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High-entropy monatomic catalyst and preparation method thereof

A catalyst and atomic technology, applied in the field of high-entropy single-atom catalysts and their preparation, can solve the problems of various metal elements and achieve excellent oxygen reduction catalytic activity, simple preparation process, and good stability

Pending Publication Date: 2022-05-27
HAINAN UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, single-atom catalysts can realize the controllable preparation of single-atom catalysts with two metal elements at most. There are no reports on multi-component catalysts with more than two elements. The main reason is that different metal elements have large differences in intrinsic properties. differences, so that it is very difficult to load multiple metal elements on the same carrier in the form of single atoms

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  • High-entropy monatomic catalyst and preparation method thereof
  • High-entropy monatomic catalyst and preparation method thereof
  • High-entropy monatomic catalyst and preparation method thereof

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[0028] Embodiments of the present invention provides a high-entropy single-atom catalyst preparation method in the second aspect, the preparation method comprising: the preparation of the mixed metal precursor: the carbon template precursor and a variety of metal precursors dissolved in an acidic solution to give a first mixed solution; the first mixed solution is distilled dry by means of reduced pressure distillation and then roasted in a muffle furnace to obtain a mixed metal precursor; preparation of a high-entropy single-atom catalyst: the mixed metal precursor and carbon-coated precursor are dissolved in a buffer solution to give a second mixed solution The second mixed solution was filtered and dried and then roasted in a tubular furnace to give a high entropy single-atom catalyst.

[0029] In the metal precursor of the present embodiment, different metal components are anchored in the form of single atoms in the carbon template precursor to form a mixed metal precursor. Th...

Embodiment 1

[0045] High-entropy single-atom catalysts include iron, cobalt, nickel, copper, manganese metal components and graphene-like carbon materials; wherein, iron, cobalt, nickel, copper, manganese metal components are uniformly loaded in the form of single atoms in graphene-like carbon materials.

[0046] The preparation method of high entropy single atom catalyst is as follows:

[0047] Preparation of mixed metal precursors: 30ml of pure hydrochloric acid and 120ml of deionized water were mixed to give an aqueous hydrochloric acid solution; 9g melamine, 0.1g of ferric chloride, 0.1g of cobalt chloride, 0.1g of nickel chloride, 0.14g of copper chloride, And 0.12g of manganese chloride was added to the aqueous hydrochloric acid solution for full dissolution to obtain the first mixed solution; the first mixed solution was distilled under reduced pressure at 110 ° C, and after being distilled dry to obtain melamine of the supporting metal; the melamine of the supporting metal was placed i...

Embodiment 2

[0056] High-entropy single-atom catalysts include iron, cobalt, nickel, copper, manganese, chromium metal components, as well as graphene-like carbon materials; wherein, iron, cobalt, nickel, copper, manganese, chromium metal components are uniformly loaded in the form of single atoms in graphene-like carbon materials.

[0057] The preparation method of high entropy single atom catalyst is as follows:

[0058] Preparation of mixed metal precursors: 30ml of pure hydrochloric acid and 120ml of deionized water were mixed to give an aqueous hydrochloric acid solution; 9g melamine, 0.08g of ferric chloride, 0.08g of cobalt chloride, 0.08g of nickel chloride, 0.12g of copper chloride, 0.096g of manganese chloride, And 0.07g of chromium chloride was added to the aqueous hydrochloric acid solution for sufficient dissolution to give the first mixed solution; the first mixed solution was distilled under reduced pressure at 110 ° C, distilled to obtain melamine of the supporting metal; the m...

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Abstract

The invention discloses a high-entropy monatomic catalyst and a preparation method thereof. A specific embodiment of the preparation method of the high-entropy monatomic catalyst comprises the following steps: preparation of a mixed metal precursor: dissolving a carbon template precursor and a plurality of metal precursors in an acid solution to obtain a first mixed solution; the first mixed solution is evaporated to dryness in a reduced pressure distillation mode and then roasted in a muffle furnace, and a mixed metal precursor is obtained; preparation of a high-entropy monatomic catalyst: dissolving a mixed metal precursor and a carbon-coated precursor in a buffer solution to obtain a second mixed solution; and carrying out suction filtration on the second mixed solution, drying, and roasting in a tubular furnace to obtain the high-entropy monatomic catalyst. Therefore, five or more metal components can be uniformly loaded in the graphene-like carbon material in a monatomic form to form the high-entropy monatomic catalyst, so that the oxygen reduction catalytic activity of the high-entropy monatomic catalyst is improved.

Description

Technical field [0001] The present invention belongs to the field of material preparation technology, in particular to a high entropy single-atom catalyst and a preparation method thereof. Background [0002] Because of the advantages of high atomic utilization, uniform and controllable metal activity sites, and unique metal-support interactions, single-atom catalyst materials exhibit significantly superior performance over traditional catalysts. [0003] In 2011, Academician Zhang Tao's team first reported on single-atom catalysts, and since then, single-atom catalysts have set off a research storm that has swept the world in the fields of electrocatalysis, organic synthesis, biological diagnosis and treatment, and biomass conversion. However, at present, single-atom catalysts can achieve the controllable preparation of single-atom catalysts of two metal elements at most, and it has not been reported for multi-catalysts of more than two yuan, the main reason is that there are la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/89B01J37/08
CPCB01J23/8892B01J23/8926B01J37/084B01J35/33Y02E60/50
Inventor 田新龙饶鹏邓培林沈义俊
Owner HAINAN UNIVERSITY
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