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MoO2/Ni-NC nano composite electrocatalyst as well as preparation method and application thereof

An electrocatalyst and nanocomposite technology, which is applied in the direction of electrodes, electrolytic components, electrolytic processes, etc., can solve the problems of high cost of noble metal doped modified electrocatalysts, and achieve the effects of strong reusability, mild conditions and high catalytic efficiency

Pending Publication Date: 2022-07-22
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a MoO 2 / Ni-NC nanocomposite electrocatalyst

Method used

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  • MoO2/Ni-NC nano composite electrocatalyst as well as preparation method and application thereof
  • MoO2/Ni-NC nano composite electrocatalyst as well as preparation method and application thereof
  • MoO2/Ni-NC nano composite electrocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step (1) Disperse 382 grams (2 moles) of nitrilotriacetic acid and 273 grams (1 moles) of molybdenum pentachloride in 20 liters of deionized water, then add 380 grams (1.6 moles) of nickel chloride hexahydrate, magnetic Stir for 20 minutes, then add 18 liters of isopropanol; magnetic stirring for 60 minutes at room temperature, water-soluble molybdenum pentachloride and nickel chloride hexahydrate are dissolved in deionized water and react with nitrilotriacetic acid;

[0028] In step (2), the mixture is transferred to an airtight container for heating reaction, and the reaction temperature is 250° C. and the reaction time is 5 hours;

[0029] Step (3) The product after the reaction is centrifuged with a high-speed centrifuge at a speed of 5000 rpm to get the precipitate, and then the precipitate is repeatedly washed with water to neutrality and then washed with absolute ethanol for 5 times, and then placed in a vacuum oven and dried at 80 ° C for 20 hours to obtain a pre...

Embodiment 2

[0034] Step (1) Disperse 287 grams (1.5 moles) of nitrilotriacetic acid and 196 grams (1 moles) of ammonium molybdate in 18 liters of deionized water, then add 183 grams (1 moles) of nickel nitrate and stir magnetically for 15 minutes at room temperature at room temperature. Add 20 liters of butanol; magnetic stirring at room temperature for 50 minutes, water-soluble ammonium molybdate and nickel nitrate are dissolved in deionized water and react with nitrilotriacetic acid;

[0035] In step (2), the mixture is transferred to an airtight container for heating reaction, and the reaction temperature is 160° C. and the reaction time is 8 hours;

[0036] Step (3) The product after the reaction is centrifuged with a high-speed centrifuge at a speed of 6000 rpm to get the precipitate, and then the precipitate is repeatedly washed with water until it is neutral, and then washed with absolute ethanol for 3 times, and then placed in a vacuum oven and dried at 50 ° C for 30 hours to obtai...

Embodiment 3

[0039] Step (1) Disperse 191 grams (1 mole) of nitrilotriacetic acid and 273 grams (1 mole) of molybdenum pentachloride in 17 liters of deionized water, then add 274 grams (1.5 moles) of nickel nitrate under normal temperature magnetic stirring for 45 minutes, Then add 19 liters of methanol; magnetic stirring at room temperature for 30 minutes, water-soluble molybdenum pentachloride and nickel nitrate are dissolved in deionized water and react with nitrilotriacetic acid;

[0040] In step (2), the mixture is transferred to an airtight container for heating reaction, and the reaction temperature is 200° C. and the reaction time is 6 hours;

[0041] Step (3) The product after the reaction is centrifuged with a high-speed centrifuge at a speed of 5800 rpm to get the precipitate, and then the precipitate is repeatedly washed with water to neutrality and then washed twice with absolute ethanol, placed in a vacuum oven and dried at 70 ° C for 24 hours to obtain a precursor. body;

...

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Abstract

The invention discloses a MoO2 / Ni-NC nano composite electrocatalyst as well as a preparation method and application thereof. The catalyst powder monomer is a nanosphere with a porous structure, nickel and molybdenum are uniformly distributed in the nanosphere, and carbon is dispersed and loaded on the spherical surface. The method comprises the following steps: dispersing nitrilotriacetic acid and molybdenum salt in water, then adding nickel salt and a solvent, uniformly mixing, transferring the mixture into a closed container, carrying out heating reaction, and separating, washing and drying the reaction product to obtain a precursor; calcining the precursor under the protection of inert gas, and cooling to obtain the catalyst. The electrocatalyst is applied to ammonia production through electrocatalytic reduction of nitrate. The method is mild in preparation condition, good in product purity and suitable for large-scale production and application. The catalyst has relatively high electrocatalytic activity, can effectively improve the transmission rate of electrons, and accelerates the efficiency of reducing nitrate radicals into ammonia; reactants are stable and convenient to store and use; the active center density is high, and the catalytic efficiency is high; and the reusability is high.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a kind of MoO 2 / Ni-NC nanocomposite electrocatalyst and preparation method and application thereof. Background technique [0002] Ammonia (NH 3 ) as a potential carbon-free energy carrier and an important raw material for most fertilizers, chemicals, and pharmaceutical-related products. NH 3 It is produced industrially by the traditional Haber-Bosch process under harsh experimental conditions (high temperature and high pressure). However, at high temperature (400-600 °C) and high pressure (>400 atm), N 2 The cleavage of stable N≡N bonds in 2 The reluctance of the reaction makes Haber-Bosch an energy-intensive process. Furthermore, the process shows typical NH 3 Yield <200mmolg- 1 h- 1 . NH 3 Not only does the production consume more than 1% of the world's energy supply, the process requires high energy consumption and generates large amounts of CO 2 Emissions i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/27
CPCC25B11/091C25B1/27
Inventor 高鹏邓苹
Owner HANGZHOU NORMAL UNIVERSITY