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A kind of graphene supported phosphate catalyst, its preparation method and application

A graphene and catalyst technology, applied in the field of graphene-supported phosphate catalysts, can solve the problems of affecting catalytic activity and poor conductivity

Active Publication Date: 2021-07-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current catalyst materials of this type of support are usually in the shape of agglomerated particles, which easily affects their catalytic activity, and the conductivity of this type of material is poor.

Method used

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  • A kind of graphene supported phosphate catalyst, its preparation method and application
  • A kind of graphene supported phosphate catalyst, its preparation method and application
  • A kind of graphene supported phosphate catalyst, its preparation method and application

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preparation example Construction

[0033] Correspondingly, an embodiment of the present invention provides a method for preparing the graphene-supported phosphate catalyst, comprising the following steps:

[0034] S1. Using DNA as the phosphoric acid source, subjecting the iron source, cobalt source and graphene oxide to hydrothermal treatment in water, and then freeze-drying to obtain the precursor;

[0035] S2, carbonizing the precursor at high temperature under an inert atmosphere to obtain graphene-supported Fe 2 Co(PO 4 ) 2 catalyst.

[0036] The preparation method of the present invention can form a three-dimensional networked graphene carrier, anchoring composite Fe 2 Co(PO 4 ) 2 Finally, a catalyst with a micron flower-like morphology is obtained, which has the characteristics of high electrical conductivity and high catalytic activity.

[0037] In a specific embodiment of the present invention, the preparation method includes: preparing a mixed aqueous dispersion of graphene oxide and DNA; prepar...

Embodiment 1

[0051] (1) Preparation of a mixed dispersion of graphene oxide and DNA

[0052] Graphene oxide was prepared by the Hummers method. 200 mg of graphene oxide and 50 mg of DNA were added to 40 mL of deionized water, and ultrasonically dispersed for 1 hour to obtain a uniform dispersion.

[0053] (2) Preparation of FeCl 2 4H 2 O and Co(Ac) 2 4H 2 Mixed solution of O

[0054] 0.3mmol FeCl 2 4H 2 O and 0.3mmol Co(Ac) 2 4H 2 O was added with 10 mL of deionized water and stirred for 15 min to obtain a uniform mixed solution.

[0055] (3) Preparation of precursor

[0056] FeCl 2 4H 2 O and Co(Ac) 2 4H 2 The mixed solution of O was added to the aqueous dispersion of graphene oxide and DNA, stirred evenly, hydrothermally heated at 180 °C for 18 h, and freeze-dried to obtain 50 g of the precursor.

[0057] (4) Graphene supported Fe 2 Co(PO 4 ) 2 Non-noble metal oxygen reduction catalyst

[0058] The resulting precursor was carbonized for 3 h under a nitrogen atmosphere at ...

Embodiment 2

[0063] (1) Preparation of a mixed dispersion of graphene oxide and DNA

[0064] Graphene oxide was prepared by the Hummers method. 200 mg of graphene oxide and 50 mg of DNA were added to 40 mL of deionized water, and ultrasonically dispersed for 1 hour to obtain a uniform dispersion.

[0065] (2) Preparation of FeCl 2 4H 2 O and Co(Ac) 2 4H 2 Mixed solution of O

[0066] 0.4mmol FeCl 2 4H 2 O and 0.4mmol Co(Ac) 2 4H 2 O was added with 10 mL of deionized water and stirred for 15 min to obtain a uniform mixed solution.

[0067] (3) Preparation of precursor

[0068] FeCl 2 4H 2 O and Co(Ac) 2 4H 2 The mixed solution of O was added to the aqueous dispersion of graphene oxide and DNA, stirred evenly, hydrothermally heated at 180 °C for 18 h, and freeze-dried to obtain 50 g of the precursor.

[0069] (4) Graphene supported Fe 2 Co(PO 4 ) 2 Non-noble metal oxygen reduction catalyst

[0070] The resulting precursor was carbonized for 3 h under a nitrogen atmosphere a...

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Abstract

The invention provides a graphene-supported phosphate catalyst, its preparation method and application, the catalyst comprising: a graphene carrier and Fe compounded on the graphene carrier 2 Co(PO 4 ) 2 ; The graphene-supported phosphate catalyst has the appearance of a micron particle aggregate, and the graphene carrier presents a three-dimensional network. In this catalyst, the isolated active site Fe 2 Co(PO 4 ) 2 It has high catalytic activity; the three-dimensional network graphene framework has high conductivity and large specific surface area, which is conducive to mass transfer during the catalytic process, thereby further improving the catalytic performance. The method for preparing the catalyst of the present invention adopts DNA, iron source, cobalt source and graphene oxide to obtain a precursor through hydrothermal treatment and freeze-drying; and then conducts high-temperature carbonization to obtain the graphene-loaded phosphate catalyst. The invention has simple preparation and less environmental pollution, and can solve the problems of high price and scarce resources of the platinum-based oxidant catalyst.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a graphene-supported phosphate catalyst, its preparation method and application. Background technique [0002] With the gradual reduction of mineral resources and the increasingly serious environmental pollution, the development of new clean energy is crucial. In the field of energy conversion and storage, metal-air batteries have received extensive attention due to their high theoretical energy density. Metal-air batteries generally use metals with negative electrode potentials such as magnesium, aluminum, zinc, iron, etc. as the negative electrode, and oxygen in the air or pure oxygen as the active material of the positive electrode. However, the inert oxygen reduction reaction at the cathode limits the large-scale application of metal-air batteries. Therefore, there is a need to develop efficient oxygen reduction catalysts. [0003] Noble metal catalysts such as platinum ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/88H01M12/06
CPCH01M4/8825H01M4/9016H01M4/9083H01M12/06H01M2004/8689
Inventor 秦易曹瑞国
Owner UNIV OF SCI & TECH OF CHINA
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