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MoS2/CoS2 composite water-splitting hydrogen-production low-overpotential electrocatalyst and sulfidation preparation method thereof

An electrocatalyst and overpotential technology, applied in physical/chemical process catalysts, chemical instruments and methods, electrolysis processes, etc., can solve problems such as high overpotential and energy waste

Active Publication Date: 2017-05-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the overpotential of non-precious metal electrocatalysts in the prior art is too high and the energy is wasted seriously, the present invention has carried out in-depth research on the mechanism of hydrogen production by electrocatalytic cracking of water, and completed the invention

Method used

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  • MoS2/CoS2 composite water-splitting hydrogen-production low-overpotential electrocatalyst and sulfidation preparation method thereof
  • MoS2/CoS2 composite water-splitting hydrogen-production low-overpotential electrocatalyst and sulfidation preparation method thereof
  • MoS2/CoS2 composite water-splitting hydrogen-production low-overpotential electrocatalyst and sulfidation preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take 0.291 gram of cobalt nitrate hexahydrate solid particles, add 15 milliliters of deionized water in the reaction vessel and stir for 10 minutes to make it dissolve completely;

[0023] (2) Get 0.242 grams of sodium molybdate dihydrate solid particles in another reaction vessel, then add 15 milliliters of deionized water and stir for 10 minutes until sodium molybdate dihydrate is completely dissolved;

[0024] (3) Mix the solutions in step (1) and step (2), and then stir for 1.5 hours;

[0025] (4) the solution in the step (3) is transferred in the reactor of 100 milliliters with stainless steel substrate, then this reactor is put into the baking oven of the electric blast that has been warming up to 140 degrees Celsius in advance and keeps 12 hours, then When the temperature of the reaction kettle drops to room temperature, pour out the supernatant in the reaction kettle, wash the substrate 4 times with deionized water, and wash 3 times with absolute ethanol, an...

Embodiment 2

[0030] (1) Get 0.291 gram of cobalt nitrate hexahydrate solid particles and 0.121 gram of urea in the reaction vessel, add 30 milliliters of deionized water and stir for 30 minutes to dissolve the reactants completely;

[0031] (2) the solution in the step (1) is transferred in the reactor of 100 milliliters with stainless steel substrate, then this reactor is put into the baking oven of the electric blast that has been warming up to 140 degrees Celsius in advance and keeps 12 hours, then When the temperature of the reaction kettle drops to room temperature, the supernatant in the reaction kettle is poured out, the substrate is washed 4 times with deionized water, and 3 times with absolute ethanol, and then the washed product is placed in an electric blast at 80 degrees Celsius. Drying in the drying box for 24 hours has obtained the precursor of cobalt disulfide to be prepared;

[0032] (3) Weigh 70 mg of the precursor prepared in step (2) into the quartz boat, and weigh 3 gra...

Embodiment 3

[0036] (1) Weigh 0.242 grams of sodium molybdate dihydrate solid particles into the quartz boat, and weigh 3 grams of sublimed sulfur into another quartz boat, and then push the quartz boat containing the precursor into the tube Type furnace heating zone, and then push the quartz boat containing sublimated sulfur into the heating zone of the same tube furnace, and ensure that the quartz boat containing sublimated sulfur is located behind the quartz boat containing precursors, so that after high temperature sublimation The sulfur vapor passes through the precursor under the drainage of nitrogen, so that the precursor can be vulcanized;

[0037] (2) The air in the quartz tube in the tube furnace of step (1) is discharged, then feed nitrogen, set the program according to the heating rate of 40 degrees Celsius / min. The heating temperature is set to 400 degrees Celsius, and the holding time is set to 2 hours for roasting and vulcanization , when the temperature drops to room temper...

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Abstract

The invention relates to a MoS2 / CoS2 composite water-splitting hydrogen-production low-overpotential electrocatalyst and a sulfidation preparation method thereof, belonging to the technical field of catalyst preparation. The electrocatalyst provided by the invention is prepared through the following concrete steps: subjecting one selected from the group consisting of cobalt nitrate, cobalt chloride, cobalt acetate and cobalt sulfate and one selected from the group from sodium molybdate and ammonium molybdate to a hydrothermal process so as to prepare a precursor, washing the precursor so as to remove unreacted impurities like sodium ions and cobalt ions, then carrying out drying, respectively placing a proper amount of the dried precursor and a proper amount of sublimed sulfur in two quartz boats, controlling a certain heating rate and a certain calcination temperature in a nitrogen protection environment, and carrying out calcination for a certain period of time so as to obtain the MoS2 / CoS2 composite water-splitting hydrogen-production low-overpotential electrocatalyst. The electrocatalyst provided by the invention has an overpotential of only minus 287 mV when the alternating current density is minus 60 mA / cm2, and is an electrocatalyst with a low overpotential in non-noble metal electrocatalysts.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a MoS 2 / CoS 2 Composite cracking water hydrogen production low overpotential electrocatalyst and its preparation method by sulfuration method. Background technique [0002] With the acceleration of the global industrialization process, coal, oil, and natural gas, the pillar energy sources for the survival of the three major industrial productions, will be exhausted. As a new energy source, hydrogen energy has high calorific value and no pollution. Natural advantages such as a wide range of raw materials have attracted more and more attention from countries all over the world. How to prepare sustainable hydrogen energy is a common concern of energy scientists all over the world. Electrocatalytic cracking of water to produce hydrogen is a sustainable and large-scale production A means of hydrogen, but the biggest problem facing electrocatalytic water production of h...

Claims

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Application Information

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IPC IPC(8): B01J27/051C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/0515B01J35/33Y02E60/36
Inventor 张宗弢岳新政王润伟易莎莎
Owner JILIN UNIV
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