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Nickel/molybdenum selenide difunctional composite catalyst and preparation method and application thereof

A technology of composite catalysts and selenides, applied in electrolytic components, electrolytic inorganic material coatings, electrolytic processes, etc., can solve the problems of difficult control of material morphology and influence on material specific surface area, and achieve optimal adsorption and desorption free energy, high Effect of OER performance, large electrochemical active surface area

Inactive Publication Date: 2021-12-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with other methods, the morphology of the material is often difficult to control when preparing nickel-based catalysts by electrodeposition, showing more inert electrochemical properties.
Therefore, by overcoming the shortcomings of this method, the catalytic performance of nickel-based materials may be improved, since these shortcomings directly affect the specific surface area of ​​the material.

Method used

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  • Nickel/molybdenum selenide difunctional composite catalyst and preparation method and application thereof
  • Nickel/molybdenum selenide difunctional composite catalyst and preparation method and application thereof
  • Nickel/molybdenum selenide difunctional composite catalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0043] A preparation method of a nickel / molybdenum selenide bifunctional composite catalyst, specifically comprising the steps of:

[0044] (1) Cleaning of foamed nickel: Use dilute hydrochloric acid with a concentration of 6mol / L to ultrasonically wash the foamed nickel at room temperature in an ultrasonic machine for 15 minutes, then use deionized water and absolute ethanol to ultrasonically wash the foam at room temperature in an ultrasonic machine in sequence Nickel for 10 minutes, in which the length and width of nickel foam are fixed at 1 cm, and finally dried in vacuum at 65°C for 20 minutes;

[0045] (2) Preparation of electrolyte: 1mmol selenium dioxide, 2.5mmol nickel acetate and 5mmol sodium molybdate were dissolved in 50mL deionized water to prepare electrolyte, which was designed to be saturated in the presence of a small amount of solid reagent precipitation;

[0046] (3) The process of electrodeposition: in the standard three-electrode system, with graphite rod ...

Embodiment 2

[0049] The difference between this embodiment and embodiment 1 is that sodium molybdate is not added, and other parameters and specific implementation steps are the same as in embodiment 1.

Embodiment 3

[0051] The difference between this embodiment and embodiment 1 is that nickel acetate is not added, and other parameters and specific implementation steps are the same as embodiment 1.

[0052] figure 1 For the preparation of Ni 3 Se 2 / MoSe 2 process flow chart.

[0053] The above steps 1 to 3 can be prepared to obtain Ni 3 Se 2 / MoSe 2 . As a comparison, step 2 does not add sodium molybdate, Ni can be obtained 3 Se 2 ; And step 2 does not add nickel acetate, MoSe can be obtained 2 .

[0054] figure 2 For the Ni prepared in embodiment 1, embodiment 2, embodiment 3 3 Se 2 / MoSe 2 、Ni 3 Se 2 、MoSe 2 The XRD figure of, can find out from the figure that the Ni prepared by the present invention 3 Se 2 / MoSe 2 、Ni 3 Se 2 They are all pure phases, and the two relatively large peaks belong to the peaks of the base nickel foam. On the other hand, it may be due to Ni 3 Se 2 / MoSe 2 Medium MoSe 2 The content is low or its crystallinity is poor, in Ni 3 Se 2...

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Abstract

The invention discloses a nickel / molybdenum selenide bifunctional composite catalyst and a preparation method and application thereof, and belongs to the technical field of new energy materials and electrochemical energy storage. Foamed nickel is washed with diluted hydrochloric acid, deionized water and absolute ethyl alcohol, then selenium dioxide, sodium molybdate and nickel acetate are dissolved in the deionized water, and a precursor sample is prepared in a standard three-electrode system by taking a graphite rod as a counter electrode, taking the foamed nickel as a working electrode and taking silver / silver chloride as a reference electrode through a simple electro-deposition method; and after electro-deposition is finished, the prepared precursor sample is washed with the deionized water and is dried, and the nickel / molybdenum selenide bifunctional composite catalyst is obtained. The low-cost and efficient nickel / molybdenum selenide bifunctional electrocatalyst is prepared through simple electrodeposition, and the material shows low overpotential and good stability in a hydrogen evolution reaction and an oxygen evolution reaction and is suitable for application and popularization.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and electrochemical energy storage, relates to a preparation method of an inorganic nanometer catalytic material, and specifically discloses a preparation method of a nickel / molybdenum selenide bifunctional composite catalyst. Background technique [0002] In response to the world's energy crisis and climate change, hydrogen production from water splitting is considered to be an effective strategy to develop clean and sustainable new energy, and the field of hydrogen production has received more and more attention from all over the world. However, the efficiency of hydrogen production from water splitting is quite low at present, and usually higher voltage is required to achieve a current density of 10 mA cm -2 , far greater than the theoretical value of 1.23V. Generally, the water splitting reaction is divided into the hydrogen evolution reaction (HER) occurring at the cathode and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/04C25D5/40C25B11/091C25B11/054C25B11/061C25B1/04
CPCC25D9/04C25D5/40C25B11/091C25B11/061C25B11/054C25B1/04Y02E60/36
Inventor 王春栋谷雨
Owner HUAZHONG UNIV OF SCI & TECH
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