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Preparation method and application of spinel type oxide catalyst

A spinel-type, oxide-based technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low reserves, low electrochemical activity, power learning slowness

Pending Publication Date: 2020-10-30
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, rechargeable metal-air batteries are considered to be one of the most promising energy storage and conversion devices due to their high energy density, low cost, and no pollution. However, the oxygen evolution reaction (oxygen evolution) at the cathode reaction, OER) and oxygen reduction reaction (oxygen reduction reaction, ORR) due to slow kinetics, significantly affect the charge and discharge rate, energy efficiency and cycle life of the battery
Currently, the best OER and ORR electrocatalysts are mainly IrO 2 / RuO 2 and noble metal Pt-based materials, but its high cost, low reserves, and poor stability hinder the large-scale application of this type of catalyst
[0003] Studies have shown that spinel-type oxides are low-cost, oxidation-resistant, and environmentally friendly catalyst materials that are very stable under alkaline or oxidative conditions. They are usually prepared by traditional solid-state sintering methods, which generally require higher heating temperatures And longer reaction time, not only consumes energy and time, but also has large particle size, small specific surface area and low electrochemical activity

Method used

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  • Preparation method and application of spinel type oxide catalyst
  • Preparation method and application of spinel type oxide catalyst
  • Preparation method and application of spinel type oxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A preparation method of a spinel-type cobalt-iron oxide catalyst is carried out according to the following steps:

[0057] Step 1: Cobalt, iron and aluminum (atomic ratio: 5:10:85) are jointly heated to a molten state in a vacuum induction melting furnace to obtain an alloy liquid, and the alloy liquid is directly cooled in an argon atmosphere to form a rod-shaped alloy Ingots, and then use a vacuum stripping device to melt the alloy ingots to obtain alloy liquid again, and use the air pressure difference to blow the alloy liquid onto the copper roller with a speed of 1500r / min. After the alloy liquid cools rapidly, it can be blown to form a wide Alloy strips with a diameter of 2 mm and a thickness of 50 μm;

[0058] Step 2. Place the cobalt-iron-aluminum alloy strips obtained in step 1 in a sodium hydroxide solution with a molar concentration of 2 mol / L for dealloying. The reaction time is 36 hours. After being rinsed with ultrapure water for many times, it is dried to...

Embodiment 2

[0062] A preparation method of a spinel type manganese oxide catalyst is carried out according to the following steps:

[0063] Step 1. Use a vacuum induction melting furnace to heat manganese and aluminum (atomic ratio: 10:90) together to a molten state to obtain an alloy liquid, and directly cool the alloy liquid in an argon atmosphere to form a rod-shaped alloy ingot, and then use The vacuum stripping device melts the alloy ingot to obtain the alloy liquid again, and uses the air pressure difference to blow the alloy liquid onto the copper roller with a rotation speed of 1000r / min. After the alloy liquid is cooled rapidly, it can be blow-cast to form a 3mm wide and thick 30μm alloy strip;

[0064] Step 2. Place the manganese-aluminum alloy strip obtained in step 1 in a potassium hydroxide solution with a molar concentration of 6mol / L for dealloying. The reaction time is 12 hours. After being rinsed with ultrapure water for many times, it is dried to obtain manganese Hydrox...

Embodiment 3

[0068] A preparation method of a spinel-type nickel-cobalt oxide catalyst is carried out according to the following steps:

[0069] Step 1. Using a vacuum induction melting furnace to heat nickel, cobalt and aluminum (atomic ratio 10:20:70) together to a molten state to obtain an alloy liquid, and directly cool the alloy liquid in an argon atmosphere to form a rod-shaped alloy Then the alloy ingot is melted with a vacuum stripping device to obtain the alloy liquid again, and the alloy liquid is blown to the copper roller with a speed of 2000r / min by using the air pressure difference. After the alloy liquid is cooled rapidly, it can be blown to form a wide Alloy strips with a diameter of 3 mm and a thickness of 60 μm;

[0070] Step 2. Place the nickel-cobalt-aluminum alloy strip obtained in step 1 in a sodium hydroxide solution with a molar concentration of 4mol / L for dealloying treatment. The reaction time is 24 hours. After repeated washing with ultrapure water, it is dried t...

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Abstract

The invention discloses a preparation method of a spinel type oxide catalyst. One or two transition metals of cobalt, iron, nickel, manganese, copper, chromium and zinc and aluminum are jointly heatedto a molten state by adopting a vacuum induction melting furnace, cooling is performed to obtain a rod-shaped alloy ingot, a vacuum melt-spinning device is employed for melting for blow casting intoa corresponding alloy strip, carrying out dealloying treatment on the alloy strip in an alkaline solution to obtain a dealloyed product, and in order to improve the crystallinity and stability of thematerial, the dealloyed product is placed in a tubular furnace for high-temperature annealing treatment in an air atmosphere, thus obtaining the spinel type oxide catalyst. The invention also relatesto application of the electrode material. The obtained catalyst has a multi-metal mixed valence state, can significantly enhance the conductivity of the material, shows good electrocatalytic activityto oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in an alkaline environment, has good stability, and can be used as a cathode catalyst of a chargeable and dischargeable metal-airbattery.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a preparation method and application of a spinel oxide catalyst. Background technique [0002] At present, the excessive exploitation and use of traditional fossil fuels is the main cause of environmental pollution and energy shortages worldwide. It can be seen that the development of renewable green new energy has become the most urgent demand in today's society. In recent years, rechargeable metal-air batteries are considered to be one of the most promising energy storage and conversion devices due to their high energy density, low cost, and no pollution. However, the oxygen evolution reaction (oxygen evolution) at the cathode reaction (OER) and oxygen reduction reaction (oxygen reduction reaction, ORR) have a significant impact on the charge-discharge rate, energy efficiency, and cycle life of the battery due to their slow kinetics. Currently, the best OER and OR...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J23/34B01J23/755B01J23/72B01J23/86B01J23/06B01J35/10C25B11/06C25B1/04
CPCB01J23/75B01J23/34B01J23/755B01J23/72B01J23/862B01J23/06C25B11/04C25B1/04B01J35/33B01J35/61Y02E60/36
Inventor 王美王慧奇李莹侯华
Owner ZHONGBEI UNIV
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