Bimetal cobalt oxide-based oxide as well as preparation method and application thereof

A cobalt oxide-based, bimetallic technology, applied in the directions of cobalt oxide/cobalt hydroxide, nickel oxide/nickel hydroxide, manganese oxide/manganese hydroxide, etc., can solve the problem that the catalytic reaction activity needs to be improved and restrict the spatial distribution of active sites. and other problems, to achieve the effects of excellent stability, improved catalytic performance, and excellent ORR performance.

Pending Publication Date: 2020-11-13
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the crystal form of the product, the spatial distribution of active sites is restricted, and its catalytic activity needs to be improved.

Method used

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  • Bimetal cobalt oxide-based oxide as well as preparation method and application thereof
  • Bimetal cobalt oxide-based oxide as well as preparation method and application thereof
  • Bimetal cobalt oxide-based oxide as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Cobalt oxide (Co 3 o 4 -Pg) preparation: 0.0012mol manganese (II) acetate tetrahydrate, 0.0048mol cobalt (II) acetate tetrahydrate and 60ml ethanol, 20mL 1,3-propanediol were stirred and mixed in 100mL Teflon inner lining for half an hour . The stainless steel autoclave was then heated in an oven at 180 °C for 1.5 hours. Afterwards, the resulting cobalt oxide precursor (i.e., CoPg) was collected, washed with ethanol, centrifuged, and dried overnight at 60 °C. Subsequently, the dried precursor was ground to obtain a powdered precursor. Finally, calcinate in air at 300°C for 2 hours (heating rate is 5°C.min -1 ). As mentioned above, Co3O is obtained 4 -Pg.

Embodiment 2

[0043] Manganese oxide (Mn 3 o 4 - Preparation of Pg): 0.0060 mol of manganese (II) acetate tetrahydrate, 60 ml of ethanol, and 20 ml of 1,3-propanediol were stirred and mixed in a 100 ml Teflon liner for half an hour. The stainless steel reactor was then heated in an oven at 180 °C for 1.5 h. Afterwards, the resulting manganese oxide precursor (i.e., MnPg) was collected, washed with ethanol, centrifuged, and dried overnight at 60 °C. Subsequently, the dried precursor was ground to obtain a powdered precursor. Finally, calcinate in air at 300°C for 2 hours (heating rate is 5°C.min -1 ) Prepare Mn as mentioned above 3 o 4 -Pg.

Embodiment 3

[0045] Preparation of manganese-cobalt double metal oxide cobalt-based oxide: 0.0012mol manganese(II) acetate tetrahydrate, 0.0048mol cobalt(II) acetate tetrahydrate and 60ml ethanol, 20mL 1,3-propanediol in 100mL Teflon The liners were stirred to mix for half an hour. The stainless steel autoclave was then heated in an oven at 180 °C for 1.5 hours. Afterwards, the resulting manganese-cobalt bimetallic precursor (i.e., MnCoPg) was collected, washed with ethanol, centrifuged, and dried overnight at 60 °C. Subsequently, the dried precursor was ground to obtain a powdered precursor. Finally, calcinate in air at 300°C for 2 hours (heating rate is 5°C.min -1 ). MnCoO-Pg is obtained.

[0046] figure 2 For the prepared Mn prepared in embodiment 1,2,3 3 o 4 -Pg, Co 3 o 4 -SEM images of Pg, MnCoO-Pg, where figure 2 (a) is a scanning electron microscope (SEM) image of the synthesized cobalt oxide catalyst precursor (CoPg), which is a hollow spherical structure; figure 2 (b...

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Abstract

The invention discloses a bimetal cobalt oxide-based oxide as well as a preparation method and application thereof. The general formula of the bimetal cobalt oxide-based oxide is MaCobOn, a is 0-3, bis 0-3, a and b do not include 0, n is determined by the oxidation state of other elements, M is selected from one or more of iron, nickel, manganese, zinc or copper, and the surface of the bimetal cobalt oxide-based oxide has defects. The invention also discloses a preparation method and application of the catalyst. The structure of the precursor is controlled by regulating the optimal metal ionratio of the two transition metals and changing the mixed alcohol solvent in the solvothermal reaction, and finally the MaCobOn with different active site distributions can be obtained. As an oxygen reduction catalyst, the MaCobOn has the advantages of proper defects, high activity and stable performance, and meanwhile, the introduction of M metal greatly improves the electron transfer efficiencyand realizes an efficient oxygen reduction process. The preparation process of MaCobOn is simple, the process operability is high, and MaCobOn has good application prospects in the fields of metal-airbatteries, fuel cells, electrolytic cells, super capacitors and the like.

Description

technical field [0001] The patent of the invention belongs to the technical field of electrocatalysts, and specifically relates to a double metal oxide cobalt-based oxide (M a co b o n ) Preparation method and application of catalyst. Background technique [0002] With the depletion of fossil fuels, the development of new, green and renewable energy sources has received extensive attention. Fuel cells are considered to be ideal energy conversion and storage technologies due to their high energy conversion efficiency and environmental friendliness. Proton exchange membrane fuel cells (PEMFC) are currently the most widely studied fuel cells. Reduction reaction (ORR) and hydrogen oxidation reaction (HOR), ORR process has become one of the key factors limiting the performance of fuel cells due to the complex kinetic process involved. At present, the ORR catalysts are mainly noble metals such as Pt, but such noble metal catalysts have limited resources and high costs, making ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04C01G53/04C01G45/02H01M4/90
CPCC01G51/04C01G45/02C01G53/04H01M4/9016C01P2002/72C01P2004/03C01P2006/17Y02E60/50
Inventor 王松博赵楠楠唐娜张蕾杜威程鹏高项军
Owner TIANJIN UNIV OF SCI & TECH
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