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Preparation method for nano-cobalt/graphene core-shell structured electrocatalyst

A technology of core-shell structure and electrocatalyst, which is applied in the direction of nanotechnology, nanotechnology, structural parts, etc., can solve the problems of high cost of noble metal catalysts, complicated preparation process, and many influencing factors, so as to increase the number of catalytic active sites and improve the preparation process. Simple, precise ingredient control for results

Active Publication Date: 2017-03-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention solves the problems of high cost, poor stability and low service life of existing fuel cell noble metal catalysts, and the problems of complex preparation process, many influencing factors and poor repeatability, and provides a nano-cobalt / graphene core-shell structure electrocatalyst Preparation

Method used

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  • Preparation method for nano-cobalt/graphene core-shell structured electrocatalyst
  • Preparation method for nano-cobalt/graphene core-shell structured electrocatalyst

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specific Embodiment approach 1

[0023] Specific embodiment one: the preparation method of a kind of nano-cobalt / graphene core-shell structure electrocatalyst described in this embodiment is carried out according to the following steps:

[0024] 1. Ultrasonically clean the foamed nickel with concentrated hydrochloric acid with a weight percentage of 36% to 38% for 1min to 5min to obtain the foamed nickel with the NiO layer removed from the surface, and then ultrasonically clean the foamed nickel with absolute ethanol for 1min to 5min , and finally cleaned with deionized water to obtain a foamed nickel substrate;

[0025] 2. Add cobalt nitrate hexahydrate, ammonium fluoride and urea into deionized water to obtain a deep red clear solution;

[0026] The mass ratio of described cobalt nitrate hexahydrate and ammonium fluoride is 1:(0.2~5); the mass ratio of described cobalt nitrate hexahydrate and urea is 1:(0.2~5); The volume ratio of cobalt mass to deionized water is 1g:(20~100)mL;

[0027] 3. Put the foamed...

specific Embodiment approach 2

[0036] Specific embodiment two: this embodiment is different from specific embodiment one: the mass ratio of cobalt nitrate hexahydrate described in step 2 and ammonium fluoride is 1:0.46; Cobalt nitrate hexahydrate described in step 2 and The mass ratio of urea is 1:0.92; the volume ratio of the mass of cobalt nitrate hexahydrate described in step 2 to deionized water is 1g:55.17mL. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0037] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step three, the polytetrafluoroethylene reactor is then placed in a heating furnace to be heated to a temperature of 180°C, and the temperature is 180°C Under certain conditions, keep warm for 6h ~ 12h. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method for a nano-cobalt / graphene core-shell structured electrocatalyst, relates to the preparation method for the electrocatalyst, and aims to solve the problems of high cost, poor stability, short service life, complex preparation process, more influence factors and poor repeatability of the existing fuel cell noble metal catalyst. The preparation method comprises the steps of 1, preparing a foamed nickel substrate; 2, preparing a deep red clear solution; 3, preparing a foamed nickel substrate after reaction; 4, preparing a sheet-shaped cobalt oxide precursor; 5, putting the sheet-shaped cobalt oxide precursor into a plasma-enhanced chemical vapor deposition vacuum apparatus, and heating at certain intensity of pressure in hydrogen and argon atmosphere; and 6, pumping a carbon source gas, and performing depositing at certain radio frequency power, intensity of pressure and temperature to obtain the nano-cobalt / graphene core-shell structured electrocatalyst. The invention discloses the preparation method for the nano-cobalt / graphene core-shell structured electrocatalyst.

Description

technical field [0001] The invention relates to a preparation method of an electrocatalyst. Background technique [0002] With the increasingly prominent problems of environmental pollution and energy shortage, it is imminent to develop clean, efficient, recyclable and renewable new energy sources. Fuel cells are currently one of the hot green energy sources that are highly sought after. A fuel cell is a device that uses a redox reaction at the cathode and anode to convert the generated chemical energy into electrical energy. As one of the key materials in the development of fuel cells, electrocatalysts will directly affect the performance, stability, service life and cost of use of fuel cells. At present, the main components of fuel cell catalysts are noble metal platinum (Pt) and Pt / C composite materials, but the two major problems of high cost and low life of Pt limit the large-scale promotion of fuel cells to a certain extent. At present, cobalt (Co) and its derivative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y30/00
CPCB82Y30/00H01M4/9041H01M4/9083Y02E60/50
Inventor 亓钧雷蔡逸飞刘瑜琳贾赫男费维栋冯吉才
Owner HARBIN INST OF TECH
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