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Application of heteroatom-doped porous-carbon-coated Co9S8 composite catalyst

A porous carbon and heteroatom technology, applied in the fields of composite catalysts, electrocatalysis and zinc-air batteries, can solve the problems of less research and achieve the effect of increasing active sites, good stability and large contact area

Inactive Publication Date: 2019-05-03
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that transition metal sulfides supported on heteroatom-doped porous carbon materials have strong catalytic activity in the field of electrocatalytic oxygen evolution reaction, but there are still relatively few studies in the fields of electrocatalytic oxygen reduction and metal-air batteries.

Method used

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  • Application of heteroatom-doped porous-carbon-coated Co9S8 composite catalyst
  • Application of heteroatom-doped porous-carbon-coated Co9S8 composite catalyst
  • Application of heteroatom-doped porous-carbon-coated Co9S8 composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Synthesis of heteroatom-doped porous carbon material coated Co 9 S 8 Composite catalyst

[0032](1) Dissolve 13mg cobalt nitrate trihydrate and 2.5mg terephthalic acid and 11.2mg 4,4'-(sulfodithiobis(4,1-phenylene))dipyridine in 1mL N,N - Dimethylformamide and 0.5 mL deionized water. Then stirred and refluxed at 90°C for 48h to obtain red crystals. The precursor (Co-MOF) was obtained after filtration, washing with N,N-dimethylformamide three times, and vacuum drying.

[0033] (2) 200 mg of the precursor (Co-MOF) crystal obtained in step (1) was pulverized and ground, placed in a quartz boat, and the quartz boat was placed in a tube furnace, and the air in the furnace was first vented with nitrogen for 30 minutes, and then Under a nitrogen atmosphere, the tube furnace was heated to 900°C at a rate of 10°C / min, and calcined at a constant temperature of 900°C for 3h. Naturally cooled to room temperature to obtain a black loose solid, which was ultrasonicall...

Embodiment 2

[0034] Example 2: The heteroatom-doped porous carbon-coated Co prepared by the present invention 9 S 8 Performance testing of composite materials as electrocatalysts

[0035] With 4mg Co of the present invention 9 S 8 The @TDC catalyst was added to 100 μL of N,N-dimethylformamide solution, 10 μL of 5% Nafion solution by mass percentage was added, and a uniformly dispersed catalyst slurry was obtained after ultrasonic dispersion for 30 min. 10 μL of the slurry was drop-coated on the rotating disk electrode and dried at room temperature. The electrocatalytic performance test adopts a three-electrode system, with silver-silver chloride (Ag / AgCl) electrode as the reference electrode, platinum wire as the auxiliary electrode, 0.1mol L -1 Potassium hydroxide aqueous solution is the electrolytic solution. The test instrument is a constant potential / current meter of Wavedriver10 from Pine Company, and an MSR rotating disk electrode device.

[0036] Such as Figure 5 shown, satu...

Embodiment 3

[0039] Example 3: Heteroatom-doped porous carbon-coated Co prepared by the present invention 9 S 8 Application of composite catalysts in zinc-air batteries.

[0040] combine Figure 9 Schematic diagram of the zinc-air battery setup used for testing. The negative pole is a zinc plate, and the positive pole is nickel foam loaded with the catalyst prepared in the present invention. The electrolyte is 6mol L -1 Potassium hydroxide aqueous solution, the positive and negative electrodes are separated by a diaphragm, the side of the positive electrode in contact with the air is a gas diffusion layer, and the gas diffusion layer is made of conductive carbon black and polytetrafluoroethylene.

[0041] Figure 10 Polarized discharge curves and corresponding power density curves for Zn-air battery devices assembled with the as-prepared catalysts at current densities of 10 and 100 mA cm -2 , the battery voltages are 1.20V and 0.85V respectively, and the maximum power density of the ...

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Abstract

The invention discloses an application of a heteroatom-doped porous-carbon-coated Co9S8 composite catalyst in an electrocatalytic oxygen reduction reaction, and belongs to the technical field of composite catalysts and electrocatalytic oxygen reduction and zinc-air batteries. The composite catalyst regards a nitrogen-oxygen-sulfur triple heteroatom-doped mixed type cobalt-based metal-organic framework material (abbreviated as Co-MOF) as a precursor, is obtained through subjecting the Co-MOF to carbonization, and is used for high-efficiency electrocatalytic oxygen reduction. In a 0.1 mol L<-1>potassium hydroxide electrolyte, the oxygen reduction half-wave potential of the catalyst is 0.78 V, the limited diffusion current is 5.45 mA cm<-2>. The zinc-air battery assembled by adopting the prepared catalyst is subjected to cyclic charge and discharge tests for 48 h, and the charge and discharge voltage difference does not change significantly, thereby indicating that the prepared catalysthas very high stability and has high practical application value.

Description

technical field [0001] The invention relates to the technical field of composite catalysts, electrocatalysis and zinc-air batteries, in particular to a heteroatom-doped porous carbon-coated Co 9 S 8 Applications of composite catalysts in electrocatalytic oxygen reduction reactions and zinc-air batteries. Background technique [0002] The continuous growth of global energy demand and the excessive dependence of human beings on the supply of fossil fuels (such as coal, oil and natural gas) make human beings gradually fall into an energy crisis. Although wind and solar energy have been developed, efficient use of these clean energies is currently the biggest technical challenge. Therefore, electrochemical energy storage technology came into being. Batteries are an important class of electrochemical energy storage technologies, and rechargeable zinc-air batteries are considered to be one of the most promising energy storage systems because of their high theoretical energy den...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M12/06
Inventor 董喜燕王锐赵金燕臧双全
Owner HENAN POLYTECHNIC UNIV
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