Hollow iron-nickel nitride catalyst, preparation method and all-water electrolysis application thereof

A technology of nitrides and catalysts, applied in the field of hollow iron-nickel nitride catalysts and preparations, can solve the problems of reducing the utilization rate of catalyst materials, catalytic activity, affecting the full exposure of active sites, and easy agglomeration of nanostructures, which is beneficial to batch preparation , low cost, simple operation

Pending Publication Date: 2021-01-12
YANGZHOU UNIV
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  • Claims
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Problems solved by technology

However, for nickel-iron nitride-based powder catalysts, the nanostructures are easy to agglomerate during the synthesis process, which affects the full exposure of

Method used

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  • Hollow iron-nickel nitride catalyst, preparation method and all-water electrolysis application thereof
  • Hollow iron-nickel nitride catalyst, preparation method and all-water electrolysis application thereof
  • Hollow iron-nickel nitride catalyst, preparation method and all-water electrolysis application thereof

Examples

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Example Embodiment

[0030]Example 1

[0031]Preparation of hollow iron-nickel nitride catalyst: select granular 100-300 nm iron-nickel alloy nanoparticles, in which the atomic ratio of iron and nickel is 1:3, place them in an air atmosphere, heat to 400°C, and hold for 2 hours. Hollow iron-nickel alloy nanoparticles are obtained, and the hollow iron-nickel alloy nanoparticles are further placed in an ammonia atmosphere and kept at 500°C for 3 hours to obtain hollow iron-nickel nitride nanoparticles (FeNi3N) Catalyst. For its morphological structure and crystal structure, seefigure 1 withfigure 2 .

[0032]The hollow iron-nickel nitride nanoparticles obtained in Example 1 (FeNi3N) The catalyst is used in the hydroelectric analysis of oxygen and hydrogen evolution reactions. The specific process is: take 5 mg of catalyst and disperse in 1 ml of ethanol and 50 μl of Nafion solution to make a well-dispersed catalyst ink, and drop it on the surface of the glassy carbon electrode Add 5 μl of catalyst ink and use i...

Example Embodiment

[0033]Example 2

[0034]Preparation of hollow iron-nickel nitride nanoparticles: select granular 100-300 nm iron-nickel alloy nanoparticles, in which the atomic ratio of iron and nickel is 1:3, place them in an air atmosphere, heat to 450°C, and hold for 2 hours , To obtain hollow iron-nickel alloy nanoparticles. Furthermore, the hollow iron-nickel alloy nanoparticles were placed in an ammonia atmosphere and kept at 450°C for 3 hours to obtain hollow iron-nickel nitride nanoparticles (FeNi3N) Catalyst.

Example Embodiment

[0035]Example 3

[0036]Preparation of hollow iron-nickel nitride nanoparticles: select granular 100-300 nm iron-nickel alloy nanoparticles, in which the atomic ratio of iron and nickel is 1:3, place them in an air atmosphere, heat to 400°C, and hold for 2 hours , To obtain hollow iron-nickel alloy nanoparticles. Furthermore, the hollow iron-nickel alloy nanoparticles were placed in an ammonia atmosphere and kept at 400°C for 3 hours to obtain hollow iron-nickel nitride nanoparticles (FeNi3N) Catalyst.

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Abstract

The invention discloses a hollow iron-nickel nitride catalyst as well as a preparation method and an all-water electrolysis application thereof. The preparation method comprises the following steps: selecting iron-nickel alloy nanoparticles with the particle size of 100-300 nm, wherein the ratio of iron atoms to nickel atoms is 1:3; and using a Kirkendall effect to conduct low-temperature oxidation etching to synthesize hollow iron-nickel-based nanoparticles, conducting low-temperature nitriding treatment to obtain the hollow iron-nickel nitride catalyst. The catalyst is used in full-hydrolysis cathode hydrogen precipitation and anode oxygen precipitation reactions, and shows better electrocatalytic activity compared with an iron-nickel nitride powder material. The synthesis method is simple and low in cost, the full-water electrolysis catalytic activity of the hollow iron-nickel nitride catalyst is higher, and the hollow iron-nickel nitride catalyst is suitable for large-batch production.

Description

Technical field[0001]The invention belongs to the technical field of electrocatalytic water decomposition, and relates to a hollow iron-nickel nitride catalyst and a preparation method and its full-water electrolysis application.Background technique[0002]Iron-nickel-based compounds have been extensively studied in the field of energy electrocatalysis, especially in the field of water splitting; in electrocatalytic water splitting, it has outstanding water electrolysis performance and low price characteristics, showing good application value. Among the iron-nickel-based compounds, iron-nickel nitride is an intermetallic compound, which has good electrical conductivity and resistance to electrochemical corrosion. It exhibits good activity in electrocatalytic water splitting and has attracted much attention. For example, the layered structure Ni3FeN nitride, in the oxygen precipitation reaction, up to 10 mA cm-2At this time, only 355 mV of overpotential is required (Nano Energy 2017, 3...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B1/04
CPCB01J35/0033B01J27/24C25B1/04Y02E60/36
Inventor 冯立纲刘宗李东泽
Owner YANGZHOU UNIV
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