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Method for regulating and controlling nickel-based layered double hydroxides (LDHs) by doping with different metal ions

A hydroxide, metal ion technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc. achieve the effect of improving performance

Active Publication Date: 2018-12-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxygen evolution catalysts are divided into noble metal and non-noble metal catalysts, the former is limited in application due to the scarcity and high price of elements

Method used

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  • Method for regulating and controlling nickel-based layered double hydroxides (LDHs) by doping with different metal ions
  • Method for regulating and controlling nickel-based layered double hydroxides (LDHs) by doping with different metal ions
  • Method for regulating and controlling nickel-based layered double hydroxides (LDHs) by doping with different metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Weigh 5mmol nickel nitrate, 0.1mmol magnesium nitrate and 5mmol 2-methylimidazole in a 20ml polytetrafluoroethylene kettle.

[0018] (2) Add a certain amount of anhydrous methanol solution into the kettle so that the concentration of magnesium nitrate is 1.71g / L, ultrasonically or stir until completely dissolved.

[0019] (3) Place the polytetrafluoroethylene kettle in a stainless steel reaction kettle, and tighten the kettle cap.

[0020] (4) The stainless steel reaction kettle was placed in an oven and set to react at 80°C for 4 hours, the reaction was stopped, and the temperature was lowered to room temperature.

[0021] (5) Centrifuge at a speed of 10000-12000rpm in a centrifuge for 3-5min to collect the precipitate in the reaction solution, wash the precipitate repeatedly with methanol solution until the supernatant is colorless and transparent, then put the precipitate in a vacuum drying oven at 60°C for 8 hours, Finally, Ni-Mg LDHs powder was obtained.

Embodiment 2

[0023] (1) Weigh 5mmol nickel nitrate, 0.1mmol manganese nitrate and 5mmol 2-methylimidazole in a 20ml polytetrafluoroethylene kettle.

[0024] (2) Add a certain amount of anhydrous methanol solution into the kettle so that the concentration of manganese nitrate is 1.67g / L, sonicate or stir until completely dissolved.

[0025] (3) Place the polytetrafluoroethylene kettle in a stainless steel reaction kettle, and tighten the kettle cap.

[0026] (4) The stainless steel reaction kettle was placed in an oven and set to react at 80°C for 4 hours, the reaction was stopped, and the temperature was lowered to room temperature.

[0027] (5) Centrifuge at the speed of 8000-9000rpm in the centrifuge for 8-10min to collect the precipitate in the reaction solution, wash the precipitate repeatedly with methanol solution until the supernatant is colorless and transparent, then put the precipitate in a vacuum drying oven at 50°C for 10 hours, Finally, Ni-Mn LDHs powder was obtained.

Embodiment 3

[0029] (1) Weigh 5mmol nickel nitrate, 0.1mmol zinc nitrate and 5mmol 2-methylimidazole in a 20ml polytetrafluoroethylene kettle.

[0030] (2) Add a certain amount of anhydrous methanol solution into the kettle so that the concentration of zinc nitrate is 1.98g / L, sonicate or stir until completely dissolved.

[0031] (3) Place the polytetrafluoroethylene kettle in a stainless steel reaction kettle, and tighten the kettle cap.

[0032] (4) The stainless steel reaction kettle was placed in an oven and set to react at 80°C for 4 hours, the reaction was stopped, and the temperature was lowered to room temperature.

[0033] (5) Centrifuge at a speed of 10000-12000rpm in a centrifuge for 3-5min to collect the precipitate in the reaction solution, wash the precipitate repeatedly with methanol solution until the supernatant is colorless and transparent, then put the precipitate in a vacuum drying oven at 80°C for 4 hours, Finally, Ni-Zn LDHs powder was obtained.

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Abstract

The invention provides a method for regulating and controlling nickel-based layered double hydroxides (LDHs) by doping with different metal ions and belongs to the technical field of multifunctional material synthesis. A series of nickel-based metallic layered double hydroxides (Ni-M LDHs) are prepared by adopting a 2-methylimidazole-assisted solvothermal method. The results show that the macroscopic morphologies and the microstructures of the Ni-M LDHs can be affected by doping with the different metal ions; and the electronic transmission, the ion diffusion and the material transportation inelectrocatalytic oxygen production research are directly affected. The method for regulating and controlling the synthesis of the LDHs is simple, convenient and practicable and is mild in synthesis condition, good in flexibility and high in yield, so that the method is a relatively excellent synthesis method.

Description

technical field [0001] The invention belongs to the technical field of multifunctional material synthesis, and relates to a method for preparing a nickel-based double metal hydroxide doped with different metal ions to regulate and control it. Background technique [0002] As a new energy source, electrolyzed water is conducive to the high-efficiency release of heat energy and the preservation of non-renewable resources, and plays an important role in energy conversion and storage. Oxygen evolution in aqueous solution is the electrochemical reaction involved. OER is a redox reaction of multiple electron transfer, and the existence of the rate-controlling step makes the chemical reaction kinetic coefficient low and the speed is slow. The preparation of efficient OER electrocatalyst is It is an important factor related to the new energy of oxygen evolution in the future. Oxygen evolution catalysts are divided into noble metal and non-noble metal catalysts, and the former is li...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J23/78B01J23/80B01J23/889C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J23/755B01J23/78B01J23/80B01J23/8892B01J35/33Y02E60/36
Inventor 陈立勇张瀛月李德芝王艳鑫段春迎
Owner DALIAN UNIV OF TECH
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