Preparation method and application of MXene nano-sheet with Mo vacancy

A nanosheet, vacancy technology, applied in nanotechnology, chemical instruments and methods, tungsten/molybdenum carbides, etc., can solve the problems of complex steps, less than ideal electrocatalytic activity of MXene, and low yield.

Active Publication Date: 2018-08-10
DONGGUAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0003] Based on this, it is necessary to provide a kind of MXene nanosheets with Mo vacancies in view of the unsatisfactory electrocatalytic activity of the currently

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  • Preparation method and application of MXene nano-sheet with Mo vacancy
  • Preparation method and application of MXene nano-sheet with Mo vacancy
  • Preparation method and application of MXene nano-sheet with Mo vacancy

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preparation example Construction

[0030] see figure 1 , the preparation method of the MXene nanosheet with Mo vacancy of one embodiment comprises the following steps:

[0031] S110, preparing a Mo-containing MXene nanomaterial.

[0032] The preparation of MXene nanomaterials generally uses precursor MAX and hydrofluoric acid (HF) as raw materials, and the structural formula of the precursor MAX is generally M n+1 AX n , where M, A and X represent transition metals, main elements of group IIIA or IVA, carbon or nitrogen, respectively. The exposed faces of the upper and lower layers in the MAX structure are typically transition metals. The process of preparing MXene from MAX generally requires relatively harsh synthesis conditions, and the commonly used method is to use HF to its precursor M n+1 AX n MAX is processed, and the Al element in the MAX structure is etched away to obtain the corresponding MXene. During the corrosion process, the transition metal surface of MXene will be replaced by -O, -OH or -...

Embodiment 1

[0067] (1) 0.5g Mo 2 TiAlC 2 It was added to 10 mL of HF acid solution with a mass concentration of 50%, heated to 35°C and reacted for 48 hours to obtain a reaction solution. After centrifuging the reaction solution, the lower layer solid was washed until the pH value of the supernatant was 6. Freeze drying to obtain Mo 2 TiC 2 nanomaterials.

[0068] (2) Take 4 mg of Mo 2 TiC 2 The nanomaterial is dispersed in 1 mL of dispersion liquid to obtain a nanodispersion liquid, wherein the dispersion liquid is a mixed liquid of water and isopropanol with a volume ratio of 1:1.

[0069] (3) Coating the nano-dispersion on the glassy carbon electrode, the coating amount of the nano-dispersion on the glassy carbon electrode is 0.04mg / cm 2 .

[0070] (4) above-mentioned glassy carbon electrode, mercurous sulfate electrode and carbon rod electrode are constituted three-electrode system, and the electrolyte of three-electrode system is that the molar concentration is the H of 0.5M ...

Embodiment 2

[0074] (1) 0.5g Mo 2 TiAlC 2 It was added to 30 mL of HF acid solution with a mass concentration of 35%, heated to 55° C. and reacted for 24 h to obtain a reaction solution. After centrifuging the reaction solution, the lower layer solid was washed until the pH value of the supernatant was 7. drying and grinding to obtain Mo 2 TiC 2 nanomaterials.

[0075](2) Take 10 mg of Mo 2 TiC 2 The nanomaterials were dispersed in 10 mL of dispersion liquid to obtain a nanodispersion liquid, wherein the dispersion liquid was a mixed liquid of water and ethanol with a volume ratio of 1:4.

[0076] (3) The nano-dispersion liquid is coated on the glassy carbon electrode, and the coating amount of the nano-dispersion liquid on the glassy carbon electrode is 0.08 mg / cm 2 .

[0077] (4) above-mentioned glassy carbon electrode, mercurous sulfate electrode and carbon rod electrode are constituted three-electrode system, and the electrolyte of three-electrode system is that the molar concen...

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Abstract

The invention relates to a preparation method and application of an MXene nano-sheet with a Mo vacancy. The preparation method of the MXene nano-sheet with the Mo vacancy comprises the following steps: dispersing an MXene nano-material containing Mo into a dispersion solution to obtain a nano dispersion solution; coating a working electrode with the nano dispersion solution; forming a three-electrode system by the working electrode coated with the nano dispersion solution, a reference electrode and a counter electrode, wherein the pH (Potential of Hydrogen) value of electrolyte of the three-electrode system is 0 to 6; applying additional voltage to the three-electrode system and carrying out electrochemical reaction to obtain the MXene nano-sheet with the Mo vacancy. According to the preparation method of the MXene nano-sheet with the Mo vacancy, complete peeling of a nano-sheet layer material can be realized, and a lot of organic solvents are not used; a technology is simpler and theyield is remarkably improved; a lot of the MXene nano-sheets with the Mo vacancy can be prepared through regulating and controlling surface characteristics, so that the MXene nano-sheets with the Mo vacancy have better electro-catalytic hydrogen evolution reaction activity.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a preparation method and application of MXene nanosheets with Mo vacancies. Background technique [0002] MXene is a new type of two-dimensional layered materials, including transition metal carbides, nitrides, etc. Due to its excellent electrical conductivity, chemical stability, and hydrophilicity, MXenes exhibit excellent electrochemical performance in Li / Na-ion batteries, Li-S batteries, supercapacitors, water splitting, and other fields. Theoretical calculations indicate that the O-terminated site on the MXene surface is the catalytically active site for the electrocatalytic hydrogen evolution reaction. However, the electrocatalytic activity of the currently prepared MXenes is not ideal. Therefore, screening MXenes with good electrocatalytic activity and modifying them is the current research focus of MXenes in the field of electrocatalysis. Moreover, the current pre...

Claims

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Application Information

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IPC IPC(8): C01B32/949C01B32/921B82Y40/00C25B11/04C25B1/04
CPCB82Y40/00C01P2002/20C01P2004/03C01P2004/22C25B1/04C25B11/04C01B32/921C01B32/949C25B1/00C01B32/90C25B11/075H01M4/624Y02E60/10Y02E60/36
Inventor 赵玉飞张美丽吴文剑蔡丽蓉范洪波
Owner DONGGUAN UNIV OF TECH
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