Two-dimensional Ni-Ir porous nanosheet and preparation method and application thereof

A nanosheet, ni-ir technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems that it is difficult to obtain high-purity hydrogen, hinder large-scale commercial application, limit the large-scale application of hydrogen energy, and achieve excellent The effect of electrocatalytic activity, structural stability, and many active sites

Active Publication Date: 2021-05-14
NANJING NORMAL UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, hydrogen is mainly separated from fossil fuels such as natural gas and coalbed methane. It is difficult to obtain high-purity hydrogen, which greatly limits the large-scale application of hydrogen energy.
The water-splitting reaction consisting of hydrogen evolution and oxygen evolution half-reaction serves as a sustainable source of hydrogen, an attractive energy carrier that can be used to generate clean electricity in fuel cells, whereas the oxygen evolution half-reaction is electrolytic The rate-determining step of water reaction, its large overpotential seriously hinders large-scale commercial application

Method used

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  • Two-dimensional Ni-Ir porous nanosheet and preparation method and application thereof
  • Two-dimensional Ni-Ir porous nanosheet and preparation method and application thereof
  • Two-dimensional Ni-Ir porous nanosheet and preparation method and application thereof

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Effect test

Embodiment 1

[0042] A preparation method of two-dimensional Ni-Ir porous nanosheets, comprising the following steps:

[0043] 1) Preparation of Hoffman-type complex precursors with two-dimensional layered structure

[0044] Use nickel potassium cyanide and iridium chloride as precursors, heat in an oil bath at 70°C, and keep the reaction at this temperature for 30 minutes. After the reaction system is centrifuged, the solid is washed 3 times with water to obtain a two-dimensional layered structure. The precursor of the Hoffman type complex;

[0045] 2) Preparation of two-dimensional Ni-Ir porous nanosheets

[0046] The dried two-dimensional layered Hoffman-type complex precursor was placed in a tube furnace, and the temperature was programmed to rise to 250 °C for calcination and oxidation for 2 h; after cooling to room temperature, the obtained material was loaded on carbon cloth and passed through a specific Two-dimensional Ni-Ir porous nanosheets were obtained by reduction under the e...

Embodiment 2

[0049] A preparation method of two-dimensional Ni-Ir porous nanosheets, comprising the following steps:

[0050] 1) Preparation of Hoffman-type complex precursors with two-dimensional layered structure

[0051] Use nickel potassium cyanide and iridium chloride as precursors, heat in an oil bath at 80°C, and keep the reaction at this temperature for 30 minutes. After the reaction system is centrifuged, the solid is washed several times with water to obtain a two-dimensional layered structure. The precursor of the Hoffman type complex;

[0052] 2) Preparation of two-dimensional Ni-Ir porous nanosheets

[0053] The dried two-dimensional layered Hoffman-type complex precursor was placed in a tube furnace, and the temperature was programmed to rise to 250 °C for calcination and oxidation for 2 h; after cooling to room temperature, the obtained material was loaded on carbon cloth and passed through a specific Two-dimensional Ni-Ir porous nanosheets were obtained by reduction under...

Embodiment 3

[0056] A preparation method of two-dimensional Ni-Ir porous nanosheets, comprising the following steps:

[0057] 1) Preparation of Hoffman-type complex precursors with two-dimensional layered structure

[0058] Use nickel potassium cyanide and iridium chloride as precursors, heat the oil bath at 90°C, and keep the reaction at this temperature for 30 minutes. After the reaction system is centrifuged, the solid is washed several times with water to obtain a two-dimensional layered structure. The precursor of the Hoffman type complex;

[0059] 2) Preparation of two-dimensional Ni-Ir porous nanosheets

[0060] The dried two-dimensional layered Hoffman-type complex precursor was placed in a tube furnace, and the temperature was programmed to rise to 250 °C for calcination and oxidation for 2 h; after cooling to room temperature, the obtained material was supported on carbon cloth and passed through Two-dimensional Ni-Ir porous nanosheets were obtained by reduction under a specifi...

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Abstract

The invention discloses a two-dimensional Ni-Ir porous nanosheet and a preparation method and application thereof. The preparation method comprises the steps that nickel cyanide and iridium salt serve as precursors, a Hoffman type complex precursor of a two-dimensional layered structure is prepared through oil bath heating, and after high-temperature calcination oxidation, the Hoffman type complex precursor is reduced under a specific electrochemical window to obtain the two-dimensional Ni-Ir porous nanosheet. Compared with a traditional preparation method, the method disclosed by the invention is simple in process operation, heteroions in the solution can be removed by using deionized water, greenhouse gases cannot be released in the calcination oxidation process, and the electrochemical reduction process is clean, environment-friendly and pollution-free. The two-dimensional Ni-Ir porous nanosheet prepared by the method is extremely high in purity, has the advantages of large specific surface area, multiple active sites, good electron conductivity, stable structure and the like, and shows excellent electrocatalytic activity on oxygen evolution.

Description

technical field [0001] The invention relates to a two-dimensional Ni-Ir porous nanosheet and its preparation method and application, belonging to the technical field of Ni-Ir porous sheet nanoflowers. Background technique [0002] Environmental pollution and energy crisis are becoming more and more serious, and the remarkable advantages of high energy efficiency and low emission of fuel cell technology have attracted widespread attention. At present, hydrogen is mainly separated from fossil fuels such as natural gas and coalbed methane. It is difficult to obtain high-purity hydrogen, which greatly limits the large-scale application of hydrogen energy. The water-splitting reaction consisting of hydrogen evolution and oxygen evolution half-reaction serves as a sustainable source of hydrogen, an attractive energy carrier that can be used to generate clean electricity in fuel cells, whereas the oxygen evolution half-reaction is electrolytic The rate-determining step of water re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/075C25B11/054C25B1/04
CPCC25B11/04C25B1/04Y02E60/36
Inventor 唐亚文刘启成刘嘉琪周心怡徐林孙冬梅邱晓雨
Owner NANJING NORMAL UNIVERSITY
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