Preparation method of nitrogen-phosphorus co-doped carbon nanotube-coated cobalt-iron bimetallic alloy in-situ electrode

A carbon nanotube, in-situ electrode technology, applied in battery electrodes, nanotechnology, nanotechnology and other directions, can solve the problems of inability to meet the requirements of high-energy electronic products, low catalytic activity of cathode catalysts, and low effective capacity of zinc-air batteries, etc. Achieve the effect of enhancing catalytic active sites, improving OER performance, and good electrical conductivity

Active Publication Date: 2021-07-20
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The inefficiency of simultaneous oxygen evolution reaction (OER) and redox reaction (ORR) catalysts is a key obstacle to the development of viable rechargeable Zn-air batteries
At present, platinum, ruthenium and their compounds are the most ideal catalysts, which have low overpotential and high current density during charge and discharge, however these noble metal catalysts are inevitably damaged in the alternating redox state of OER and ORR, So there is a problem of poor stability
Coupled with its high price and scarcity of resources, widespread application is hindered
Due to the low catalytic activity of the cathode catalyst, the existing alkaline zinc-air batteries cannot meet the requirements of high-energy electronic products, and the efficiency of the battery gradually decreases during the charging and discharging process.
Moreover, the effective capacity of zinc-air batteries is very low, and the high-current application market is occupied by rechargeable batteries such as lithium-ion batteries.

Method used

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  • Preparation method of nitrogen-phosphorus co-doped carbon nanotube-coated cobalt-iron bimetallic alloy in-situ electrode
  • Preparation method of nitrogen-phosphorus co-doped carbon nanotube-coated cobalt-iron bimetallic alloy in-situ electrode
  • Preparation method of nitrogen-phosphorus co-doped carbon nanotube-coated cobalt-iron bimetallic alloy in-situ electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] At room temperature, dissolve 0.58g of cobalt nitrate and 1.31g of 2-methylimidazole in 40mL of deionized water respectively. After mixing the two solutions, immerse in carbon paper. After standing for 4 hours, take out the carbon paper and rinse it with deionized water and absolute ethanol. Dry it for later use, and grow in situ on the surface of carbon paper to obtain a sheet-like MOF precursor. The above-mentioned carbon paper prepared for growing MOF was immersed in an aqueous solution of ferrous sulfate with a concentration of 0.05 mol / L. After immersion for 8 minutes, the sample was repeatedly rinsed with deionized water and then dried. The carbon paper was further placed in a polytetrafluoroethylene reactor containing 1 g of triphenylphosphine, and the carbon paper was taken out after reacting at 100° C. for 12 hours. Put the carbon paper into one end of the vacuum tube furnace, put 10g of urea into the other end of the vacuum tube furnace, 2 Annealing reaction ...

Embodiment 2

[0026] At room temperature, dissolve 0.58g of cobalt nitrate and 1.31g of 2-methylimidazole in 40mL of deionized water respectively. After mixing the two solutions, immerse in carbon paper. After standing for 4 hours, take out the carbon paper and rinse it with deionized water and absolute ethanol. Dry it for later use, and grow in situ on the surface of carbon paper to obtain a sheet-like MOF precursor. The carbon paper for growing MOF prepared above was immersed in an aqueous solution of ferrous sulfate with a concentration of 0.05 mol / L. After immersion for 15 minutes, the sample was repeatedly rinsed with deionized water and then dried. The carbon paper was further placed in a polytetrafluoroethylene reactor containing 1 g of triphenylphosphine, and the carbon paper was taken out after reacting at 100° C. for 12 hours. Put the carbon paper into one end of the vacuum tube furnace, put 10g of urea into the other end of the vacuum tube furnace, 2 Annealing reaction at 700° C...

Embodiment 3

[0035] At room temperature, dissolve 0.58g of cobalt nitrate and 1.31g of 2-methylimidazole in 40mL of deionized water respectively. After mixing the two solutions, immerse in carbon paper. After standing for 4 hours, take out the carbon paper and rinse it with deionized water and absolute ethanol. Dry it for later use, and grow in situ on the surface of carbon paper to obtain a sheet-like MOF precursor. The above-mentioned carbon paper for growing MOF was immersed in an aqueous solution of ferrous sulfate with a concentration of 0.02 mol / L. After immersion for 15 minutes, the sample was rinsed repeatedly with deionized water and then dried. The carbon paper was further placed in a polytetrafluoroethylene reactor containing 1 g of triphenylphosphine, and the carbon paper was taken out after reacting at 100° C. for 12 hours. Put the carbon paper into one end of the vacuum tube furnace, put 10g of urea into the other end of the vacuum tube furnace, 2 Annealing reaction at 700° ...

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Abstract

The invention discloses an in-situ composite electrode of a nitrogen-phosphorus co-doped carbon nanotube coated cobalt-iron bimetallic alloy catalyst, a preparation method and application thereof. The preparation method comprises: preparing an in-situ flaky MOF precursor on a carbon paper substrate; immersing the carbon paper growing the MOF precursor in a ferrous sulfate solution, and obtaining an iron-containing MOF in an aqueous solution cation exchange process; drying Then put it into the reaction kettle containing phosphorus source, and heat to realize gas-phase phosphorus doping; in Ar flow or N 2 In the gas flow, carbon nanotubes were prepared in situ by urea annealing. The product obtained by the technical solution of the present invention constructs a variety of highly electrocatalytic active sites, including metal particles coated on the top of carbon nanotubes, and nitrogen and phosphorus co-doped carbon active sites. It has excellent and stable three-functional catalytic activity of HER, OER and ORR.

Description

technical field [0001] The invention relates to an in-situ electrode and its preparation, in particular to a preparation method for an in-situ electrode of a cobalt-iron bimetallic alloy coated with nitrogen and phosphorus co-doped carbon nanotubes, and belongs to the field of energy storage and conversion materials and devices. Background technique [0002] The ever-increasing demands of energy consumption have posed major challenges to society's ability to maintain energy supplies. The development of efficient and stable energy storage and conversion devices (e.g., water electrolysis, metal-air batteries, fuel cells) has been a research topic in the field of electrocatalysis. Therefore, it is of great significance to find cathode materials with low overpotential, low energy consumption, and high-efficiency hydrogen production (HER) performance. The inefficiency of simultaneous oxygen evolution reaction (OER) and redox reaction (ORR) catalysts is a key obstacle in the deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/88B82Y30/00
CPCB82Y30/00H01M4/8842H01M4/8885H01M4/9041H01M4/9083Y02E60/50
Inventor 孙小华李鸣陈善华赵亚强黄妞孙盼盼
Owner CHINA THREE GORGES UNIV
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