Cobalt metaphosphate/nitrogen-carbon-oxygen reduction catalyst as well as preparation method and application thereof

A cobalt metaphosphate and catalyst technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low initial potential and half-wave potential, and achieve the effect of simple method, enhanced ORR performance, and promotion of electrocatalytic activity.

Active Publication Date: 2020-01-17
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing transition metal metaphosphate as the synthesis step of fuel cell oxygen reduction catalyst, low initial potential and half-wave potential, and provide a "guniang" type nitrogen-doped carbon-coated Cobalt oxygen reduction catalyst and preparation method of metaphosphate

Method used

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  • Cobalt metaphosphate/nitrogen-carbon-oxygen reduction catalyst as well as preparation method and application thereof
  • Cobalt metaphosphate/nitrogen-carbon-oxygen reduction catalyst as well as preparation method and application thereof
  • Cobalt metaphosphate/nitrogen-carbon-oxygen reduction catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Accurately weigh 582.10 mg Co(NO 3 ) 2 ·6H 2 The O solid was dissolved in 20 mL of methanol solution, and then ultrasonically and magnetically stirred until a transparent pink cobalt nitrate methanol solution was obtained.

[0028] (2) Slowly drop 2 mL of ATMP aqueous solution with a mass concentration of 50 wt.% into the above-mentioned cobalt nitrate methanol solution drop by drop, react for 15 minutes to obtain a mixed solution, and then centrifuge, wash, and dry to obtain pink cobalt metaphosphate Coordination polymer precursors.

[0029] (3) The cobalt metaphosphate coordination polymer precursor formed in step 2 was placed in a tube furnace, and calcined at 700 °C for 1 h under a protective gas atmosphere to obtain a cobalt metaphosphate / nitrogen carbon oxygen reduction catalyst.

[0030] figure 1 According to the X-ray diffraction pattern of the product obtained in Example 1 of the present invention, all X-ray powder diffraction peaks can be indexed as Co...

Embodiment 2

[0032] (1) Accurately weigh 1164.2 mg Co(NO 3 ) 2 ·6H 2 The O solid was dissolved in 20 mL of methanol solution, and then ultrasonically and magnetically stirred until a transparent pink cobalt nitrate methanol solution was obtained.

[0033] (2) Slowly drop 2 mL of ATMP aqueous solution with a mass concentration of 55 wt.% into the above-mentioned cobalt nitrate methanol solution, and react for 30 minutes to obtain a mixed solution, which is then centrifuged, washed, and dried to obtain pink cobalt metaphosphate Coordination polymer precursors.

[0034] (3) The cobalt metaphosphate coordination polymer precursor formed in step 2 was placed in a tube furnace, and calcined at 800 °C for 1 h under a protective gas atmosphere to obtain a cobalt metaphosphate / nitrogen carbon oxygen reduction catalyst.

Embodiment 3

[0036](1) Accurately weigh 1746.18 mg Co(NO 3 ) 2 ·6H 2 The O solid was dissolved in 20 mL of methanol solution, and then ultrasonically and magnetically stirred until a transparent pink cobalt nitrate methanol solution was obtained.

[0037] (2) Slowly drop 2 mL of ATMP aqueous solution with a mass concentration of 60 wt.% into the above-mentioned cobalt nitrate methanol solution, and react for 60 minutes to obtain a mixed solution, which is then centrifuged, washed, and dried to obtain pink cobalt metaphosphate Coordination polymer precursors.

[0038] (3) The cobalt metaphosphate coordination polymer precursor formed in step 2 was placed in a tube furnace, and calcined at 900 °C for 2 h under a protective gas atmosphere to obtain a cobalt metaphosphate / nitrogen carbon oxygen reduction catalyst.

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Abstract

The invention discloses a cobalt metaphosphate / nitrogen-carbon-oxygen reduction catalyst as well as a preparation method and application thereof, and belongs to the field of catalyst materials. The catalyst is a Co (PO3) 2 / NC nano material, wherein NC is a nitrogen-doped carbon material, and the preparation method comprises the following steps of slowly dripping an ATMP aqueous solution into a methanol solution of cobalt nitrate drop by drop, reacting for 15-120 minutes, centrifuging, washing and drying to obtain a precursor; and calcining the precursor for 1-3 hours at 700-900 DEG C in a protective gas atmosphere to obtain the catalyst. The cobalt metaphosphate / nitrogen carbon prepared by the invention is formed by compactly and vertically crossing a plurality of ultrathin nanosheets, thethickness of the nanosheet ranges from 20 nm to 50 nm, and the length of the nanosheet ranges from 0.5 micrometer to 2 micrometers. The nanosheet is loaded with a plurality of cobalt metaphosphate nano-particles, and the size of the nanosheet is about 10 nm. The catalyst has higher initial potential and half-wave potential, high stability and high methanol tolerance.

Description

technical field [0001] The invention relates to the field of catalyst materials, more specifically, to a cobalt metaphosphate / nitrogen carbon oxygen reduction catalyst and its preparation method and application. Background technique [0002] Traditional fuel vehicles are one of the main sources of environmental pollution, and controlling the energy consumption and emissions of fuel vehicles is an important means to solve environmental problems. In recent years, with the increasingly prominent environmental and energy issues, new energy vehicles are gradually replacing the use of traditional fuel vehicles due to their clean and pollution-free features, and have become a research hotspot for major automobile manufacturers and scientific research institutions in the world. Fuel cell vehicles can truly achieve zero emissions and are considered to be the ultimate solution for new energy vehicles. There are still many difficulties in the large-scale commercialization of fuel cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88B82Y40/00
CPCH01M4/9083H01M4/9016H01M4/8825B82Y40/00Y02E60/50
Inventor 单丹徐莲花刘子萱鲁昆昆
Owner NANJING UNIV OF SCI & TECH
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