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Defect-rich Fe2O3-FeF2 nano porous film, preparation method and application thereof

A fe2o3-fef2, nano-porous technology, applied in chemical instruments and methods, catalyst activation/preparation, electrodes, etc., can solve the problems of complex preparation process, long preparation cycle, high reaction temperature, etc., and achieve high preparation efficiency and short preparation cycle , the effect of high degree of crystallization

Active Publication Date: 2018-03-16
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems of complex preparation process, high reaction temperature, long preparation cycle and high cost of existing hydrogen evolution and oxygen evolution dual-functional electrocatalysts, and to provide a defect-rich Fe 2 o 3 -FeF 2 Nanoporous film, preparation method and application thereof

Method used

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  • Defect-rich Fe2O3-FeF2 nano porous film, preparation method and application thereof
  • Defect-rich Fe2O3-FeF2 nano porous film, preparation method and application thereof
  • Defect-rich Fe2O3-FeF2 nano porous film, preparation method and application thereof

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Embodiment 1

[0034] A kind of defect-rich Fe in this embodiment 2 o 3 -FeF 2 nanoporous films, the defect-rich Fe 2 o 3 -FeF 2 Nanoporous film based on iron foil, Fe 2 o 3 and FeF 2 grown on iron foil, and the defect-rich Fe 2 o 3 -FeF 2 The nanoporous film has a pore size of 40 nm.

[0035] The defect-rich Fe in the above examples 2 o 3 -FeF 2 The preparation method of nanoporous film, comprises the following steps:

[0036] (1) Put the iron foil in isopropanol and acetone in turn for ultrasonic cleaning, and dry it under nitrogen;

[0037] (2) Anodic oxidation: use the iron foil dried in step (1) as an anode, and another platinum sheet as a counter electrode to contain 0.1MNH 4 F. The ethylene glycol solution of 1.0M deionized water is used as the electrolyte to form a two-electrode system. Under a constant voltage of 35V, anodic oxidation treatment is carried out for 40 minutes to obtain a porous iron oxide film;

[0038] (3) CVD fluorination reaction: under the conditio...

Embodiment 2

[0041] A kind of defect-rich Fe in this embodiment 2 o 3 -FeF 2 nanoporous films, the defect-rich Fe 2 o 3 -FeF 2 Nanoporous film based on iron foil, Fe 2 o 3 and FeF 2 grown on iron foil, and the defect-rich Fe 2 o 3 -FeF 2 The nanoporous film has a pore size of 45 nm.

[0042] The defect-rich Fe in the above examples 2 o 3 -FeF 2 The preparation method of nanoporous film, comprises the following steps:

[0043] (1) Put the iron foil in isopropanol and acetone in turn for ultrasonic cleaning, and dry it under nitrogen;

[0044] (2) Anodic oxidation: use the iron foil dried in step (1) as an anode, and another platinum sheet as a counter electrode to contain 0.095M NH 4 F. The ethylene glycol solution of 1.0M deionized water is used as the electrolyte to form a two-electrode system. Under a constant voltage of 40V, anodic oxidation treatment is carried out for 40min to obtain a porous iron oxide film;

[0045] (3) CVD fluorination reaction: under the conditions...

Embodiment 3

[0048] A kind of defect-rich Fe in this embodiment 2 o 3 -FeF 2 nanoporous films, the defect-rich Fe 2 o 3 -FeF 2 Nanoporous film based on iron foil, Fe 2 o 3 and FeF 2 grown on iron foil, and the defect-rich Fe 2 o 3 -FeF 2 The nanoporous film has a pore size of 48 nm.

[0049] A kind of defect-rich Fe in the above-mentioned embodiment 2 o 3 -FeF 2 The preparation method of nanoporous film, comprises the following steps:

[0050] (1) Put the iron foil in isopropanol and acetone in turn for ultrasonic cleaning, and dry it under nitrogen;

[0051] (2) Anodic oxidation: use the iron foil dried in step (1) as an anode, and take another platinum sheet as a counter electrode to contain 0.15M NH 4 F. The ethylene glycol solution of 1.1M deionized water is used as the electrolyte to form a two-electrode system. Under a constant voltage of 42V, anodic oxidation treatment is carried out for 40 minutes to obtain a porous iron oxide film;

[0052] (3) CVD fluorination rea...

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Abstract

The invention relates to a defect-rich Fe2O3-FeF2 nano porous film, a preparation method and application thereof, and aims to solve the technical problems of complex preparation process, high reactiontemperature, long preparation cycle and high cost in existing hydrogen and oxygen evolution bifunctional electrocatalysts. The technical scheme adopted by the invention includes: firstly conducting anodic oxidation treatment on an ordinary iron foil, then using NH4F as the fluorine source, in an argon atmosphere, carrying out fluorination reaction on the iron foil subjected to anodic oxidation treatment by chemical vapor deposition (CVD) method, and performing natural cooling to room temperature, thus obtaining the Fe2O3-FeF2 nano porous film. According to the invention, the preparation process is simple, only needs anodic oxidation equipment and a CVD furnace, and can complete preparation of the Fe2O3-FeF2 composite nano porous film without special atmosphere and pressure environment, and the obtained Fe2O3-FeF2 nano porous film contains FeF2 and Fe2O3 phases, is rich in defects, and has the advantages of high electrocatalytic hydrogen and oxygen evolution activity, low initial potential, large electric current density, stable performance and the like.

Description

technical field [0001] The invention belongs to the field of iron-based nanoporous film materials, in particular to a defect-rich Fe 2 o 3 -FeF 2 Nanoporous films, preparation methods and applications. Background technique [0002] With the consumption of non-renewable resources such as fossil fuels and the increasingly serious environmental problems, the development of clean and sustainable new energy sources has attracted widespread attention from all over the world. Hydrogen energy has the advantages of high combustion calorific value, high thermal efficiency, high energy density, and zero emissions, and is considered to be one of the clean energy sources most likely to replace fossil fuels. At present, there are three main technologies for the industrial production of hydrogen: methane steam reforming, coal gasification, and electrolysis of water to produce hydrogen. However, the first two hydrogen production technologies based on fossil fuels will be accompanied by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/128B01J35/02B01J35/10B01J37/26B01J37/34C25B1/04C25B11/06B01J35/00
CPCC25B1/04C25B11/04B01J27/128B01J37/26B01J37/348B01J35/33B01J35/40B01J35/647Y02E60/36
Inventor 范修军王娟娟张献明
Owner SHANXI UNIV
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