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MoS2/NiCo2S4/CFP three-dimensional graded structure and preparation method thereof

A hierarchical structure, three-dimensional technology, applied in the field of electrocatalytic hydrogen evolution, can solve the problems of easy stacking of sheets and low conductivity limitations, and achieve the effects of large conductivity, increased conductivity, high electrocatalytic hydrogen evolution performance and cycle stability

Active Publication Date: 2018-06-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] But two-dimensional MoS 2 During the preparation process, the sheets are easy to stack, easy to aggregate, and inherently low electrical conductivity, which greatly limits its electrocatalytic hydrogen evolution performance.

Method used

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  • MoS2/NiCo2S4/CFP three-dimensional graded structure and preparation method thereof
  • MoS2/NiCo2S4/CFP three-dimensional graded structure and preparation method thereof

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preparation example Construction

[0027] The present invention utilizes two-step hydrothermal method to prepare MoS 2 / NiCo 2 S 4 / CFP three-dimensional hierarchical structure; by adjusting the reaction time and reaction temperature, adjust NiCo 2 S 4 Nanowire arrays and MoS 2 Geometric features of nanosheets. MoS in the present invention 2 / NiCo 2 S 4 A method for preparing a three-dimensional hierarchical structure of CFP, comprising the following steps:

[0028] (1) Nickel nitrate, cobalt nitrate and urea are selected and mixed thoroughly to obtain a uniformly dispersed mixed solution.

[0029] According to the mass fraction, add 0.5-1.5 parts of nickel nitrate, 1-3 parts of cobalt nitrate and 0.5-1.5 parts of urea, add the above reactants into 60mL of deionized water, and obtain a uniformly dispersed solution after stirring and ultrasonic treatment. .

[0030] (2) Using the mixed solution as the reactant, the loaded NiCo 2 o 4 Carbon fiber paper precursors for nanowire arrays.

[0031] Pour th...

Embodiment 1

[0041] Using nickel nitrate, cobalt nitrate and urea mixture as reactants, according to the mass fraction, add 0.5 part of nickel nitrate, 1 part of cobalt nitrate and 0.5 part of urea to 60 mL of deionized water, hydrothermal reaction synthesis load Basic NiCo 2 o 4 The carbon fiber paper precursor of the nanowire array, the hydrothermal reaction temperature is 120°C, and the reaction time is 5h. Next, ammonium heptamolybdate tetrahydrate and sulfur powder solution were used as reactants, the molar ratio of which was 1:5, and the above-mentioned loaded base NiCo 2 o 4 Carbon fiber paper with nanowire arrays as precursor, hydrothermal reaction to synthesize MoS 2 / NiCo 2 S 4 / CFP three-dimensional hierarchical structure. The hydrothermal reaction temperature is 180°C, and the reaction time is 6h.

[0042] Basic NiCo supported on carbon fiber paper in this example 2 o 4 The density of nanowire arrays is small, NiCo 2 o 4 The nanowire array is tightly combined with th...

Embodiment 2

[0044] Using nickel nitrate, cobalt nitrate and urea mixture as reactants, according to the mass fraction, add 0.5 part of nickel nitrate, 1 part of cobalt nitrate and 0.5 part of urea to 60 mL of deionized water, hydrothermal reaction synthesis load Basic NiCo 2 o 4 The carbon fiber paper precursor of the nanowire array, the hydrothermal reaction temperature is 120°C, and the reaction time is 10h. Next, ammonium heptamolybdate tetrahydrate and sulfur powder solution were used as reactants, the molar ratio of which was 1:5, and the above-mentioned loaded base NiCo 2 o 4 Carbon fiber paper with nanowire arrays as precursor, hydrothermal reaction to synthesize MoS 2 / NiCo 2 S 4 / CFP three-dimensional hierarchical structure. The hydrothermal reaction temperature is 180°C, and the reaction time is 6h.

[0045] Basic NiCo supported on carbon fiber paper in this example 2 o 4 Nanowire arrays are less dense, NiCo 2 o 4 The nanowire array is tightly combined with the carbon...

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Abstract

The invention discloses a preparation method of a MoS2 / NiCo2S4 / CFP three-dimensional graded structure for improving the electrocatalytic hydrogen evolution efficiency. The MoS2 / NiCo2S4 / CFP three-dimensional graded structure is synthesized by way of a two-step hydrothermal method, wherein NiCo2S4 nanowire arrays coated by two-dimensional MoS2 nanosheet layers are formed by taking carbon fibers as amatrix; a MoS2 / NiCo2S4 / CFP three-dimensional graded structure is formed by fully dispersing the self-supported NiCo2S4 nanowire arrays with good conductivity in the two-dimensional MoS2 nanosheet layers by improving the conductivity of the material by means of the carbon fibers; and the electrocatalytic hydrogen evolution activity is improved remarkably by means of high density active sites exposed by the dispersed MoS2 nanosheet layers. Furthermore, the whole three-graded structure configuration provides an effective channel for quick transfer of electrons and quick export of gas. The preparation method disclosed by the invention is simple and clear in technical train of thought, and the composite material increases the electrocatalytic hydrogen evolution efficiency remarkably. The invention discloses the technical train of thought for preparing the two-dimensional material graded material by means of the hydrothermal method and enhancing the electrocatalytic hydrogen evolution efficiency.

Description

【Technical field】 [0001] The invention belongs to the field of electrocatalytic hydrogen evolution and relates to a MoS 2 / NiCo 2 S 4 / CFP three-dimensional hierarchical structure and its preparation method. 【Background technique】 [0002] Environmental pollution and energy crisis are the key issues restricting the rapid development of the current society. An important means to solve environmental and energy problems is to develop new energy sources. Environmentally friendly new energy sources such as wind energy, solar energy, and tidal energy are discontinuous and change with the seasons, which greatly limits the utilization rate of energy. Hydrogen energy is a clean energy with the highest specific energy density, and it is gradually becoming a new type of energy. important candidates. As an important means of hydrogen conversion, the electrolytic hydrogen production process has a simple and high-efficiency preparation device. Among them, the Pt group noble metal cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06D06M11/53B01J27/051D06M101/40
CPCC25B1/04D06M11/53B01J27/0515D06M2101/40C25B11/091B01J35/33Y02E60/36
Inventor 马飞孙兰张龙徐可为
Owner XI AN JIAOTONG UNIV
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