Oxygen electrode bifunctional catalyst, preparation method and application

A bifunctional catalyst, oxygen electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of OER performance ORR active component ORR performance reduction, etc., and achieve the effect of improving electrocatalytic performance, reducing usage, and high dispersion.

Active Publication Date: 2021-07-13
BEIJING SATELLITE MFG FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method greatly reduces the OER performance of the OER active component and the ORR performance of the ORR active component.

Method used

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  • Oxygen electrode bifunctional catalyst, preparation method and application
  • Oxygen electrode bifunctional catalyst, preparation method and application
  • Oxygen electrode bifunctional catalyst, preparation method and application

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preparation example Construction

[0038] The preparation method of the oxygen electrode bifunctional catalyst of the present invention, firstly, the carbon carrier is used as a reducing agent, and the iridium salt is reduced at a high temperature to obtain elemental iridium, that is, the elemental iridium is loaded on the surface of the carbon carrier to form Ir / C; and then the Ir / C As a carrier, ethylene glycol is used as a reducing agent, and Ir / C is mixed with platinum salt, cobalt salt and tungsten salt, and reacted at a constant temperature in an oil bath to realize the precipitation of platinum, cobalt, and tungsten on Ir / C, and the catalyst PtCoW- Ir / C.

[0039] The above-mentioned carbon carrier is graphene, carbon black, carbon nanotube, graphitized carbon or porous carbon; the iridium salt is iridium tetrachloride.

[0040] The above-mentioned platinum salt is chloroplatinic acid, the cobalt salt is cobalt chloride, and the tungsten salt is tungsten carbonyl

[0041] The preparation method of the oxyg...

Embodiment 1

[0051] Preparation of PtCoW80-Ir40 / CB Bifunctional Catalyst

[0052] (1) Take 50 mg of carbon black (CB) as a carrier, ultrasonically disperse it in 20 mL of water: ethanol with a ratio of 1: 1 for 30 min, and then add IrCl 4 solution (0.1 mmol Ir) and 10 mg dopamine, and continue to sonicate for half an hour until they are evenly mixed. Then it was stirred by magnetic force for 12h, and then dried in an oven at 70°C.

[0053] (2) Grind the dried sample in an agate mortar for several minutes. Then at 900°C, the heating rate is 5°C / min, calcined in Ar atmosphere for 1h, and Ir is reduced by using carbon at high temperature. An OER catalyst with excellent performance can be obtained, which is marked as Ir40 / CB.

[0054] (3) Weigh 25.7mg of Ir40 / CB, add 38mL of ethylene glycol, and then put it into an ultrasonic machine to sonicate evenly, and then add 9.3mL of 0.01mM H 2 PtCl 6 Ethylene glycol solution, 0.31mL 0.1mMCoCl 2 Ethylene glycol solution and 1.1mg W(CO) 6 , 1.2 m...

Embodiment 2

[0057] Preparation of PtCoW80-Ir80 / CB Bifunctional Catalyst

[0058] (1) Take 50 mg of carbon black (CB) as a carrier, ultrasonically disperse it in 20 mL of water: ethanol with a ratio of 1: 1 for 30 min, and then add IrCl 4 solution (0.2 mmol Ir) and 10 mg dopamine, and continue to sonicate for half an hour until they are evenly mixed. Then it was stirred by magnetic force for 12h, and then dried in an oven at 70°C.

[0059] (2) Grind the dried sample in an agate mortar for several minutes. Then, at 800°C, the heating rate was 5°C / min, and calcined in Ar atmosphere for 1h, and Ir was reduced by using carbon at high temperature. An OER catalyst with excellent performance can be obtained, which is marked as Ir80 / CB.

[0060] (3) Weigh 25.7mg of Ir80 / CB, add 38mL of ethylene glycol, and then put it into an ultrasonic machine to sonicate evenly, and then add 9.3mL of 0.01mM H 2 PtCl 6 Ethylene glycol solution, 0.31mL 0.1mMCoCl 2 Ethylene glycol solution and 1.1mg W(CO) 6 ...

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Abstract

The present invention relates to an oxygen electrode bifunctional catalyst, its preparation method and its application. Firstly, a carbon carrier is used as a reducing agent, and an iridium salt is reduced and reacted with an iridium salt at high temperature to obtain elemental iridium, that is, the elemental iridium is loaded on the surface of the carbon carrier to form Ir / C; Then Ir / C is used as the carrier, ethylene glycol is used as the reducing agent, and Ir / C is mixed with platinum salt, cobalt salt and tungsten salt, and reacted at a constant temperature in an oil bath to realize the formation of elemental platinum, cobalt, and tungsten on Ir / C. Precipitate to obtain the catalyst PtCoW-Ir / C. The preparation method of the present invention is easy to operate and has strong operability. The prepared composite catalyst shows an obvious two-phase structure of simple substance Ir and PtCoW and is uniformly dispersed. The composite catalyst can be used in acidic environment Catalyzes oxygen reduction and oxygen evolution reactions, the electrocatalytic oxygen reduction reaction performance in acidic environment is better than commercial Pt / C, and the electrocatalytic oxygen evolution reaction performance is better than commercial iridium dioxide.

Description

technical field [0001] The invention relates to an oxygen electrode bifunctional catalyst, a preparation method and an application, and belongs to the technical field of electrocatalysts. Background technique [0002] With the development of social economy, people's demand for energy is increasing day by day. However, with the increasing use of fossil fuels, the depletion of fossil fuels and the increasingly serious environmental pollution, people are eager to develop and apply renewable energy. Such as wind power, hydropower and solar cells and fuel cells. Among them, fuel cells have attracted extensive attention due to their high energy density, high power density, low operating temperature, and small size. Fuel cells can not only be used as energy storage devices, storing electrical energy in the form of hydrogen. It can also be used as a battery, converting chemical energy into electrical energy. Secondary fuel cells involve the reduction of oxygen and the electrolys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92
CPCH01M4/921H01M4/926Y02E60/50
Inventor 王楠文陈冯磊刘景军白晶莹崔庆新李思振张立功王景润
Owner BEIJING SATELLITE MFG FACTORY
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