ZIF-67 template method for preparing cobalt-platinum core-shell particle/porous carbon composite material and catalytic application of composite material in cathode of fuel cell

A ZIF-67, 1.ZIF-67 technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems that have not yet been published in literature or patent reports, and achieve controllable morphology and simple synthesis methods , The effect of stable catalytic performance

Inactive Publication Date: 2017-01-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention has not yet seen published literature or patent reports

Method used

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  • ZIF-67 template method for preparing cobalt-platinum core-shell particle/porous carbon composite material and catalytic application of composite material in cathode of fuel cell
  • ZIF-67 template method for preparing cobalt-platinum core-shell particle/porous carbon composite material and catalytic application of composite material in cathode of fuel cell
  • ZIF-67 template method for preparing cobalt-platinum core-shell particle/porous carbon composite material and catalytic application of composite material in cathode of fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) According to Co 2+ :Hmim :H 2 O = 1: 58: 1100 ratio, at room temperature, the concentration of A solution is prepared to be 1.8g Co(NO 3 ) 2 • 6H 2 O was dissolved in 12 mL of water, and B solution was prepared as 22 g of 2-methylimidazole dissolved in 80 mL of deionized water; the two solutions of A and B were mixed and stirred at 800 rpm for 6 h, and the obtained blue precipitate should be in turn centrifuged, washed three times with water, washed three times with methanol, and then placed in 60 o C dried in a vacuum oven for 24 h to obtain ZIF-67 nanocrystals. figure 1 (A, B) The ZIF-67 nanocrystals shown are faceted geometries with a size of 160-400 nm.

[0032] (2) Place the ZIF-67 nanocrystals obtained above in a tube furnace protected by argon (the gas flow rate of Ar gas is about 350 sccm), and the o C / min rate heating up to 600 o C and keep warm for 2 h, and then 5 o By cooling at a cooling rate of C / min, a cobalt nanoparticle composite (Co-NC) imm...

Embodiment 2

[0042] (1) According to Co 2+ :Hmim :H 2 O = 1: 58: 1100 ratio, at room temperature, the concentration of A solution is prepared to be 1.8g Co(NO 3 ) 2 • 6H 2 O was dissolved in 12 mL of water, and B solution was prepared as 22 g of 2-methylimidazole dissolved in 80 mL of deionized water; the two solutions of A and B were mixed and stirred at 800 rpm for 6 h, and the obtained blue precipitate should be in turn centrifuged, washed three times with water, washed with methanol, and placed at 60 o C dried in a vacuum oven for 24 h to obtain ZIF-67 nanocrystals. figure 1 (A, B) The ZIF-67 nanocrystals shown are faceted geometries with a size of 160-400 nm.

[0043] (2) Place the ZIF-67 nanocrystals obtained above in a tube furnace protected by argon (the flow rate of Ar gas is about 350 sccm), and the o C / min rate heating up to 600 o C and keep warm for 2 h, and then 5 o By cooling at a cooling rate of C / min, a cobalt nanoparticle composite (Co-NC) immobilized by nitrogen...

Embodiment 3

[0049] (1) According to Co 2+ :Hmim :H 2 O = 1: 58: 1100 ratio, at room temperature, the concentration of A solution is prepared to be 1.8g Co(NO 3 ) 2 • 6H 2 O was dissolved in 12 mL of water, and B solution was prepared as 22 g of 2-methylimidazole dissolved in 80 mL of deionized water; the two solutions of A and B were mixed and stirred at 800 rpm for 6 h, and the obtained blue precipitate should be in turn centrifuged, washed three times with water, washed three times with methanol, and then placed in 60 o C dried in a vacuum oven for 24 h to obtain ZIF-67 nanocrystals. figure 1 (A, B) The ZIF-67 nanocrystals shown are faceted geometries with a size of 160-400 nm.

[0050](2) Place the ZIF-67 nanocrystals obtained above in a tube furnace protected by argon (the flow rate of Ar gas is about 350 sccm), and the o C / min rate heating up to 600 o C and keep warm for 2 h, and then 5 o By cooling at a cooling rate of C / min, a cobalt nanoparticle composite (Co-NC) immobil...

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Abstract

The invention discloses application of a nitrogen-doped porous carbon fixed Co@Pt nano-particle composite material, prepared by taking ZIF-67 as a template, as an efficient catalyst for oxygen reduction catalytic reaction of a cathode of a fuel cell. The application has the superiorities that (1) a synthetic method of the catalyst is simple and feasible, the shape of the catalyst is controllable, batch preparation can be realized, and the catalytic performance is very stable; (2) the oxygen reduction catalytic reaction of nitrogen-doped porous carbon fixed cobalt-platinum core-shell nano-particles in the cathode of the fuel cell shows that the nano-particles have good catalytic activity and excellent methanol poisoning resistance stability, and compared with traditional commercial Pt/C, the nano-particles have relatively high take-off potentials and half-wave-peak potentials (nano-particles: 0.99V and 0.87V, and Pt/C: 0.98V and 0.83V); and (3) metal organic frameworks (MOFs) for preparing the catalyst have sequential microcellular structures and relatively large specific surface areas and can be widely applied to the storage and conversion of energy sources. Therefore, a method for simply and directly preparing cheap and efficient cathode oxygen reduction electro-catalyst is provided for the fuel cell and has a wide application prospect.

Description

technical field [0001] The invention uses a nitrogen-doped porous carbon-fixed Co@Pt nanoparticle composite material for efficient oxygen reduction catalytic reaction at the cathode of a fuel cell, and belongs to the technical field of catalysts and new energy materials. In particular, it relates to the preparation of a noble metal core-shell nanoparticle catalyst and its application in fuel cell cathode oxygen reduction electrocatalysis. Background technique [0002] A fuel cell is a device that can directly convert the chemical energy stored in fuel and oxidant into electrical energy. Fuel cells can be divided into the following five types according to their electrolytes: 1) Alkaline Fuel Cell (AFC); 2) Polymer Electrolyte Membrane Fuel Cell (PEMFC); 3) Phosphoric acid Phosphoric Acid Fuel Cell (PAFC); 4) Molten Carbonate Fuel Cell (MCFC); 5) Solid Oxide Fuel Cell (SOFC). Because PEMFC has the advantages of low working environment temperature, fast startup, high specific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92
CPCH01M4/88H01M4/9041H01M4/926Y02E60/50
Inventor 唐正华王立开陈少伟
Owner SOUTH CHINA UNIV OF TECH
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