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Three-dimensional graphene/ carbon nano tube based molybdenum disulfide/cobaltous sulfide composite material electrocatalyst as well as preparation method and application thereof

A carbon nanotube, molybdenum disulfide technology, applied in electrodes, electrolysis process, electrolysis components, etc., to achieve the effect of prolonging cycle life, simple preparation process, and improving catalytic activity

Active Publication Date: 2018-04-13
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN104071744 discloses the use of electrospinning technology to prepare polymer fibers with core-shell structure containing molybdenum and cobalt, using sulfur powder as the sulfur source, controlling the annealing temperature, and synthesizing metal sulfide-based core-shell structure electrocatalytic materials to achieve 10 mA / cm 2 The overpotential required for the current density is reduced to 190 mV, and the performance improvement is mainly attributed to the complex cobalt compound changing the d-band electron density of the molybdenum atom, but the Tafel slope of the hydrogen evolution is still as high as 110 mV / Dec
Although these technologies have improved the hydrogen evolution activity of molybdenum sulfide to a certain extent, how to design and synthesize molybdenum sulfide-based catalysts with high catalytic activity is still one of the major challenges in this field.

Method used

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  • Three-dimensional graphene/ carbon nano tube based molybdenum disulfide/cobaltous sulfide composite material electrocatalyst as well as preparation method and application thereof
  • Three-dimensional graphene/ carbon nano tube based molybdenum disulfide/cobaltous sulfide composite material electrocatalyst as well as preparation method and application thereof
  • Three-dimensional graphene/ carbon nano tube based molybdenum disulfide/cobaltous sulfide composite material electrocatalyst as well as preparation method and application thereof

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Embodiment 1

[0027] Sample preparation: Measure 20ml of graphene oxide (GO) solution with a concentration of 1mg / ml, add 4mg of hydroxylated multi-walled carbon nanotubes (CNTs-OH), after ultrasonication for two hours, add 80mg of ascorbic acid, 200 mg of Sodium molybdate water and 98 mg of cobalt chloride hexahydrate, the molar ratio of molybdenum source content to cobalt source content is 2:1, and finally 400 mg of thiourea is added sonicated until completely dissolved, and moved to a 100 ml reaction kettle. Put the reactor into an oven, set the temperature at 180 °C, and react for 24 h. After the reaction, cool down, filter the product in the reactor with suction, wash three times with distilled water to obtain a hydrogel-like solid substance, and freeze-dry to obtain a three-dimensional columnar structure of graphene / carbon nanotube-based molybdenum disulfide / cobalt sulfide composite Electrocatalysis (GC4 / MoS 2 / CoS).

[0028] Electrocatalytic application: 2 mg of sample is dispersed...

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Abstract

The invention belongs to the field of catalytic materials, and particularly relates to a three-dimensional graphene / carbon nano tube based molybdenum disulfide / cobaltous sulfide composite material electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: step I, treating a precursor: performing ultrasonic treatment on a certainamount of oxidized graphene and a modified carbon nano tube, adding ascorbic acid, thiourea and a metal ion precursor to be uniformly mixed, wherein the metal ion precursor is sodium molybdate and cobalt chloride; step II, performing a hydrothermal reaction process: transferring mixed composite into a reaction kettle, heating the composite to a temperature of 160-200 DEG C, reacting for 20-28 hours at the temperature, conducting cooling to the room temperature to obtain a gel-like black substance, and conducting washing and freeze-drying to obtain a cylindrical black solid. A graphene / carbonnano tube with a three-dimensional network structure provides a quick electron transfer path and an ion transport channel, and molybdenum disulfide / cobaltous sulfide with a nano structure is anchoredon three-dimensional structural carbon to expose more electro-active sites, so that electrochemical hydrogen evolution property is cooperatively improved.

Description

technical field [0001] The invention belongs to the field of catalytic materials, and in particular relates to a three-dimensional graphene / carbon nanotube-based molybdenum disulfide / cobalt sulfide composite electrocatalyst and its preparation method and application. Background technique [0002] Hydrogen is considered as a sustainable and clean energy. Water electrolysis is one of the effective ways to produce hydrogen. High-efficiency hydrogen evolution catalysts are often required in the process of water splitting reaction, so that the reaction can generate a larger current at a lower overvoltage. At present, Pt / C catalyst has the best hydrogen production performance in water electrolysis on the market, but due to its scarcity of resources and high cost, it cannot be applied on a large scale. Many researchers have tried to develop low-cost alternatives with similar activity to Pt. [0003] In recent years, some non-noble metals have been reported as hydrogen evolution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B1/04
CPCC25B1/04C25B11/091Y02E60/36
Inventor 陈锡安奚乔亚邓文娟陈慈悦魏会方黄少铭
Owner WENZHOU UNIVERSITY
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