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Preparation method of full water electrolysis catalyst with heterojunction structure

A catalyst and heterojunction technology, applied in the field of nanomaterials, can solve the problems of low reserves, strict catalytic environment requirements, unstable catalysts, etc., to achieve improved stability, excellent total water splitting performance, excellent alkali resistance and stability Effect

Active Publication Date: 2020-02-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that the existing electrolytic water catalysts can only achieve hydrogen evolution or oxygen evolution single-function catalysis, and most electrocatalytic materials, such as platinum and other noble metals and their compounds, have the problems of low reserves and high prices, and some cheap electrocatalytic materials have great impact on Due to the harsh requirements of the catalytic environment and the instability of the catalyst, the present invention provides a method for preparing a catalyst for total water splitting with a heterojunction structure

Method used

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  • Preparation method of full water electrolysis catalyst with heterojunction structure
  • Preparation method of full water electrolysis catalyst with heterojunction structure
  • Preparation method of full water electrolysis catalyst with heterojunction structure

Examples

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Embodiment 1

[0054] A preparation method of a total water splitting catalyst with a heterojunction structure, the preparation method comprising the following preparation steps:

[0055] 1) Weigh 0.5g MoO 3 , 0.5g Mn(NO 3 ) 2 ·6H 2 O, 0.2248g Ni(NO 3 ) 2 ·6H 2 O and 0.475g 2-methylimidazole were dissolved in 50mL deionized water to prepare a precursor solution. The foamed nickel was placed in hydrofluoric acid, ethanol, and deionized water for ultrasonic cleaning for 5 minutes, and then the pretreated foamed nickel was Put it together with the precursor solution in the reactor for 120°C hydrothermal reaction for 8 hours, and obtain the trimetallic precursor after the hydrothermal reaction;

[0056] 2) After the trimetallic precursor was naturally cooled to room temperature, the trimetallic precursor was placed in a hydrogen / nitrogen gas mixture with a hydrogen content of 10% VOL, and the temperature was raised in one step at a heating rate of 10°C / min to a temperature of 280 °C in the...

Embodiment 2

[0073] Concrete steps are identical with embodiment 1, difference is: MoO 3 The dosage is 0.2768g, Mn(NO 3 ) 2 ·6H 2 O dosage is 0.1288g, Ni(NO 3 ) 2 ·6H 2 The amount of O was 0.0373 g, and the amount of 2-methylimidazole was 0.2503 g; the hydrothermal reaction temperature was 150° C., and the reaction time was 4 h. The same characterization and test as in Example 1 were performed on the total water splitting catalyst with a heterojunction structure prepared in Example 2, and the results showed that its microstructure was complete and its performance was stable.

Embodiment 3

[0075] Concrete steps are identical with embodiment 1, difference is: MoO 3 The dosage is 2.670g, Mn(NO 3 ) 2 ·6H 2 O dosage is 1.329g, Ni(NO 3 ) 2 ·6H 2 The amount of O was 0.5385 g, and the amount of 2-methylimidazole was 0.4105 g; the hydrothermal reaction temperature was 100° C., and the reaction time was 36 h.

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Abstract

The invention relates to the technical field of nano-materials, in particular to a preparation method of a full water electrolysis catalyst with a heterojunction structure. The preparation method includes: 1) preparing a precursor solution, and putting a pretreated conductive substrate into the precursor solution for hydrothermal reaction to obtain a trimetal precursor; and 2) placing the trimetalprecursor in a reducing atmosphere, carrying out first-step heating to a first-stage temperature and then carrying out heat preservation for a period of time, then carrying out second-step heating toa second-stage temperature, and then conducting heat preservation for a period of time, thus obtaining the full water electrolysis catalyst with a heterojunction structure. The preparation method isconcise and efficient, low in equipment requirement, and convenient to popularize and realize industrial production; meanwhile, the catalyst has the double functions of hydrogen evolution and oxygen evolution, can be directly used as a self-supporting electrode, and has wide universality; and the prepared full water electrolysis catalyst with a heterojunction structure has stable microstructure, homogeneous nano-structure size and uniform component distribution, and has good electro-catalytic performance and mechanical performance.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing a total water splitting catalyst with a heterojunction structure. Background technique [0002] Energy issues have always been widely concerned by the society. At present, non-renewable energy such as coal, oil, and natural gas are mainly used. These energy sources are non-renewable and seriously harmful to the environment, forcing people to look for a renewable energy with abundant reserves. new energy. [0003] As a renewable clean energy, hydrogen energy has become one of the new energy sources developed and utilized. Among the many hydrogen production methods, hydrogen production by electrolysis of water has become an important means to realize industrial and cheap production of hydrogen due to its high product purity and high conversion rate (close to 100%). However, the electrocatalytic reaction involves a multi-step proton-coupled electron tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/883B01J23/889C25B11/06C25B1/04
CPCB01J23/883B01J23/8892C25B11/04C25B1/04B01J35/33Y02E60/36
Inventor 曹澥宏尹瑞连刘文贤俞林海
Owner ZHEJIANG UNIV OF TECH
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