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Composite carbon-based [Mo3S13]<2-> electrochemical hydrogen evolution catalyst and preparation method thereof

A composite carbon and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as low electron transfer efficiency, and achieve improved electrochemical hydrogen evolution characteristics, small electrochemical impedance, Ease of industrial mass production

Inactive Publication Date: 2018-04-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to expose more S atoms to improve its catalytic activity, and trimolybdenum trisulfide ([Mo 3 S 13 ] 2- ) has more exposed S atoms than molybdenum disulfide, and its catalytic activity is relatively higher than that of molybdenum disulfide, but the electron transfer efficiency is low

Method used

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  • Composite carbon-based [Mo3S13]&lt;2-&gt; electrochemical hydrogen evolution catalyst and preparation method thereof
  • Composite carbon-based [Mo3S13]&lt;2-&gt; electrochemical hydrogen evolution catalyst and preparation method thereof
  • Composite carbon-based [Mo3S13]&lt;2-&gt; electrochemical hydrogen evolution catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of carbon-based thirteen sulfur trimolybdenum composite electrochemical hydrogen evolution catalyst, the specific steps are as follows:

[0042] (1) Synthesis of (NH4)2Mo3S13 nH2O

[0043] 1) Dissolve (NH4)6Mo7O24·4H2O in ultrapure water with a mass ratio of 1:5;

[0044] 2) Add ammonium polysulfide solution at a volume ratio of 1:6;

[0045] 3) heating the mixture at 96°C for 1024 hours;

[0046] 4) The obtained product is washed with ultrapure water, alcohol, and carbon disulfide to remove excess S element in sequence. That is, purified trimolybdenum tridesulfide crystals were obtained.

[0047] (2) Preparation of reduced graphene oxide carbon nanotube airgel:

[0048] a) Graphene oxide and carbon nanotubes were mixed with ultrapure water at 1 mg / mL respectively, and ultrasonically treated for 30 minutes;

[0049] b) After mixing the solutions in 1), add ascorbic acid at 1 mL / 0.05 g, and then sonicate for 2 hours.

[0050] c) The sonicated m...

Embodiment 2

[0063] With the preparation method of the carbon-based thirteen sulfur trimolybdenum composite electrochemical hydrogen evolution catalyst described in Example 1, the difference is:

[0064] In the preparation of thirteen sulfur trimolybdenum composite graphene carbon nanotube airgel catalyst, thirteen sulfur trimolybdenum, reduced graphene oxide carbon nanotube airgel combined with N, N-dimethylformamide according to 1mg: 3mg : Mix in proportion of 1mL.

Embodiment 3

[0066] With the preparation method of the carbon-based thirteen sulfur trimolybdenum composite electrochemical hydrogen evolution catalyst described in Example 1, the difference is:

[0067] In the preparation of the tridethiridesulfur trimolybdenum composite graphene carbon nanotube airgel catalyst, the sealing reaction temperature was 250°C, and the reaction time was 15 hours.

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Abstract

The invention relates to a composite carbon-base [Mo3S13]<2-> electrochemical hydrogen evolution catalyst and a preparation method thereof. The catalyst contains reduced graphene oxide carbon nano-tube aerogel and [Mo3S13]<2->, wherein [Mo3S13]<2-> is loaded on pores and surface of a net structure of the reduced graphene oxide carbon nano-tube aerogel, and the mass ratio of [Mo3S13]<2-> to the reduced graphene oxide carbon nano-tube aerogel is (1-10) to 2. By loading the reduced graphene oxide carbon nano-tube aerogel with [Mo3S13]<2->, more active sulfur atoms can be exposed, the dispersity of active substances can be further improved, and the electron transfer rate can be increased, so that the catalyst can integrally present excellent electrochemical hydrogen evolution properties such as relatively low hydrogen evolution overpotential (-.-0.12V), relatively small Tafel slope (-62mV / dec) and relatively small electrochemical impedance (-7ohm); and after 1000 cyclic voltammetry scanning, a polarization curve becomes very small, and the relatively stability is presented.

Description

technical field [0001] The invention relates to a composite carbon-based thirteen-sulfur trimolybdenum electrochemical hydrogen evolution catalyst and a preparation method thereof, belonging to the field of new energy material preparation. Background technique [0002] The new energy sources currently being researched include solar energy, wind energy, hydrogen energy, biomass energy, and nuclear energy. Among them, hydrogen, as a clean energy source, has the advantages of high combustion value and zero pollution emission, and has received widespread attention. One of the most simple and economical ways to produce hydrogen is to electrolyze water to produce hydrogen, but in order to further increase the hydrogen production rate and reduce the overpotential, it is necessary to use a certain high-efficiency electrocatalyst. Platinum-based noble metals are known to be the most active catalysts for electrocatalytic water splitting. However, they suffer from low crust content an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051C25B1/04C25B11/06
CPCB01J27/051C25B1/04C25B11/04Y02E60/36
Inventor 许醒尚亚男任中飞高宝玉岳钦艳
Owner SHANDONG UNIV
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