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Dual-function catalyst and preparation thereof and application in metal-air battery

A bifunctional catalyst, cobalt oxide technology, applied in battery electrodes, fuel cell half-cells, primary battery half-cells, circuits, etc., can solve the problems that need to be improved, the catalyst preparation process is cumbersome, etc., and achieve superior electrochemical Performance and repeatability, excellent electrochemical performance and charge and discharge performance, the effect of mild reaction conditions

Inactive Publication Date: 2015-10-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, MnCo2O4 has been widely used in alkaline fuel cells. However, the preparation process of the above catalysts is cumbersome, and both electrochemical performance, charge and discharge performance, and cycle life need to be improved.

Method used

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  • Dual-function catalyst and preparation thereof and application in metal-air battery
  • Dual-function catalyst and preparation thereof and application in metal-air battery
  • Dual-function catalyst and preparation thereof and application in metal-air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A bifunctional catalyst comprising carbon nanotubes, cobalt oxide and manganese dioxide. The manganese dioxide is tubular, with a length of 1-3 μm and an inner diameter of 7-10 nm; cobalt oxide is a nano particle with a diameter of 10-20 nm; carbon nanotubes, cobalt oxide and manganese dioxide are compounded together.

[0037] The preparation method of bifunctional catalyst of the present invention is:

[0038] (1) configuration potassium permanganate and the mass ratio of water are the uniform mixed aqueous solution of 1.2: 100, under room temperature the ratio of potassium permanganate solution and concentrated hydrochloric acid (concentration is 37.5%, the same below) is 101.2g: 4ml Slowly add concentrated hydrochloric acid into the stirred potassium permanganate solution, stir until the mixture is uniform, pour the uniform solution into an autoclave at 140°C for 12 hours by hydrothermal method, cool to room temperature, wash with ethanol and deionized water for 3 t...

Embodiment 2

[0046] Dissolve the catalyst powder prepared in Example 1 of 5 mg in 1 ml of ethanol and 8 μl of 5% nafion solution, ultrasonically form a homogeneous catalyst slurry for 30 minutes, then drop-coat it on the disk electrode to obtain a catalyst loading of 50 μg, then let it air in the air Dry. The polarization curves of the catalysts were measured with an electrochemical workstation. Oxygen was introduced into the 0.1mol / L potassium hydroxide solution for 30 minutes, and then the disk electrode coated with the catalyst was used as the working electrode, and the saturated calomel electrode and the Pt electrode were respectively used as the reference electrode and the counter electrode, and the CNTs, Co3O4 / Polarization curves of MnO2 / CNTs, Co3O4 / MnO2.

[0047] Experimental results such as figure 2 As shown, the results show that the bifunctional performance of the catalyst is obvious, the peak potential of ORR is at 1.04V, and the peak potential of OER is at 1.45V. At 0.2V, ...

Embodiment 3

[0049] The catalyst powder prepared in Example 1 of 5 mg was dissolved in 1 ml of ethanol and 8 μl of 5% nafion solution, ultrasonicated for 30 minutes to form a uniform catalyst slurry, and then drip-coated on the disk electrode to make the catalyst loading 50, 100, 150 , 200, 250μg, and then dry naturally. The polarization curves of the catalysts were measured with an electrochemical workstation. Oxygen was introduced into the 0.1mol / L potassium hydroxide solution for 30 minutes, and then the disk electrode coated with the catalyst was used as the working electrode, and the saturated calomel electrode and the Pt electrode were respectively used as the reference electrode and the counter electrode. Polarization curve of a three-way catalyst.

[0050] Experimental results such as image 3 As shown, the results show that the bifunctional performance of the catalyst is obvious. Under different loadings, the peak potential of ORR is almost 1.04V, and the peak potential of OER i...

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Abstract

The invention provides a dual-function catalyst and preparation thereof and application in a metal-air battery. The preparation method of the dual-function catalyst is characterized by comprising the steps that firstly, a manganese dioxide precursor is prepared; secondly, the manganese dioxide precursor, cobalt nitrate and carbon nano tubes with the mass ratio of 0.5-1:1:0.25-0.5 are weighed respectively and dissolved in 1-1.5 mol / L of ammonium hydroxide, ultrasonic dispersion is carried out for 0.5-1.5 hours, the mixture is then transferred into a high-pressure autoclave to be reacted for 3-6 hours at 140-160 DEG C and then is cooled to the room temperature, and the mixture is cleaned with deionized water for 3-5 times and then dried for 6-10 hours at 50-70 DEG C; after drying, roast is carried out in a muffle furnace at 350-450 DEG C for 0.5-1.5 hours, the mixture is ground into powder when the temperature is lowered to 60 DEG C, and the dual-function catalyst is obtained. The dual-function catalyst has both the efficient oxygen reduction performance and the efficient oxygen evolution performance in air.

Description

technical field [0001] The invention belongs to the field of new energy battery preparation and application, and in particular relates to the preparation of a high-efficiency bifunctional catalyst and its application in metal air. Background technique [0002] In recent years, due to the waste of fossil fuels, the increasing global demand for energy, and the growing awareness of environmental friendliness, countries around the world have competed to develop and research clean and sustainable energy conversion devices, in which high-efficiency energy storage and conversion using electrochemical reactions Devices have received a great deal of attention [NanoLett. 2012, 12, 1946-1952]. In particular, rechargeable metal-air batteries have attracted widespread attention due to their unique advantages of simple preparation, safety, and environmental friendliness, as well as high theoretical specific energy and energy density. Especially in terms of economic benefits and environme...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/06H01M4/86
CPCH01M4/8652H01M4/9016H01M12/06
Inventor 乔锦丽徐能能武明杰菅赛赛马承愚
Owner DONGHUA UNIV
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