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Preparation method of co-doped graphene gel by bonding of metal and nitrogen

A graphene gel and co-doping technology, which is applied in electrical components, battery electrodes, circuits, etc., can solve the problems that hinder the commercialization of fuel cells, the scarcity of Pt resources, and the high cost of batteries, and achieve excellent electrocatalytic performance and methanol resistance Good performance and high current density

Inactive Publication Date: 2016-08-17
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, Pt or Pt-based alloy catalysts are mainly used as cathode catalysts for fuel cells. Due to the scarcity of Pt resources and high prices, the cost of batteries is too high, which seriously hinders the commercialization of fuel cells.

Method used

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  • Preparation method of co-doped graphene gel by bonding of metal and nitrogen
  • Preparation method of co-doped graphene gel by bonding of metal and nitrogen
  • Preparation method of co-doped graphene gel by bonding of metal and nitrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Using the improved Hummers method, add 120mL of concentrated sulfuric acid and 13.3mL of concentrated phosphoric acid to a 500mL container in turn, stir, slowly heat up to 50°C in a water bath, add 1g of graphite powder, 6g of potassium permanganate, stir for 12h, and the solution Pour it onto ice cubes containing 10 mL of hydrogen peroxide solution, stir and cool to room temperature, and filter unreacted solids. Centrifugal washing to neutrality, drying to obtain graphene oxide;

[0027] (2) Weigh 0.15g of GO, add 15mL of double distilled water, sonicate for 2min, add 1mL of formaldehyde, 0.35g of melamine, 40mg of ferric nitrate, stir gently; at 120°C, hydrothermally react for 12h. The resulting solid is freeze-dried to obtain a xerogel supported by a cross-linking agent;

[0028] (3) Heat the xerogel to 300°C at a heating rate of 5°C / min in a tube furnace under an argon atmosphere, then raise the temperature to 550°C at a heating rate of 10°C / min, and keep it wa...

Embodiment 2

[0030] (1) The preparation method of graphene oxide is the same as embodiment 1.

[0031] (2) Weigh 0.015g GO, add 15mL of double distilled water, sonicate for 2min, add 1mL of formaldehyde, 0.15g of phenol, 40mg of cobalt nitrate, stir gently; at 140°C, hydrothermal reaction for 12h. The obtained solid is freeze-dried to obtain a xerogel supported by a cross-linking agent;

[0032] (3) Heat the xerogel to 300°C at a heating rate of 5°C / min in a tube furnace under an argon atmosphere, then raise the temperature to 650°C at a heating rate of 10°C / min, and keep it warm for 6 hours. Remove the product after the temperature has dropped to room temperature.

Embodiment 3

[0034] (1) The preparation method of graphene oxide is the same as embodiment 1.

[0035] (2) Weigh 0.15g GO, add 15mL double-distilled water, sonicate for 2min, add 2mL formaldehyde, 0.7g urea, 40mg nickel nitrate, stir gently; at 160°C, hydrothermal reaction for 12h. drying the obtained solid at 80°C to obtain a xerogel supported by a crosslinking agent;

[0036] (3) Heat the dry gel up to 300°C at a heating rate of 5°C / min in a tube furnace under a nitrogen atmosphere, then raise the temperature to 750°C at a heating rate of 10°C / min, and keep it warm for 6 hours, then wait for Remove the product after the temperature has dropped to room temperature.

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Abstract

The invention relates to a preparation method of co-doped graphene gel by bonding of metal and nitrogen. The preparation method comprises the following steps of carrying out joint hydrothermal crosslinking on graphene oxide, a crosslinking agent and a metal precursor, and carrying out calcination after drying. The preparation method has the advantages that the graphene gel prepared according to the method is stable in structure, the material has excellent electro-catalytic property on oxygen reduction reaction of a negative electrode of a fuel cell by a bonded doping structure, the electrode modified with the material is low in initial potential, large in current density and high in methanol resistance, and the electro-catalytic property of the material exceeds that of a commercial Pt / C catalyst.

Description

technical field [0001] The invention relates to a method for preparing graphene gel co-doped with metal and nitrogen, and belongs to the technical field of material synthesis. Background technique [0002] Graphene has excellent electrical, optical, mechanical and thermal properties, and has a wide range of applications in the field of new energy materials, such as solar cells, lithium-ion batteries, supercapacitors, fuel cells, etc. However, there are at least two major problems that need to be solved urgently in the practical use of graphene. First, pure graphene is relatively inert and needs to be modified by heteroatom doping; second, two-dimensional graphene has a high surface energy, and the sheets are easily agglomerated. The assembly of two-dimensional planar graphene into three-dimensional porous structure of three-dimensional graphene is considered to be one of the most effective methods to solve graphene agglomeration. [0003] Although the electrocatalytic perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8825H01M4/90Y02E60/50
Inventor 秦勇晁磊袁杰储富强孔泳
Owner CHANGZHOU UNIV
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