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Mulberry-like NiS/Ni composite nanoparticles, preparation method and applications thereof

A composite nanoparticle and nanoparticle technology, applied in the field of catalyst preparation, can solve the problems of poor electrochemical stability, large hydrogen evolution overpotential, and large Tafel slope, so as to improve catalytic performance, optimize hydrogen evolution activity, and improve catalytic activity. Effect

Active Publication Date: 2019-12-31
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, elemental nickel nanoparticles have poor electrochemical stability due to problems such as structural size and surface activity. Therefore, structural coating or heterogeneous composites are commonly used to improve stability. For example, Qiao et al. (Energy Environ.Sci, 2013, 6,3693–3699) reported a nitrogen-doped nickel nanoparticle catalyst prepared by hydrothermal reduction of graphene confinement. The material exhibited a high current density, but the Tafel slope of the intrinsic activity was large; Xv et al. (Adv. Mater. 2017, 29, 1605957) reported the application of a few-layer nitrogen-doped carbon-coated nickel nanoparticles for electrolysis of water, but there is a high-temperature carbonization at 800°C to achieve carbon coating. , leading to a waste of energy, and in addition, the material has a large hydrogen evolution overpotential; Ho et al. (Nano Energy, 2016, 27, 247-254) reported the hydrogen evolution application of nickel-molybdenum alloy nanomaterials, and the alloying strategy is used to improve the performance, which has a good hydrogen evolution Catalytic activity, but the use of 20% hydrogen in the preparation process has a greater safety hazard

Method used

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  • Mulberry-like NiS/Ni composite nanoparticles, preparation method and applications thereof
  • Mulberry-like NiS/Ni composite nanoparticles, preparation method and applications thereof
  • Mulberry-like NiS/Ni composite nanoparticles, preparation method and applications thereof

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Experimental program
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Effect test

Embodiment 1

[0034] A preparation method of mulberry-shaped NiS / Ni composite nanoparticles, comprising the following steps:

[0035] Step 1: Add nickel sulfate and ammonium persulfate into deionized water according to the molar ratio of 4:1, and mix evenly by ultrasonic to obtain a mixed solution A with a nickel ion concentration of 0.33M; add it according to the volume ratio of mixed solution A to ammonia water at 12:1 Ammonia, mixed evenly to obtain a mixed solution B, put 5 pieces of carbon cloth into the mixed solution B, and let it stand for 20 minutes for the growth of the nickel hydroxide precursor. After the reaction, take out the carbon cloth, wash it with deionized water, and dry it naturally;

[0036] Step 2: Put the carbon cloth loaded with nickel hydroxide obtained in step 1 into a 50ml reactor liner, add 25ml of ethanol and 5ml of isopropanol, seal it and put it in an oven, react at 195°C for 18h, and the reaction is over Finally, take out the substrate and wash it several ti...

Embodiment 2

[0043] NiS / Ni composite nanoparticles were prepared according to the steps in Example 1, and the reaction time in Step 5 was adjusted to 60s, 90s, 120s, and 150s, and other steps remained unchanged.

[0044] The X-ray diffraction XRD characterization figure of the mulberry-shaped NiS / Ni composite nanoparticles obtained in the present embodiment is as follows figure 2 Shown, the hydrogen evolution and oxygen evolution reaction electrochemical performance characterization diagram in 1M KOH solution is as follows image 3 As shown, the stability test curve of the continuous electrolysis of the mulberry-like NiS / Ni composite nanoparticle electrode in 1M KOH solution obtained by loading reaction for 90s is as follows: Figure 4 shown.

Embodiment 3

[0046] NiS / Ni composite nanoparticles were prepared according to the steps in Example 1, the amount of sulfur powder reacted was adjusted to 2 mg, and other steps were kept unchanged.

[0047] The more the amount of sulfur source, the higher the yield of sulfide; if it is too high, the Ni nanoparticles will even completely sulfide into nickel sulfide particles.

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Abstract

The invention provides mulberry-like NiS / Ni composite nanoparticles and a preparation method thereof, and applications in electrocatalytic water decomposition, and belongs to the technical field of catalyst preparation. According to the preparation method, the mulberry-like composite material is obtained by carrying out partial vulcanization treatment on nickel nanoparticles, wherein the degree ofthe vulcanization reaction is regulated by regulating the reaction time and the amount of the sulfur powder so as to obtain the mulberry-like NiS / Ni composite structure with a good surface structure,such that the water electrolysis catalyst has advantages of high catalytic activity and electrochemical stability at the same time, and the material can be used as a hydrogen evolution electrode andan oxygen evolution electrode, and has double functions.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a mulberry-shaped NiS / Ni composite nanoparticle, a preparation method thereof, and an application in electrocatalytic water splitting. Background technique [0002] Energy and environmental issues have become difficult problems that must be solved in the future social and economic development, and the development of clean and renewable energy provides a practical solution for sustainable economic and social development. As an important part of clean energy, hydrogen is clean and pollution-free. Therefore, the development of large-scale hydrogen production technology with high energy efficiency and low cost will have very significant social and economic benefits. The use of electrocatalytic water splitting technology to produce hydrogen is an important way of hydrogen production, which can be used for restorage and utilization of intermittent clean energy ...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06C23C18/34B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C23C18/1658C23C18/1689C23C18/34C25B1/04C25B11/091Y02E60/36
Inventor 熊杰张露莹黄建文杜新川陈心睿邬春阳王显福晏超贻
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA