Self-supporting transitional metal sulfide catalyst and preparation methods and applications thereof

A technology of transition metals and transition metal elements, applied in the field of self-supporting transition metal sulfide catalysts and their preparation, can solve the problems of limited pH value and low catalytic activity

Inactive Publication Date: 2015-11-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0004] The present invention provides a self-supporting transition metal sulfide catalyst and its preparation method and application in order to solve the technical problem of low catalytic activity of existing catalysts or limited by pH value

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  • Self-supporting transitional metal sulfide catalyst and preparation methods and applications thereof
  • Self-supporting transitional metal sulfide catalyst and preparation methods and applications thereof
  • Self-supporting transitional metal sulfide catalyst and preparation methods and applications thereof

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[0023] The present invention also provides a preparation method of a self-supporting transition metal sulfide catalyst, the method comprising:

[0024] Step 1: mixing metal salts of transition metal elements and sulfur sources, or adding surfactants, catalyst carriers, and alkaline solutions to obtain mixed solutions;

[0025] Step 2: adding the transition metal conductive substrate into the mixed solution obtained in Step 1 for reaction to obtain a self-supporting transition metal sulfide catalyst.

[0026] According to the present invention, the metal salt of the transition metal element and the sulfur source are mixed, or a surfactant is added, or a catalyst carrier is added, or an alkaline solution is added, preferably dissolved in distilled water under the condition of magnetic stirring, to obtain a mixed solution;

[0027] The sulfur source is preferably thiourea, thioacetamide, cysteine ​​or sodium sulfide. The metal salt of the transition metal element is preferably o...

Embodiment 1

[0039] Weigh 1 mmol of zinc nitrate, 2 mmol of cobalt nitrate, 2 mmol of ammonium fluoride, and 35 milliliters of 3 mmol of thiourea in aqueous solution and mix to obtain a mixed solution; the titanium mesh is cleaned with dilute hydrochloric acid, ethanol, and deionized, and then Adding to the above mixed solution, reacting at 300° C. for 0.5 hour to obtain a zinc cobalt sulfur nanowire array.

[0040] figure 1 It is the scanning electron micrograph picture of the zinc-cobalt-sulfur nanowire array prepared in Example 1, wherein picture a is a scanning electron micrograph under a 10 μm scale, and figure b is a scanning electron micrograph under a 10 μm scale, which shows that the titanium mesh is The zinc-cobalt-sulfur nanowire array is completely covered, with a diameter of 80-200 nanometers and a length of 2-6 microns. figure 2 The (1 mole of potassium hydroxide, pH=14) polarization curve of the zinc-cobalt-sulfur nanowire array prepared in Example 1 under alkaline conditi...

Embodiment 2

[0042] Weigh 5mmol of nickel nitrate, 10mmol of cobalt nitrate, 4mmol of ammonium fluoride, and 35ml of 5mmol of cysteine ​​in water and mix to obtain a mixed solution; wash the titanium sheet with dilute hydrochloric acid, ethanol, and deionized , and then added to the above mixed solution, and reacted at 180° C. for 5 hours to obtain a nickel-cobalt-sulfur nanowire array.

[0043] The nickel-cobalt-sulfur nanowire array obtained in Example 2 was tested for hydrogen evolution performance, when j=10mA cm -2 The potential of the nickel-cobalt-sulfur nanowire catalyst electrode relative to the standard hydrogen electrode is 1.68 volts.

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Abstract

The present invention provides a self-supporting transitional metal sulfide catalyst and preparation methods and applications thereof, pertaining to the field of alkaline full electrolytic cell water decomposition. A preparation method of the catalyst comprises: mixing a metal salt of a transitional metal element with a sulfur source, and adding a surfactant, a catalyst carrier, and an alkaline solution to obtain a mixed solution; and then adding a transitional metal conductive substrate to the mixed solution to react to obtain a self-supporting transitional metal sulfide catalyst. Alternatively, a preparation method of the catalyst comprises: mixing a metal salt of a transitional metal element with a sulfur source, and a surfactant, a catalyst carrier, and an alkaline solution to obtain a mixed solution; and then with a transitional metal conductive substrate being used as a working electrode, performing electrodeposition in the obtained transitional metal sulfide electrolyte, to obtain a self-supporting transitional metal sulfide catalyst. The present invention also provides the self-supporting transitional metal sulfide catalyst prepared with the above two methods. The prepared sulfide catalyst, when applied in a battery, has excellent performance in electric hydrogen evolution and oxygen evolution.

Description

technical field [0001] The invention relates to the field of water decomposition in an alkaline full electrolytic cell, in particular to a self-supporting transition metal sulfide catalyst and its preparation method and application. Background technique [0002] In the 21st century, energy crisis and environmental pollution have become two very serious problems facing the world. Therefore, in order to realize the sustainable development of human beings, it is extremely urgent to develop clean and renewable energy. Hydrogen is a high combustion value, high efficiency and clean energy. However, the current production of hydrogen energy is mainly obtained by reforming coal and natural gas, which will inevitably increase the consumption of non-renewable energy and bring about environmental pollution problems. Hydrogen production by electrolysis of water is an important means to achieve industrialization and low-cost production of hydrogen. The use of solar energy for photolys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043C25D9/04C25B11/06
Inventor 孙旭平邢志财
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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