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A composition-controllable nickel-cobalt compound nanowire and its preparation method and application

A technology of nanowires and compounds, applied in the field of nickel-cobalt compound nanowires and their preparation, can solve the problems of low solubility, high price, unsatisfactory catalytic performance of electrolyzed water, etc., and achieves simple preparation process, low cost, good electrolysis and the like. The effect of water catalytic performance

Active Publication Date: 2019-01-22
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the existing hydrogen production technology by electrolysis of water, platinum group metals are the most effective catalysts for hydrogen production by electrolysis of water, but the materials of platinum group metals are scarce and expensive. Hydrogen catalysts have always been the focus of research in this field
Current studies have found that transition metal sulfides and selenides have the characteristics of low solubility, high catalytic activity, and stable chemical properties. ideal

Method used

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  • A composition-controllable nickel-cobalt compound nanowire and its preparation method and application
  • A composition-controllable nickel-cobalt compound nanowire and its preparation method and application
  • A composition-controllable nickel-cobalt compound nanowire and its preparation method and application

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preparation example Construction

[0027] Specifically, the preparation method of the nickel-cobalt compound nanowire with controllable composition may include the following steps:

[0028] Step A. Mix nickel nitrate, cobalt nitrate and urea in water to obtain a nickel nitrate concentration of 0.5-2.0 mmol / L, a cobalt nitrate concentration of 0.25-1.0 mmol / L, and a urea concentration of 5-10 Millimoles / L of precursor mixed solution. In practical applications, nickel nitrate, cobalt nitrate and urea can be added to the water so that the nickel nitrate, cobalt nitrate and urea are mixed together in the water.

[0029] Step B: Transfer the substrate and the precursor mixed solution to an autoclave, and react at 80-150°C for 200-400 minutes, thereby preparing NiCo on the substrate 2 (OH)(CO 3 ) 2 Nanowires. In practical applications, the substrate is carbon fiber cloth (Carbon Fiber Cloth, CFC), foamed nickel or titanium foil, but it is better to use carbon fiber cloth (for example, carbon fiber cloth with a size of 1×...

Embodiment 1

[0041] A NiCo based on CFC 2 (S 0.43 Se 0.57 ) 4 Nanowires are prepared using the following steps:

[0042] Step a1. Add nickel nitrate, cobalt nitrate and urea to the water and mix to obtain a precursor with a nickel nitrate concentration of 1.5 mmol / L, a cobalt nitrate concentration of 0.75 mmol / L, and a urea concentration of 7.5 mmol / L mixture.

[0043] Step b1. Using the CFC with a size of 1X3cm as the substrate, transfer the CFC and the precursor mixture solution described in step a1 to a 20-100 mL autoclave, and react at 110°C for 300 minutes, thereby preparing CFC NiCo based 2 (OH)(CO 3 ) 2 Nanowires.

[0044] Step c1, for NiCo based on CFC 2 (OH)(CO 3 ) 2 The nanowires are dried, and then in accordance with the mass ratio of the precursor mixture solution: sulfur powder and selenium powder = 1:20, the NiCo based on CFC 2 (OH)(CO 3 ) 2 The nanowires are placed in a porcelain boat containing a mixed powder of 20 mg of sulfur powder and 20 mg of selenium powder (that is, the ma...

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Abstract

The invention discloses a nickel-cobalt compound nanowire with controllable composition, and a preparation method and application thereof. The nickel-cobalt compound nanowire with controllable composition has a general formula as follows: NiCo2(S1-xSex) 4, wherein x is larger than 0 and smaller than 1; the morphology is a pearly nanowire formed by serial connection of a plurality of small particles. The preparation method comprises the steps of mixing nickel nitrate, cobalt nitrate and urea in water to prepare a precursor mixed solution; transferring a substrate and the precursormixed solution into an autoclave, reacting at the temperature of 80 to 150 DEG C for 200 to 400 minutes, and preparing to obtain a NiCo2(OH)(CO3)2 nanowire; drying the substrate and the NiCo2(OH)(CO3)2 nanowire, putting in mixed powder of powdered sulfur and selenium powder, heating in protection gas at the temperature of 400 to 500 DEG C for 0.5 to 2 hours, and cooling to room temperature. The nickel-cobalt compound nanowire provided by the invention has better electrolyzed water catalytic performance, and furthermore, the preparation process is simple, fast and high-efficient, low-cost, environment friendly without pollution, and suitable for large-scale industrial production.

Description

Technical field [0001] The invention relates to the field of nickel-cobalt nanomaterials, in particular to a nickel-cobalt compound nanowire with a controllable composition and a preparation method and application thereof. Background technique [0002] With the increasingly prominent energy and environmental issues, looking for a new renewable and environmentally friendly energy source has become the focus of global attention. Hydrogen energy has the advantages of high efficiency and no pollution, so it has always been regarded as the most ideal and most potential energy carrier. However, most of the current hydrogen production technologies have the disadvantages of high energy consumption and low efficiency, which makes the cost of hydrogen production very high , So it is difficult to achieve large-scale commercial applications. [0003] At present, the existing hydrogen production technologies mainly include solar photovoltaic hydrogen production, hydrogen production by electrol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/00B82Y40/00C25B11/06C25B1/04
CPCC01B19/002C01P2002/72C01P2002/85C01P2004/03C01P2004/16C25B1/04C25B11/075Y02E60/36
Inventor 李越孙一强杭立峰
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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