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A nanoporous Ni-Fe bimetallic layered hydroxide electrocatalytic material for oxygen evolution and its preparation method and application

A bimetallic layered, hydroxide-electric technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of reducing the binding force between the catalyst and the substrate, Difficult to large-scale industrial production, complex process and other issues, to achieve good oxygen evolution catalytic activity, good stability, simple process effect

Active Publication Date: 2020-01-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above preparation method has made great progress in the electrocatalytic activity of oxygen evolution, there are still defects such as complex process, high toxicity and easy residue of the used drugs, which are difficult to large-scale industrial production, or need to use additives and Conductive agent, which reduces the binding force between the catalyst and the substrate, resulting in a decrease in its stability

Method used

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  • A nanoporous Ni-Fe bimetallic layered hydroxide electrocatalytic material for oxygen evolution and its preparation method and application
  • A nanoporous Ni-Fe bimetallic layered hydroxide electrocatalytic material for oxygen evolution and its preparation method and application
  • A nanoporous Ni-Fe bimetallic layered hydroxide electrocatalytic material for oxygen evolution and its preparation method and application

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Embodiment 1

[0037] The preparation method of the nanoporous Ni-Fe-LDH electrocatalytic material for oxygen evolution of the present embodiment comprises the following steps:

[0038] (1) Sample preparation: A Ni-Fe alloy sheet with a thickness of 0.2mm and a composition of 79wt% Ni, 18wt% Fe, and 3% impurity elements was used as the base metal, and cut into a rectangle of 3.5cm×0.5cm, among which, The upper part with a length of 1.5cm is the clamping part, which is used to connect with the fixture, and the lower part with a length of 2cm is the actual use part, which is immersed in the electrolyte to participate in the anodic oxidation reaction.

[0039] (2) Sample cleaning: Use acetone, isopropanol and alcohol to remove the oil stain and oxide layer on the surface of the Ni-Fe alloy sheet in an ultrasonic environment. Ultrasonic cleaning in acetone and isopropanol for 20 minutes, then ultrasonic cleaning in alcohol for 20 minutes; after ultrasonic cleaning, dry it for later use.

[0040...

Embodiment 2

[0052] The preparation method of the nanoporous Ni-Fe-LDH electrocatalytic material for oxygen evolution of the present embodiment comprises the following steps:

[0053] (1) Sample preparation: the same as step (1) of Example 1.

[0054] (2) Sample cleaning: the same as step (2) of Example 1.

[0055] (3) Anodizing: add ammonium fluoride, water, ethylene glycol and phosphoric acid to the container to form an electrolyte, where the concentrations of ammonium fluoride, water, ethylene glycol and phosphoric acid in the electrolyte are 0.5wt% and 10wt% respectively , 40wt%, 49.5wt%, fix one end of the cleaned Ni-Fe alloy sheet on the anode fixture, and immerse the other end in the electrolyte for anodization. During the anodization process, the temperature of the electrolyte is kept at 20°C. CHI 660D Electrochemical Workstation 1 produced by Chenhua Instrument Co., Ltd., such as figure 1 As shown, a three-electrode system is adopted, with Ni-Fe alloy sheet 2 as the working elec...

Embodiment 3

[0061] (1) Sample preparation: the same as step (1) of Example 1.

[0062] (2) Sample cleaning: the same as step (2) of Example 1.

[0063] (3) Anodizing: add ammonium fluoride, water, ethylene glycol and phosphoric acid to the container to form an electrolyte, wherein the concentrations of ammonium fluoride, water, ethylene glycol and phosphoric acid in the electrolyte are 3wt%, 25wt%, 33wt%, 39wt%, one end of the cleaned Ni-Fe alloy sheet is fixed on the anode fixture, and the other end is immersed in the electrolyte for anodization. During the anodization process, the temperature of the electrolyte is kept at 20°C. CHI 660D Electrochemical Workstation 1 produced by Hua Instrument Co., Ltd., such as figure 1 As shown, a three-electrode system is adopted, with Ni-Fe alloy sheet 2 as the working electrode, pure platinum sheet 3 as the counter electrode, and saturated calomel electrode 4 (SCE) as the reference electrode. The speed is increased to 7.5V, and then constant volta...

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Abstract

The invention discloses a nano-porous Ni-Fe double-metal layer laminated hydroxide electric catalytic material for oxygen evolution and a preparation method and application of the electric catalytic material and belongs to the field of novel material techniques and electric catalysis. The method comprises the following steps: (1) soaking a Ni-Fe alloy substrate into electrolyte, wherein the electrolyte comprises 0.5-3wt% of NH4F, 10-25wt% of H2O, 25-40wt% of ethylene glycol and 32-60wt% of phosphoric acid; (2) performing constant-pressure anode oxidation treatment on the Ni-Fe alloy substratesoaked into the electrolyte; (3) performing alkali hydrothermal treatment on a sample treated in the step (2), cleaning, and performing blow drying, thereby obtaining the nano-porous Ni-Fe double-metal layer laminated hydroxide electric catalytic material for oxygen evolution. The electric catalytic material disclosed by the invention is relatively high in catalytic activity, good in electrochemical stability, simple in preparation process, high in efficiency and low in cost.

Description

technical field [0001] The invention relates to the field of new material technology and electrocatalysis, in particular to a nanoporous Ni-Fe bimetallic layered hydroxide electrocatalysis material for oxygen evolution and its preparation method and application. Background technique [0002] In recent years, alkaline electrolyzed water technology is considered to be the most promising and sustainable hydrogen production method due to the advantages of wide source of raw materials, simple process, reliable technology, easy access to high-purity hydrogen, and no pollution. research and attention. However, traditional IrO 2 / C, RuO 2 Due to the disadvantages of high economic cost and limited reserves of noble metal catalysts, the industrial application of water electrolysis technology is greatly limited. However, transition metals, especially Ni, have attracted extensive attention of researchers because of their high oxygen evolution performance, low price and good stability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755C25B1/04C25B11/03C25B11/04
CPCB01J23/755B01J35/0033B01J35/023C25B1/04C25B11/031C25B11/069Y02E60/36
Inventor 张果戈李孔哲徐小兵李文芳
Owner SOUTH CHINA UNIV OF TECH
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