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Preparation method of Pt-Co/C-single-layer graphene for fuel cell

A single-layer graphene, fuel cell technology, applied in graphene, battery electrodes, circuits, etc., can solve the problems of expensive metal Pt, scarce resources, hindering the industrial production of fuel cells, etc., achieve excellent physical properties, and improve the degree of exfoliation. , the effect of excellent oxygen reduction electrocatalytic performance

Active Publication Date: 2015-04-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the high price and scarcity of precious metal Pt, the industrial production of fuel cells has been hindered.

Method used

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  • Preparation method of Pt-Co/C-single-layer graphene for fuel cell
  • Preparation method of Pt-Co/C-single-layer graphene for fuel cell
  • Preparation method of Pt-Co/C-single-layer graphene for fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Using natural flake graphite as raw material, oxidize it by Hummers method to obtain graphite oxide, the specific steps are as follows:

[0020] Add 2.5g each of potassium persulfate and phosphorus pentoxide into a 25mL concentrated sulfuric acid flask, stir and reflux in an oil bath at 40-180°C until it dissolves, then slowly add 1.0-5g of graphite powder, stir and heat for 2-10h. Natural flake graphite is pretreated, filtered and washed to neutral to obtain treated graphite; put the treated graphite into 50-200g concentrated sulfuric acid and stir evenly in an ice bath, slowly add 8-30gKMnO 4Then stir in an ice bath for 1-10 hours; transfer to an oil bath at 35±3°C, stir for 20-120 minutes, then slowly add 100-300mL of distilled water to the above mixture dropwise; when the mixture cools to room temperature, take it out and put it in In a 2-5L large beaker, add 500-1500mL distilled water and 5-60mLH 2 o 2 , continue to stir until no bubbles are produced, and the...

Embodiment 2

[0025] The difference between this example and Example 1 is that the mass ratio of GO to XC-72 is controlled to be 2:1 and 1:1, respectively to obtain Pt 1 -Co 1 / rGO 2 -XC-72 1 and Pt 1 -Co 1 / rGO 1 -XC-72 1 catalyst.

Embodiment 3

[0027] In order to compare the effect of the addition of activated carbon XC-72 on the performance of the catalyst, a set of comparative experiments was specially done. Catalysts supported solely by graphene were prepared under the same reaction conditions.

[0028] (1) The preparation of graphite oxide refers to step (1) of Example 1;

[0029] (2) Weigh 60 mg of graphite oxide powder, add it into a mixed solution of 60 mL of ethylene glycol and 10 mL of isopropanol, and disperse it in an ice bath with ultrasound for 35 minutes to form a uniform suspension of graphene oxide in ethylene glycol.

[0030] (3) Refer to step (4) of Example 1 to obtain Pt by microwave-assisted ethylene glycol method 1 -Co 1 / rGO catalyst.

[0031] The obtained dry catalyst was ground into powder and characterized by XRD. figure 1 Activated carbon with different mass ratios (1:1(a), 2:1(b), 4:1(c) and 1:0(d)) when the atomic mass ratio of Pt to Co is 1:1 Catalyst Pt obtained from XC-72 and graph...

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Abstract

The invention discloses a preparation method of Pt-Co / C-single-layer graphene for a fuel cell, belongs to the chemical synthesis field, and relates to a preparation method of graphene. The Pt-Co / C-single-layer graphene for the fuel cell is prepared by the following steps: (1), preparation of graphite oxide; (2), pre-treatment of active carbon XC-72; and (3), preparation of an rGO-XC-72 composite carrier-loaded Pt-Co alloy nano particle. The metal alloy nano particle-graphene and XC-72 active carbon composite catalyst prepared by utilizing a microwave ethylene glycol auxiliary reduction method is simple and easy to implement, and is high in efficiency. Moreover, the obtained graphene has a single-layer structure and the alloy particle has uniform particle diameter distribution and an average particle diameter of 1.5 nm. The catalytic activity of the nano particle can be improved by interaction with the XC-72 active carbon as well as electronic modification to the metal nano particle. And obtained catalyst has excellent oxygen-reduction electro-catalysis performances.

Description

technical field [0001] The invention belongs to the field of chemical synthesis and relates to a preparation method of graphene. Background technique [0002] Graphene is a new type of material with a two-dimensional structure derived from graphite materials with a single-layer or multi-layer carbon atomic structure, which consists of carbon atomic structures arranged in a regular hexagonal structure. Graphene is a special material in the 21st century, and the thickness of single-layer graphene is only 0.335nm, which is the thinnest material found in the world. Compared with other carbon-based supports, single-layer graphene with a perfect structure has a larger theoretical specific surface area (about 2630m 2 g -1 ) and better electron conductivity (about 2×105cm 2 V -1 the s -1 ), can be widely used in electronics, chemistry, machinery and other fields. Recent research advances have shown that graphene-based materials have a profound impact on electronic and optoelec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92H01M4/88C01B31/04C01B32/184
CPCY02E60/50
Inventor 周育红刘臣娟
Owner HARBIN INST OF TECH
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