Cobalt-based petal-like composite material loaded by silver nanoparticles and preparation method and application of composite material

A technology of silver nanoparticles and composite materials, applied in the field of electrocatalysis, can solve the problems of limiting commercial applications, increasing catalyst costs, poor catalytic activity, etc., and achieves excellent OER performance, good long-term stability, and high specific surface area.

Inactive Publication Date: 2019-09-27
QUFU NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its low conductivity and poor catalytic activity still cannot meet the industrial application of hydrogen production by electrolysis of water.
At the same time, in the preparation process of transition metal-based electrocatalysts, the introduction of noble metals tends to improve its catalytic performance, but this will increase the cost of the catalyst and limit its commercial application, and the noble metals introduced are mostly ruthenium, iridium, and platinum. And gold, etc., its cost is much higher than that of silver

Method used

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  • Cobalt-based petal-like composite material loaded by silver nanoparticles and preparation method and application of composite material
  • Cobalt-based petal-like composite material loaded by silver nanoparticles and preparation method and application of composite material
  • Cobalt-based petal-like composite material loaded by silver nanoparticles and preparation method and application of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take 0.50g of cobalt acetate and dissolve it in 50.0ml of anhydrous methanol solution, stir magnetically to make it completely dissolved, add 0.18g of 2-methylimidazole, and disperse by ultrasonic for 20-30 minutes.

[0027] (2) Transfer the above-mentioned solution to a 100ml reaction kettle, set the reaction temperature to 120°C, and set the reaction time to 12 hours. After cooling to room temperature naturally, filter and wash with anhydrous methanol and secondary water three times respectively. Dry it in a vacuum oven at 60°C and grind it for later use. The sample obtained at this time is designated as Co.

[0028] (3) Take 50.0 mg of the powder sample obtained above and dissolve it in 20.0 ml of anhydrous methanol, ultrasonically disperse it fully, then add 1.0 ml of 10.0 mmol / L silver nitrate solution, stir magnetically for 1 hour, then add 5.0 ml drop by drop Prepare 0.25 mol / L sodium borohydride solution with ice water, transfer the experimental device to a ...

Embodiment 2

[0030] (1) Take 0.50g of cobalt acetate and dissolve it in 50.0ml of anhydrous methanol solution, stir magnetically to make it completely dissolved, add 0.18g of 2-methylimidazole, and disperse by ultrasonic for 20-30 minutes.

[0031] (2) Transfer the above-mentioned solution to a 100ml reaction kettle, set the reaction temperature to 120°C, and set the reaction time to 12 hours. After cooling to room temperature naturally, filter and wash with anhydrous methanol and secondary water three times respectively. Dry it in a vacuum oven at 60°C and grind it for later use. The sample obtained at this time is designated as Co.

[0032] (3) Take 50.0 mg of the powder sample obtained above and dissolve it in 20.0 ml of anhydrous methanol, ultrasonically disperse it fully, then add 2.0 ml of 10.0 mmol / L silver nitrate solution, stir magnetically for 1 hour, then add 5.0 ml drop by drop Prepare 0.25 mol / L sodium borohydride solution with ice water, transfer the experimental device to a ...

Embodiment 3

[0034] (1) Take 0.50g of cobalt acetate and dissolve it in 50.0ml of anhydrous methanol solution, stir magnetically to make it completely dissolved, add 0.18g of 2-methylimidazole, and disperse by ultrasonic for 20-30 minutes.

[0035] (2) Transfer the above-mentioned solution to a 100ml reaction kettle, set the reaction temperature to 120°C, and set the reaction time to 12 hours. After cooling to room temperature naturally, filter and wash with anhydrous methanol and secondary water three times respectively. Dry it in a vacuum oven at 60°C and grind it for later use. The sample obtained at this time is designated as Co.

[0036] (3) Dissolve 50.0 mg of the powder sample obtained above in 20.0 ml of anhydrous methanol, disperse it fully by ultrasonication, then add 4.0 ml of 10.0 mmol / L silver nitrate solution, stir magnetically for 1.0 hour, then add 5.0 ml drop by drop Prepare 0.25 mol / L sodium borohydride solution with ice water, transfer the experimental device to a dark p...

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Abstract

The invention belongs to the technical field of electrocatalysis, and specifically relates to a cobalt-based petal-like composite material loaded by silver nanoparticles and a preparation method and application of the composite material. A catalyst successfully loads the silver nanoparticles onto the surface of a cobalt-based petal-like composite material by a simple hydrothermal reaction and a reduction reaction at room temperature; meanwhile, the structure and morphology of the cobalt-based material are still well maintained after the introduction of silver, and an open petal-like structure provides favorable conditions for material transport and charge transfer. Electrochemical test results show that the catalyst has excellent OER (Oxygen evolution reaction) activity, the overpotential is only 268 mV when the current density is 10 mA / cm<2>, and the catalyst is far superior to a commercial RuO2 catalyst; in addition, the catalyst has good long-term stability. The preparation method provided by the invention does not need precision equipment, is low in energy consumption, wide in source of raw materials, and low in cost, can realize gram-level preparation, and has important practical value.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a cobalt-based petal-shaped composite material supported by silver nanoparticles and a preparation method and application thereof. Background technique [0002] Hydrogen energy has attracted widespread attention as an environmentally friendly and renewable green energy. Water electrolysis is an ideal way to obtain high-purity hydrogen, which consists of two half-reactions: the hydrogen evolution reaction (HER) at the cathode and the oxygen evolution reaction (OER) at the anode. However, OER is a slow kinetically controlled four-electron transfer process, which requires a high overpotential to overcome the corresponding reaction energy barrier, which also directly affects the overall energy conversion efficiency of water electrolysis. Today, oxides of noble metals such as ruthenium and iridium are considered to be the best OER catalysts. However, high prices...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/10B01J35/02C25B11/06C25B1/04
CPCB01J23/8913B01J35/0033B01J35/02B01J35/1004C25B1/04C25B11/04Y02E60/36
Inventor 冯媛媛扈华帅司思刘瑞杰王重斌
Owner QUFU NORMAL UNIV
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