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Microspherical Fe-doped trinickel disulfide nanostructured material composed of nanosheets, and preparation method and application thereof

A nanostructure and nanosheet technology, applied in nanomaterial preparation methods and electrocatalysis applications, to achieve the effects of environmentally friendly preparation process, excellent catalytic activity and stability, and low cost

Active Publication Date: 2019-09-13
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carefully construct a heteroatom-doped nickel sulfide nanostructure material, simultaneously adjust the morphology and electronic structure, obtain high conductivity and unique surface chemistry that is conducive to water dissociation, and further enhance the electrocatalytic water splitting behavior, Very important for practical applications, but still a big challenge

Method used

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  • Microspherical Fe-doped trinickel disulfide nanostructured material composed of nanosheets, and preparation method and application thereof
  • Microspherical Fe-doped trinickel disulfide nanostructured material composed of nanosheets, and preparation method and application thereof
  • Microspherical Fe-doped trinickel disulfide nanostructured material composed of nanosheets, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0043] A Microspherical Fe-doped Ni Composed of Nanosheets 3 S 2 A method for preparing a nanostructured material, comprising the following steps:

[0044] Soak 2×3cm foam nickel in 6M hydrochloric acid solution, after 15 minutes, wash the foam nickel three times with deionized water and absolute ethanol, and dry to obtain surface-clean foam nickel. Accurately measure 40mL ethylene glycol into a clean small beaker, then weigh 2mmol Ni(NO 3 ) 2 ·6H 2 O, 0.6mmol Fe(NO 3 ) 3 9H 2 O and 1.5 mmol thiourea were added into a small beaker, stirred and dissolved for 20 min to obtain a uniform solution. Transfer the solution to a 50mL polytetrafluoroethylene-lined stainless steel reaction kettle, insert the pre-treated nickel foam obliquely into the solution, seal it and react in an oven at 140°C for 8 hours, and cool it naturally to room temperature after the reaction is over. The nickel foam covering the sample was washed three times with deionized water and absolute ethanol, ...

Embodiment 2

[0051] Accurately measure 40mL of ethylene glycol into a clean small beaker, then weigh 2mmol of Ni(NO 3 ) 2 ·6H 2 O, 0.4mmol or 0.8mmol of Fe(NO 3 ) 3 9H 2 O and 1.5mmol of thiourea were added to a small beaker and stirred evenly. Insert the dried nickel foam obliquely into a 50mL polytetrafluoroethylene-lined stainless steel reaction kettle, transfer it to the reaction kettle after the solution is fully dissolved, seal it and react in an oven at 140°C for 8 hours. After the reaction is complete, cool down to room temperature naturally, wash the nickel foam covering the sample several times with deionized water and absolute ethanol, and then dry the nickel foam covering the sample in a vacuum drying oven at 60°C for 12 hours to obtain Fe Fe-doped Ni composed of nanosheets with doping levels of 14.0% and 20.9% 3 S 2 Microspherical nanostructures.

[0052] Carry out phase characterization to the product obtained in embodiment 2 with X-ray powder diffractometer, the resu...

Embodiment 3

[0058] A Microspherical Fe-doped Ni Composed of Nanosheets 3 S 2 Application of nanomaterials as catalysts for the oxygen evolution reaction (OER).

[0059] The specific application method is: the microspherical Fe-doped Ni 3 S 2 Nanomaterials were used as working electrodes, and platinum wire and Ag / AgCl electrodes were used as counter electrodes and reference electrodes, respectively, to be tested in 1.0M KOH electrolyte solution using CHI760E electrochemical workstation. Using linear sweep voltammetry (LSV) at 2.0mV s -1 Polarization curves were obtained at a scan rate of 90% and an ohmic compensation of 90%. Such as Figure 12 As shown, Fe-doped Ni 3 S 2 The nanostructure only needs a low overpotential of 233mV to achieve 50mA cm -2 The current density of Ni 3 S 2 and commercial RuO 2 Small 92mV and 57mV, Ni 3 S 2 The preparation is to omit the Fe(NO in the raw material on the basis of Example 1 3 ) 3 9H 2O prepared. The OER electrocatalytic stability was ...

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Abstract

The invention discloses a microspherical Fe-doped trinickel disulfide nanostructure material composed of nanosheets, and a preparation method and application thereof. The preparation method comprisesthe following steps: dissolving a nickel salt, an iron salt and thiourea in ethylene glycol, transferring the formed solution into a reaction vessel, obliquely placing foamed nickel into the solution,performing a solvothermal reaction, carrying out cooling to room temperature after completion of the reaction, and washing and drying a product so as to obtain the microspherical Fe-doped trinickel disulfide nanostructured material composed of nanosheets. Compared with the prior art, the invention is different in that the microspherical Fe-doped Ni3S2 nanostructure composed of the nanosheets is designed and synthesized on a conductive foamed nickel substrate. Fe doping is used for improving the electrochemically active area and conductivity of the material. The microspherical Fe-doped Ni3S2 nanostructured material composed of the nanosheets in the invention is applied as an electrocatalyst for oxygen evolution reactions, hydrogen evolution reactions and full water decomposition reactionsand has the advantages of high catalytic activity, excellent stability, simple preparation process and low cost.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation method and electrocatalysis application, in particular to a microspherical Fe-doped Ni composed of nanosheets 3 S 2 Nanostructured materials, preparation methods and applications. Background technique [0002] Electrocatalytic water splitting into hydrogen and oxygen offers a forward-looking and competitive technology to generate sustainable and renewable energy. However, the high overpotentials of the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) half-cell reactions severely limit the practical application of total water splitting. The advancement of this technology requires highly active, stable, and low-cost electrocatalytic materials to lower the energy barrier and improve the overall energy efficiency of OER and HER processes. [0003] In recent years, substantial research efforts have been devoted to earth-abundant and cost-effective electrocatalysts for OER...

Claims

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Application Information

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IPC IPC(8): B01J27/043B01J35/10C25B11/06C25B1/04
CPCB01J27/043C25B11/04C25B1/04B01J35/33B01J35/61Y02E60/36
Inventor 吴正翠黄建松
Owner ANHUI NORMAL UNIV
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