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Fe-doped MoS2 nanomaterial as well as preparation method and application thereof

A technology of nanomaterials and nickel foam, which is applied in the field of electrolytic water catalytic materials, can solve the problems of lengthy and complicated synthesis steps, and achieve the effects of simple operation, excellent catalytic performance and high yield

Active Publication Date: 2019-01-18
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalyst exhibits good catalytic performance for HER and OER in alkaline media, its synthesis steps are lengthy and complicated.

Method used

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  • Fe-doped MoS2 nanomaterial as well as preparation method and application thereof
  • Fe-doped MoS2 nanomaterial as well as preparation method and application thereof
  • Fe-doped MoS2 nanomaterial as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Preparation of iron-doped molybdenum disulfide nano-"umbrella"

[0038] Weigh 13mg (0.05mmol) of ammonium tetrathiomolybdate and 13.5mg (0.05mmol) of ferric chloride hexahydrate solid, dissolve in 12mL N,N-dimethylformamide (DMF) to form a solution, Then the solution was transferred into a stainless steel reaction kettle with polytetrafluoroethylene lining, sealed and placed in an oven, reacted at 200°C for 12h, and naturally cooled to room temperature after the reaction. After washing with deionized water and ethanol, centrifugation and drying, a black powdery iron-doped molybdenum disulfide nano-"canopy" was obtained, named Fe 0.05 -MoS 2 , where Fe represents iron ions, 0.05 represents that the molar amount of iron salt is 0.05mmol, and MoS 2 stands for molybdenum disulfide.

[0039] Such as figure 1 and figure 2 As shown, the nano-"umbrella" of iron-doped molybdenum disulfide has uniform morphology, high quality and high yield, its diameter is less th...

Embodiment 2

[0043] Example 2: Preparation of iron-doped molybdenum disulfide nano-"umbrella" electrocatalyst

[0044] Weigh 2.5mg of iron-doped molybdenum disulfide nano-"canopy" solid powder and 2.5mg of commercial carbon black for mixing, add 970 μL of isopropanol and 30 μL of 5wt.% Nafion solution, ultrasonic 1h to make it uniformly dispersed and form Ink-like solution. Take 20 μL of the above solution and add it dropwise to the surface of the polished glassy carbon electrode in batches, and let it dry naturally before use.

[0045] As a comparison, 2.5 mg of molybdenum disulfide solid powder and 2.5 mg of commercial carbon black were weighed and mixed, 970 μL of isopropanol and 30 μL of 5 wt.% Nafion solution were added, and ultrasonically dispersed for 1 h to form an ink-like solution. Take 20 μL of the above solution and add it dropwise to the surface of the polished glassy carbon electrode in batches, and let it dry naturally before use.

[0046] As a comparison, weigh 5.0 mg of ...

Embodiment 3

[0047] Example 3: HER performance test in acidic electrolyte

[0048] The entire electrocatalytic test is carried out under a standard three-electrode system, wherein the working electrode is the glassy carbon electrode prepared in Example 2, the reference electrode is an Ag / AgCl (saturated chlorine KCl solution) electrode, and the auxiliary electrode is a platinum wire electrode. The electrolyte solution used for the linear sweep voltammetry (LSV) test is 0.5M H 2 SO 4 Solution, the potential scanning range is -0.7 ~ 0V, the scanning speed is 5mV / s, and the test data have been compensated by iR.

[0049] Such as Figure 7 As shown, compared with pure MoS2, the iron-doped MoS2 nano-"canopy" exhibits excellent HER electrocatalytic performance at 10 mA cm -2 Under the current density, the value of overpotential is only 173mV, and the Tafel slope is also as low as 41.1mV·dec -1 . Double layer capacitance value is 39.8mF cm -2 , higher than that of molybdenum disulfide, indi...

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Abstract

The invention discloses a preparation method of a Fe-doped MoS2 nanomaterial. The preparation method comprises the following steps: dissolving trivalent Fe salt and ammonium tetrathiomolybdate into DMF, and reacting at 180 to 200 DEG C for 6 to 24 h to obtain the Fe-doped MoS2 nanomaterial. The invention also provides a nickel foam-loaded Fe-doped MoS2 nanomaterial which comprises a nickel foam substrate and a Fe-doped MoS2 nanomaterial loaded on the nickel foam substrate. In addition, the invention also provides the preparation method and application of the material. According to the preparation method of the Fe-doped MoS2 nanomaterial disclosed by the invention, a target product can be obtained by one step of solvent thermal reaction through simple operation; a surfactant for morphological control does not need to be introduced in the preparation process and the surface of the product is clean and easy to clean.

Description

technical field [0001] The invention relates to the technical field of electrolytic water catalytic materials, in particular to a Fe-doped MoS 2 Nanomaterials and their preparation methods and applications. Background technique [0002] The excessive exploitation and use of fossil energy has brought problems such as global warming and environmental pollution to humans. Therefore, the development of a clean energy that can replace fossil energy and the development of efficient energy conversion and storage systems have become current research hotspots, such as electrochemical Fuel cells and electrolyzed water in the field. The electrolytic decomposition of water involves hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The most commonly used electrocatalysts for HER and OER are noble metal-derived Pt / C and Ir / C electrodes, respectively. However, the high price and extremely low total content of these precious metals limit their large-scale application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/0515Y02E60/36C25B11/052C25B11/075C25B11/061C25B11/031C25B11/065C25B11/091C25B1/02B01J27/051
Inventor 郎建平薛江燕倪春燕虞虹
Owner SUZHOU UNIV
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