Preparation method of N-doped porous carbon coated nano-particles of Co-Ir core-shell structure and application of N-doped porous carbon coated nano-particles of Co-Ir core-shell structure to catalytic water splitting

A technology of nitrogen-doped porous carbon and core-shell structure, which is applied in the electrolysis process, electrolysis components, transportation and packaging, etc., can solve the problems that have not yet been published in the literature or patent reports, and achieve low price, high catalytic performance, and low cost. cost effect

Inactive Publication Date: 2018-05-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention uses ZIF-67 as a template to prepare nitrogen-doped porous carbon-coated cobalt-iridium core-shell nanoparticles and apply them to catalyze water splitting. No published literature or patent reports have been seen yet.

Method used

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  • Preparation method of N-doped porous carbon coated nano-particles of Co-Ir core-shell structure and application of N-doped porous carbon coated nano-particles of Co-Ir core-shell structure to catalytic water splitting
  • Preparation method of N-doped porous carbon coated nano-particles of Co-Ir core-shell structure and application of N-doped porous carbon coated nano-particles of Co-Ir core-shell structure to catalytic water splitting
  • Preparation method of N-doped porous carbon coated nano-particles of Co-Ir core-shell structure and application of N-doped porous carbon coated nano-particles of Co-Ir core-shell structure to catalytic water splitting

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) According to the molar ratio Co 2+ : MeIM=1:4 ratio, at room temperature, 6.98g Co(NO 3 ) 2 ·6H 2 Dissolve O in 240mL of methanol to make solution A, then dissolve 7.88g of 2-methylimidazole in 80mL of methanol to make solution B; mix and stir the two solutions of A and B for 10min, let stand for 24h, then centrifuge, and wash with methanol Several times; the resulting dark blue precipitate was dried in a vacuum oven at 50° C. for 12 hours to obtain ZIF-67 nanocrystals. figure 1 The ZIF-67 nanocrystal shown in a is a polyhedral geometry with a size of 840-1100 nm.

[0037] (2) Place the ZIF-67 nanocrystal obtained above in a tube furnace, heat it to 900° C. under an Ar gas atmosphere and keep it warm for 3 hours, and cool to room temperature after the reaction. The obtained black powder is nitrogen-doped porous carbon immobilized Cobalt nanoparticles (Co-NC). figure 1 The Co-NC particles shown in b are polyhedral geometry with rough surface.

[0038] (3) Take ...

Embodiment 2

[0053] Same as in Example 1, except that the amount of iridium chloride was reduced to 4.38 mg to obtain Co@Ir / NC-5%. Resulting material properties:

[0054] The specific surface area is 135.61m 2 g -1 ;

[0055] At a current density of 10mA cm -2 , the required overpotential for the oxygen evolution reaction is 322mV;

[0056] Oxygen evolution reaction Tafel slope is 78.3mV dec -1 ;

[0057] At a current density of 10mA cm -2 , the overpotential required for the hydrogen evolution reaction is -198mV;

[0058] The Tafel slope of the hydrogen evolution reaction is 142.9mV dec -1 .

Embodiment 3

[0060] Same as in Example 1, except that the amount of iridium chloride was increased to 15.98 mg to obtain Co@Ir / NC-15%. Resulting material properties:

[0061] The specific surface area is 135.61m 2 g -1 ;

[0062] At a current density of 10mA cm -2 , the required overpotential for the oxygen evolution reaction is 302mV;

[0063] Oxygen evolution reaction Tafel slope is 76.3mV dec -1 ;

[0064] At a current density of 10mA cm -2 , the overpotential required for the hydrogen evolution reaction is -147mV;

[0065] The Tafel slope of the hydrogen evolution reaction is 133.2mV dec -1 .

[0066] The electrochemical tests of Examples 2 and 3 are the same as Example 1.

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Abstract

The invention discloses a preparation method of N-doped porous carbon coated nano-particles (Co@Ir/NC-x, and x is the quality ratio of Ir) of a Co-Ir core-shell structure and application of the N-doped porous carbon coated nano-particles of the Co-Ir core-shell structure to catalytic water splitting. The preparation method has the advantages that (1) the preparation process is simple and direct, and energy consumption is low, specifically, Co/NC obtained after a zeolite imidazole framework material (ZIF-67 for short) is calcined is directly subjected to Galvanic replacement with Ir<3+> at theroom temperature, high temperature and high pressure are not needed, and accordingly the energy consumption is low; (2) the catalytic performance is good, and the stability is high, specifically, a Co@Ir/NC-10% sample is in a 1M KOH solution, in an oxygen producing test, the current density is 10 mA cm<-2>, the overpotential is 280 mV, and the performance is higher than IrO2; in a hydrogen producing test, the current density is 10 mA cm<-2>, the overpotential is -121 mV; besides, after a stability test of 12 h, the oxygen producing activity of IrO2 is attenuated by 55.8% while the oxygen producing activity of Co@Ir/NC-10% is attenuated only by 20.6%, and the hydrogen producing stability of Co@Ir/NC-10% is far higher than that of commercial Pt/C under the same conditions; and (3) the catalyst cost is low and the Co source is wide, specifically, the nano-particles are of the core-shell structure with Co as a core and Ir as a shell, the amount of Ir is reduced on the basis of more exposedcatalytic activity sites, a core metal precursor Co is wide in source and low in cost, the catalyst cost is greatly reduced, and great commercial application prospects are achieved.

Description

technical field [0001] The cobalt-iridium core-shell nanomaterial prepared by the invention is used for electrochemical oxygen evolution and hydrogen evolution reactions to split water, and belongs to the field of new energy materials. It specifically relates to the preparation of nano-catalysts with core-shell structure and its application in catalytic water splitting. Background technique [0002] With the continuous consumption of fossil fuels and the seriousness of environmental pollution, it is essential to develop renewable and sustainable clean energy. Hydrogen is considered to be the most ideal substitute for fossil fuels because of its high energy storage density and low pollution characteristics. Electrochemical catalytic water splitting is the most promising technology for the large-scale production of hydrogen. The water splitting process involves two reactions, hydrogen evolution and oxygen evolution, but both require highly active electrocatalysts to reduce t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06B22F9/24B22F1/02
CPCB22F9/24C25B11/091B22F1/16
Inventor 唐正华吴雯李栋梁
Owner SOUTH CHINA UNIV OF TECH
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