-atom catalyst and a preparation method thereof. Background technique

[0002] The emerging single-atom structure is obtained by depositing individual metal atoms on the substrate material independently. A series of characteristics such as synergy, especially in the field of catalysis. At present, single-atom catalysts have shown excellent activity, selectivity and stability in a series of reactions, such as water-gas shift, hydrogenation, water electrolysis, oxygen reduction, etc., and the metal loading can be effectively reduced by designing single-atom catalysts , improve atomic utilization and save costs. In addition, the single-atom structure in single-atom catalysts also provides a platform for particle physics research on atomic models. However, the current methods for synthesizing single-atom catalysts generally have problems s...

Examples

Embodiment 1

[0026] A method for preparing a supported single-atom catalyst, wherein the catalyst is composed of monodisperse iridium atoms uniformly supported on the surface of two-dimensional cobalt hydroxide nanosheets, the preparation method comprising:

[0027] Cobalt hydroxide two-dimensional nanoflakes are made into a uniform ink with a concentration of 4 mg / mL, and 5 μL of the uniform ink is evenly loaded onto a glassy carbon electrode with a diameter of 3 mm. The electrode is used as the working electrode in the three-electrode system, the graphite rod is used as the counter electrode, and the silver / silver chloride electrode is used as the reference electrode; Stir evenly in the iridium chloride aqueous solution to obtain an electrolyte solution containing iridium tetrachloride, and the concentration of iridium is 0.1mmol / L, using CHI 660E electrochemical workstation of Shanghai Chenhua Company, at a scanning speed of 5mV / s, and the cathode deposition The scanning potential (rela...

Embodiment 2

[0030] A preparation method of a supported single-atom catalyst, the catalyst is composed of monodisperse ruthenium atoms uniformly supported on the surface of two-dimensional cobalt hydroxide nanosheets, the preparation method comprising:

[0031] Cobalt hydroxide two-dimensional nanoflakes are made into a uniform ink with a concentration of 4 mg / mL, and 5 μL of the uniform ink is evenly loaded onto a glassy carbon electrode with a diameter of 3 mm. The electrode is used as the working electrode in the three-electrode system, the graphite rod is used as the counter electrode, and the silver / silver chloride electrode is used as the reference electrode; Stir evenly in the ruthenium chloride aqueous solution to obtain an electrolyte solution containing ruthenium trichloride, and the concentration of ruthenium is 0.2mmol / L, using CHI 660E electrochemical workstation of Shanghai Chenhua Company, the scanning speed is 4.8mV / s, and the cathode The deposition scan potential (relative...

Embodiment 3

[0034] A preparation method of a supported single-atom catalyst, the catalyst is composed of monodisperse rhodium atoms uniformly supported on the surface of two-dimensional cobalt hydroxide nanosheets, the preparation method comprising:

[0035] Cobalt hydroxide two-dimensional nanoflakes are made into a uniform ink with a concentration of 4 mg / mL, and 5 μL of the uniform ink is evenly loaded onto a glassy carbon electrode with a diameter of 3 mm. The electrode is used as the working electrode in the three-electrode system, the graphite rod is used as the counter electrode, and the silver / silver chloride electrode is used as the reference electrode; Stir well in the sodium hexachlororhodate aqueous solution, obtain the electrolytic solution that comprises sodium hexachlororhodiumate, and the concentration of rhodium is 0.4mmol / L, use CHI660E electrochemical workstation of Shanghai Chenhua Company, at scanning speed be 5.2mV / s, And the cathodic deposition scanning potential (r...

technical field

[0001] The invention relates to the technical field of supported single-atom catalysts, in particular to a supported single-atom catalyst and a preparation method thereof. Background technique

[0002] The emerging single-atom structure is obtained by depositing individual metal atoms on the substrate material independently. A series of characteristics such as synergy, especially in the field of catalysis. At present, single-atom catalysts have shown excellent activity, selectivity and stability in a series of reactions, such as water-gas shift, hydrogenation, water electrolysis, oxygen reduction, etc., and the metal loading can be effectively reduced by designing single-atom catalysts , improve atomic utilization and save costs. In addition, the single-atom structure in single-atom catalysts also provides a platform for particle physics research on atomic models. However, the current methods for synthesizing single-atom catalysts generally have problems s...

Examples

Embodiment 1

[0026] A method for preparing a supported single-atom catalyst, wherein the catalyst is composed of monodisperse iridium atoms uniformly supported on the surface of two-dimensional cobalt hydroxide nanosheets, the preparation method comprising:

[0027] Cobalt hydroxide two-dimensional nanoflakes are made into a uniform ink with a concentration of 4 mg / mL, and 5 μL of the uniform ink is evenly loaded onto a glassy carbon electrode with a diameter of 3 mm. The electrode is used as the working electrode in the three-electrode system, the graphite rod is used as the counter electrode, and the silver / silver chloride electrode is used as the reference electrode; Stir evenly in the iridium chloride aqueous solution to obtain an electrolyte solution containing iridium tetrachloride, and the concentration of iridium is 0.1mmol / L, using CHI 660E electrochemical workstation of Shanghai Chenhua Company, at a scanning speed of 5mV / s, and the cathode deposition The scanning potential (rela...

Embodiment 2

[0030] A preparation method of a supported single-atom catalyst, the catalyst is composed of monodisperse ruthenium atoms uniformly supported on the surface of two-dimensional cobalt hydroxide nanosheets, the preparation method comprising:

[0031] Cobalt hydroxide two-dimensional nanoflakes are made into a uniform ink with a concentration of 4 mg / mL, and 5 μL of the uniform ink is evenly loaded onto a glassy carbon electrode with a diameter of 3 mm. The electrode is used as the working electrode in the three-electrode system, the graphite rod is used as the counter electrode, and the silver / silver chloride electrode is used as the reference electrode; Stir evenly in the ruthenium chloride aqueous solution to obtain an electrolyte solution containing ruthenium trichloride, and the concentration of ruthenium is 0.2mmol / L, using CHI 660E electrochemical workstation of Shanghai Chenhua Company, the scanning speed is 4.8mV / s, and the cathode The deposition scan potential (relative...

Embodiment 3

[0034] A preparation method of a supported single-atom catalyst, the catalyst is composed of monodisperse rhodium atoms uniformly supported on the surface of two-dimensional cobalt hydroxide nanosheets, the preparation method comprising:

[0035] Cobalt hydroxide two-dimensional nanoflakes are made into a uniform ink with a concentration of 4 mg / mL, and 5 μL of the uniform ink is evenly loaded onto a glassy carbon electrode with a diameter of 3 mm. The electrode is used as the working electrode in the three-electrode system, the graphite rod is used as the counter electrode, and the silver / silver chloride electrode is used as the reference electrode; Stir well in the sodium hexachlororhodate aqueous solution, obtain the electrolytic solution that comprises sodium hexachlororhodiumate, and the concentration of rhodium is 0.4mmol / L, use CHI660E electrochemical workstation of Shanghai Chenhua Company, at scanning speed be 5.2mV / s, And the cathodic deposition scanning potential (r...

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