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Nickel-cobalt compound nanowire with controllable composition, and preparation method and application thereof

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

Active Publication Date: 2017-06-20
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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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

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  • Nickel-cobalt compound nanowire with controllable composition, and preparation method and application thereof
  • Nickel-cobalt compound nanowire with controllable composition, and preparation method and application thereof
  • Nickel-cobalt compound nanowire with controllable composition, and preparation method and application thereof

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preparation example Construction

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

[0028] Step A, mixing nickel nitrate, cobalt nitrate and urea together in water, so that the concentration of nickel nitrate is 0.5~2.0 mmol / liter, the concentration of cobalt nitrate is 0.25~1.0 mmol / liter, and the concentration of urea is 5~10 mmol / L precursor mixed solution. In practical application, nickel nitrate, cobalt nitrate and urea may be added to water so that nickel nitrate, cobalt nitrate and urea are mixed together in water.

[0029] Step B, transferring the substrate and the precursor mixed solution to an autoclave, and reacting at 80-150°C for 200-400 minutes, so as to prepare NiCo on the substrate 2 (OH)(CO 3 ) 2Nanowires. In practical applications, the substrate is carbon fiber cloth (Carbon Fiber Cloth, CFC), nickel foam or titanium foil, but it is better to use carbon fiber cloth (for example: carbon fiber cloth...

Embodiment 1

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

[0042] Step a1, adding nickel nitrate, cobalt nitrate and urea to the water and mixing to prepare 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 base, transfer the CFC and the precursor mixed solution described in step a1 to a 20-100mL autoclave, and react at 110°C for 300 minutes to obtain a CFC NiCo 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 according to the mixed solution of the precursor: the mass ratio of the mixed powder of sulfur powder and selenium powder=1:20, the NiCo based on CFC will be 2 (OH)(CO 3 ) 2 The nanowire is placed in a porcelain boat filled with 20mg sulfur powder and 20mg selenium powder mixed powder (that...

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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 composition-controllable nickel-cobalt compound nanowire and its preparation method and application. Background technique [0002] With the increasingly prominent energy and environmental issues, looking for a renewable and environmentally friendly new energy has become the focus of global attention. Hydrogen energy has the advantages of high efficiency and no pollution, so it has always been considered as the most ideal and 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 still difficult to achieve large-scale commercial application. [0003] At present, the existing hydrogen production technologies mainly include solar photovoltaic hydrogen production, electrolytic water hydrogen production, r...

Claims

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Application Information

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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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