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Transition metal nitride/carbon electrocatalyst and preparation method and application of transition metal nitride/carbon electrocatalyst

A transition metal, electrocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, electrodes, etc., can solve the problems of large overpotential, single hydrogen evolution or oxygen evolution performance of catalyst materials, etc., to achieve excellent electrical performance, excellent The effect of electrocatalytic performance

Active Publication Date: 2018-10-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the above analysis, there are currently more solutions. The catalyst material mainly has a single hydrogen evolution or oxygen evolution performance, and has a large overpotential in the hydrogen evolution reaction and oxygen evolution reaction.

Method used

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  • Transition metal nitride/carbon electrocatalyst and preparation method and application of transition metal nitride/carbon electrocatalyst
  • Transition metal nitride/carbon electrocatalyst and preparation method and application of transition metal nitride/carbon electrocatalyst
  • Transition metal nitride/carbon electrocatalyst and preparation method and application of transition metal nitride/carbon electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Forming the shell directly on the surface of the substrate is as follows:

[0092]Dissolve 0.2mmol copper nitrate trihydrate in 40mL N,N-dimethylformamide (DMF) to form reaction solution A, dissolve 1mmol 2-aminoterephthalic acid in 15mL DMF to form reaction solution B, and dissolve the reaction solution B was added to reaction solution A, stirred by magnetic force for 15 minutes, then transferred to a polytetrafluoroethylene lining, then added a piece of cleaned foam nickel, sealed and placed in a stainless steel autoclave and reacted at 120 ° C for 24 hours, naturally Cool to room temperature (25°C). The product was washed three times with absolute ethanol and water, and then dried at 60°C to obtain the composite precursor of copper metal organic framework and nickel foam; the above composite precursor of copper metal organic framework and nickel foam was placed in a tube furnace, and the Under an ammonia atmosphere, set the heating rate at 5°C / min, hold temperature ...

Embodiment 2

[0094] Add 3mmol of urea to 80ml of 1mM cobalt chloride solution, stir until completely dissolved into a transparent solution, add a piece of clear and clean nickel foam, package it in a reaction kettle, set the reaction temperature to 120°C, and the reaction time to 10h. The final product was washed several times with water and alcohol, filtered and dried at 60°C to obtain a composite precursor of cobalt hydroxide and nickel foam (precursor 1); 0.5 mmol of copper nitrate trihydrate was dissolved in 15 mL of DMF to form a reaction solution A , 1mmol 2-aminoterephthalic acid was dissolved in 15mL DMF to form reaction solution B, reaction solution B was added to reaction solution A, and after magnetic stirring for 15 minutes, it was transferred to a polytetrafluoroethylene liner, followed by the above preparation to obtain hydrogen The composite layer of cobalt oxide and nickel foam (precursor 1) was sealed and placed in a stainless steel autoclave and reacted at 120°C for 24 hou...

Embodiment 3

[0096] Compared with Example 2, the main difference is that the calcination temperature is changed to 500°C, as follows:

[0097] Add 3mmol of urea to 80ml of 1mM cobalt chloride solution, stir until completely dissolved into a transparent solution, add a piece of clear and clean nickel foam, package it in a reaction kettle, set the reaction temperature to 120°C, and the reaction time to 10h. The final product was washed several times with water and alcohol, and dried at 60°C after filtration to obtain a composite precursor of cobalt hydroxide and nickel foam; 0.5 mmol of copper nitrate trihydrate was dissolved in 15 mL of DMF to form a reaction solution A, and 1 mmol of 2- Aminoterephthalic acid was dissolved in 15mL DMF to form reaction solution B, and reaction solution B was added to reaction solution A. After magnetic stirring for 15 minutes, it was transferred to a polytetrafluoroethylene liner, and then cobalt hydroxide and nickel foam were prepared as above The composit...

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Abstract

The invention relates to electrochemical power sources and the field of electrochemical catalysis, and particularly relates to a transition metal nitride / carbon electrocatalyst. The transition metal nitride / carbon electrocatalyst comprises a substrate and a shell, the substrate is coated by the shell, and the shell comprises copper nitride and further comprises a carbon material or a nitrogen doped carbon material. The invention further provides a preparation method of the electrocatalyst, and the electrocatalyst is prepared by forming MOF of copper in advance, then further aminating and calcining through one step, and preparing the electrocatalyst. The processes of oxygen precipitation and hydrogen precipitation show the low overpotential in the alkaline environment, and the electrocatalyst can be used as a catalyst material of alkaline efficient electrolysed water.

Description

technical field [0001] The invention relates to the fields of chemical power sources and electrochemical catalysis, in particular to a preparation method and application of an alkaline high-efficiency transition metal nitride / carbon electrocatalyst. Background technique [0002] As a new type of energy storage device, alkaline electrolyzed water has attracted the attention of researchers at home and abroad in recent years because of its advantages such as high specific energy, low cost, environmental friendliness, and mechanical replacement. The alkaline electrolytic water device consists of three parts: catalyst anode, alkaline electrolyte, and catalyst cathode. During the reaction, the oxygen evolution reaction (OER) occurs at the anode, and the hydrogen evolution reaction (HER) occurs at the cathode. The OER process is relatively complicated. It is generally believed that the oxygen evolution reaction mainly has a four-electron process, that is, OH - Directly oxidized t...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/00C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/24B01J35/33Y02E60/36
Inventor 方静甘浪介亚菲覃富荣王梦然赖延清李劼
Owner CENT SOUTH UNIV
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