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Nickel manganese selenide heterojunction electrocatalyst as well as preparation method and application thereof

An electrocatalyst, nickel manganese oxide technology, applied in electrodes, electrolysis components, electrolysis process, etc., can solve the problems of cost and natural scarcity hindering application, hindering the development of electrolytic water hydrogen production, short service life, etc., to achieve good electrolysis. Water catalytic performance, excellent electrochemical activity, and the effect of low energy consumption

Active Publication Date: 2022-04-29
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common catalysts for HER and OER are composed of noble metals platinum, iridium, ruthenium and their alloys and compounds, but high cost and natural scarcity hinder their wider application. In recent years, with the development of the field of electrocatalysis, transition metal chalcogenides The emergence of compounds, nitrides, carbides, and phosphides has brought new opportunities in this field, but the existing electrocatalysts still have problems such as low catalytic activity, poor stability, and short service life, which hinder the electrolysis of water. development of hydrogen

Method used

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  • Nickel manganese selenide heterojunction electrocatalyst as well as preparation method and application thereof
  • Nickel manganese selenide heterojunction electrocatalyst as well as preparation method and application thereof
  • Nickel manganese selenide heterojunction electrocatalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0029] A nickel manganese selenide heterojunction electrocatalyst, the specific steps of its preparation method are as follows:

[0030] Dissolve 0.08mol of nickel chloride, 0.08mol of manganese nitrate, and 0.003mol of potassium persulfate in 300mL of deionized water, and stir for 10 minutes to obtain a mixed solution. 2 Carbon cloth (pre-placed in deionized water and ultrasonically treated to remove surface grease and impurities) was added to the mixed solution, stirred for 3 minutes, and then 4 mL of ammonia solution with a pH value of 8 was added dropwise to the solution at 15°C while stirring, and the dropwise addition was completed. Take it out after standing for 20min, put it into a tube furnace after drying, heat up to 300°C from room temperature with a heating rate of 5°C / min, and keep it warm for 30min to obtain a carbon cloth (500mg ), the prepared carbon cloth coated with layered nanosheets of nickel-manganese oxide was washed with deionized water and alcohol for 3...

Embodiment 2

[0037] A nickel manganese selenide heterojunction electrocatalyst, the specific steps of its preparation method are as follows:

[0038] Dissolve 0.08mol nickel chloride, 0.16mol manganese nitrate, and 0.003mol potassium persulfate in 300mL deionized water, stir for 10 minutes to obtain a mixed solution, and use ultrasonic treatment to remove 9cm of surface grease and impurities. 2Add carbon cloth into the mixed solution, stir for 3 minutes, then add 4 mL of ammonia solution with a pH value of 9 to the solution dropwise while stirring at 15°C, let it stand for 20 minutes after the addition, take it out, dry it and put it in a tube furnace, Raise the temperature from room temperature to 350°C at a rate of 5°C / min, and keep it warm for 30min to obtain a carbon cloth (700mg) coated with nickel-manganese oxide layered nanosheets, and wrap the prepared nickel-manganese oxide layered nanosheets The covered carbon cloth is washed with deionized water and alcohol for 3-5 times, put in...

Embodiment 3

[0040] A nickel manganese selenide heterojunction electrocatalyst, the specific steps of its preparation method are as follows:

[0041] Dissolve 0.08mol nickel chloride, 0.32mol manganese nitrate, and 0.003mol potassium persulfate in 300mL deionized water, stir for 10 minutes to obtain a mixed solution, and use ultrasonic treatment to remove 9cm of surface grease and impurities. 2 Carbon cloth was added to the mixed solution, stirred for 3 minutes, and then 4 mL of ammonia solution with a pH value of 8 was added dropwise to the solution while stirring at 15°C. Raise the temperature from room temperature to 400°C at a rate of 5°C / min, and keep it warm for 30min to obtain a carbon cloth (600mg) coated with nickel-manganese oxide layered nanosheets, and wrap the prepared nickel-manganese oxide layered nanosheets The covered carbon cloth is washed with deionized water and alcohol for 3-5 times, put into a blast drying oven at 60°C for drying, and then placed in the downstream of ...

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Abstract

The invention relates to a nickel manganese selenide heterojunction electrocatalyst and a preparation method and application thereof.The preparation method of the electrocatalyst comprises the following steps that 1, nickel salt and manganese salt are dissolved in deionized water, potassium persulfate is added, carbon cloth with the clean surface is immersed in the obtained mixed solution, a weakly alkaline solution is dropwise added, stirring is conducted, and the nickel manganese selenide heterojunction electrocatalyst is obtained; growing on the carbon cloth to obtain a layered nickel manganese hydroxide nanosheet; 2) calcining the carbon cloth for the first time to obtain a precursor nickel manganese oxide; and 3) placing the carbon cloth at the downstream of the tubular furnace, placing the selenium powder at the upstream of the tubular furnace, and carrying out secondary calcination to obtain the nickel manganese selenide heterojunction electrocatalyst. The nickel manganese selenide heterojunction electrocatalyst provided by the invention has excellent electrochemical activity, only an overpotential of 158mV is needed when the HER reaches the current density of 10mA cm <-2 >, only an overpotential of 422mV is needed when the OER reaches the current density of 50mA cm <-2 >, the water electrolysis efficiency is high, and the cycle stability is good.

Description

technical field [0001] The invention belongs to the technical field of production of hydrogen or hydrogen-containing mixed gas, and in particular relates to a nickel-manganese-selenide heterojunction electrocatalyst and a preparation method and application thereof. Background technique [0002] Hydrogen production by electrolysis of water, as the current mainstream green hydrogen production method, has received extensive attention in recent years due to its simple process and mature technology. The hydrogen evolution reaction (HER) at the cathode and the oxygen evolution reaction (OER) at the anode play an important role in the electrolytic conversion of water to hydrogen. The overpotential required for the reaction can be effectively reduced through the action of the electrocatalyst, thereby improving the efficiency of hydrogen production. Common catalysts for HER and OER are composed of noble metals platinum, iridium, ruthenium and their alloys and compounds, but high cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/04
CPCC25B11/091C25B1/04Y02E60/36
Inventor 彭祥李荣赖思帆徐炎武赵贵明
Owner WUHAN INSTITUTE OF TECHNOLOGY
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