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Iron and cobalt modified nickel phosphide nanosheet array and preparation method thereof

A nanosheet array, nickel phosphide technology, applied in nanotechnology, electrodes, electrolysis process, etc., can solve the problems of limited improvement of catalyst activity, high potential, and performance that cannot meet commercialization requirements, achieve excellent catalytic activity, improve The mass transfer process and preparation method are simple and effective

Active Publication Date: 2021-10-08
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its performance is still not up to commercial requirements, and some effective methods have been developed to enhance the OER activity of NiP, including strategies such as designing special nanostructures and doping heteroatoms.
However, most of the heteroatom doping strategies focus on a single metal modification, the catalyst activity is limited, and there are problems such as high overpotential.

Method used

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  • Iron and cobalt modified nickel phosphide nanosheet array and preparation method thereof
  • Iron and cobalt modified nickel phosphide nanosheet array and preparation method thereof
  • Iron and cobalt modified nickel phosphide nanosheet array and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Add 60mL deionized water to the solution containing 0.875g Ni(NO 3 ) 2 ·6H 2 O, 0.6g urea and 0.148g NH 4Stir in the beaker of F for 10 min until it dissolves completely. Put the obtained clarified solution into a 100mL polytetrafluoroethylene hydrothermal kettle liner, and place the foamed nickel (2cm×5cm) pretreated with dilute hydrochloric acid and ethanol obliquely in the hydrothermal kettle inner vessel and make it It was completely submerged in the solution, and after the hydrothermal kettle was sealed, it was heated in an oven set at 120°C for 6 hours. After the reaction is completed, cool to room temperature, open the hydrothermal kettle, take out the nickel foam with tweezers and rinse it with deionized water for about 2 minutes, and then dry it in an oven at 60°C for 2 hours to obtain the nickel hydroxide precursor grown on the nickel foam .

[0045] (2) In order to introduce Fe and Co elements, a secondary hydrothermal method is adopted. Add 0.2424g...

Embodiment 2

[0055] (1) Add 60mL deionized water to the solution containing 0.875g Ni(NO 3 ) 2 ·6H 2 O, 0.6g urea and 0.148g NH 4 Stir in the beaker of F for 10 min until it dissolves completely. Put the obtained clarified solution in a 100mL polytetrafluoroethylene hydrothermal kettle liner, and place the foamed nickel (2cm×5cm) pretreated with dilute hydrochloric acid and ethanol obliquely in the hydrothermal kettle liner and make it It was completely submerged in the solution, and after the hydrothermal kettle was sealed, it was heated in an oven set at 120°C for 6 hours. After the reaction is completed, cool to room temperature, open the hydrothermal kettle, take out the nickel foam with tweezers and rinse it with deionized water for about 2 minutes, and then dry it in an oven at 60°C for 2 hours to obtain nickel hydroxide grown on the nickel foam Precursor.

[0056] (2) In order to further introduce Fe and Co elements, a secondary hydrothermal method is adopted. Add 0.0808g Fe(N...

Embodiment 3

[0060] (1) Add 60mL deionized water to the solution containing 0.875g Ni(NO 3 ) 2 ·6H 2 O, 0.6g urea and 0.148g NH 4Stir in the beaker of F for 10 min until it dissolves completely. Put the obtained clarified solution into a 100mL polytetrafluoroethylene hydrothermal kettle liner, and place the foamed nickel (2cm×5cm) pretreated with dilute hydrochloric acid and ethanol obliquely in the hydrothermal kettle inner vessel and make it It was completely submerged in the solution, and after the hydrothermal kettle was sealed, it was heated in an oven set at 120°C for 6 hours. After the reaction is completed, cool to room temperature, open the hydrothermal kettle, take out the nickel foam with tweezers and rinse it with deionized water for about 2 minutes, and then dry it in an oven at 60°C for 2 hours to obtain nickel hydroxide grown on the nickel foam Precursor.

[0061] (2) In order to further introduce Fe and Co elements, a secondary hydrothermal method is adopted. Add 0.12...

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Abstract

The invention is applicable to the technical field of catalysts for electrolyzing sea water to generate oxygen, and provides an iron and cobalt modified nickel phosphide nanosheet array and a preparation method thereof. The material is the iron and cobalt modified nickel phosphide nanosheet array growing on a foamed nickel substrate and coexisting with an amorphous phase and a crystal phase, the atom content of iron is 1.62-3.09%, the atom content of cobalt is 0.65-1.34%, and the atomic ratio of iron to cobalt is 2: 1-4: 1; the iron and cobalt modified nickel phosphide nanosheet array is prepared by adopting a two-step hydrothermal method and a vapor deposition method, and the method comprises the following steps: firstly, preparing a nickel hydroxide nanosheet by adopting a first-step hydrothermal method, and then modifying iron and cobalt into the nickel hydroxide nanosheet array by adopting a second-step hydrothermal method; and secondly, preparing the iron and cobalt modified nickel phosphide nanosheet array by adopting a one-step vapor deposition method. The iron and cobalt modified nickel phosphide nanosheet array provided by the invention is used as a working electrode for electrolyzing water and electrolyzing seawater for oxygen evolution, and shows excellent catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of electrolytic seawater oxygen production catalysts, and in particular relates to an iron and cobalt-modified nickel phosphide nanosheet array and a preparation method thereof. Background technique [0002] Water electrolysis to produce hydrogen is a sustainable and environmentally friendly energy conversion technology that can reduce excessive consumption of fossil fuels. In general, water electrolysis includes two half-reactions: hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), in which OER has a slower reaction rate kinetically and is the rate-determining step for efficiency. If the all-electrolyzed water is to be more efficient and stable, it is imminent to seek energy-saving, economical and catalytically active OER catalysts. [0003] On the other hand, current electrocatalysis research mainly focuses on the analysis of fresh water samples, however, fresh water resources are limi...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B1/04B82Y40/00
CPCC25B11/04C25B1/04B82Y40/00Y02E60/36
Inventor 余颖段丁槊黄楚强邱明强
Owner HUAZHONG NORMAL UNIV