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Preparation and hydrogen storage method of calcium-doped modified two-dimensional black phosphorus nanosheet

A technology of calcium element and nanosheets, which is applied in the preparation and hydrogen storage of two-dimensional black phosphorus nanosheets doped with calcium elements, can solve the problems of poor stability and low hydrogen storage efficiency, and achieve good stability and specific surface area The effect of increasing and increasing the adsorption capacity

Active Publication Date: 2020-12-08
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor stability and low hydrogen storage efficiency of two-dimensional black phosphorus nanosheets, and to provide a method for preparing and storing calcium-doped two-dimensional black phosphorus crystal nanosheets. The method of the present invention can simultaneously passivate - Stabilize two-dimensional black phosphorus nanosheets and improve their hydrogen storage performance, and can effectively improve the chemical stability of two-dimensional black phosphorus nanosheets, and achieve mild and efficient hydrogen storage

Method used

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  • Preparation and hydrogen storage method of calcium-doped modified two-dimensional black phosphorus nanosheet

Examples

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Effect test

Embodiment 1

[0024] This example provides a method for the preparation and hydrogen storage of calcium-doped modified two-dimensional black phosphorus nanosheets, specifically as follows:

[0025] (1) Preparation of Ca-doped BP crystals

[0026] Block BP and elemental calcium were packaged together in a quartz ampoule tube with a length of 20 cm, an inner diameter of 0.8 cm, and a wall thickness of 0.1 cm according to a mass ratio of 10:1. First place the quartz ampoule tube horizontally in the heating furnace, heat it up to 700°C at a rate of 3°C / min, keep it at this temperature for 50 minutes, then cool it down to 480°C, and keep it warm for 2 hours, then slow down at a rate of 3°C / min The temperature was lowered to 140°C, and finally cooled naturally to room temperature to obtain Ca-BP crystals.

[0027] (2) Preparation of Ca-doped modified two-dimensional BP crystal nanosheets (Ca-2D-BP)

[0028] Weigh 30 mg of the Ca-BP crystal prepared in 1 with an electronic balance, transfer it t...

Embodiment 2

[0032] This example provides a method for the preparation and hydrogen storage of calcium-doped modified two-dimensional black phosphorus nanosheets, specifically as follows:

[0033] (1) Preparation of Ca-doped BP crystals

[0034] Block BP and elemental calcium were encapsulated together in a quartz ampoule tube with a length of 20 cm, an inner diameter of 0.8 cm, and a wall thickness of 0.1 cm according to a mass ratio of 30:1. First place the quartz ampoule tube horizontally in the heating furnace, heat it up to 750°C at a speed of 4°C / min, keep it at this temperature for 60min, then cool it down to 500°C, and keep it for 2.5h, then at a speed of 4°C / min Slowly lower the temperature to 150°C, and finally cool naturally to room temperature to obtain Ca-BP crystals.

[0035] (2) Preparation of Ca-doped modified two-dimensional BP crystal nanosheets (Ca-2D-BP)

[0036] Weigh 35 mg of the Ca-BP crystal prepared in 1 with an electronic balance, transfer it to a mortar, add a ...

Embodiment 3

[0040] This example provides a method for the preparation and hydrogen storage of calcium-doped modified two-dimensional black phosphorus nanosheets, specifically as follows:

[0041] (1) Preparation of Ca-doped BP crystals

[0042]Block BP and elemental calcium are encapsulated together in a quartz ampoule tube with a length of 20 cm, an inner diameter of 0.8 cm, and a wall thickness of 0.1 cm according to a mass ratio of 50:1. First place the quartz ampoule tube horizontally in the heating furnace, heat it up to 725°C at a rate of 5°C / min, keep it at this temperature for 70min, then cool it down to 520°C, and keep it for 3h, then slowly at a rate of 5°C / min The temperature was lowered to 160°C, and finally cooled naturally to room temperature to obtain Ca-BP crystals.

[0043] (2) Preparation of Ca-doped modified two-dimensional BP crystal nanosheets (Ca-2D-BP)

[0044] Weigh 40 mg of the Ca-BP crystal prepared in 1 with an electronic balance, transfer it to a mortar, add ...

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Abstract

The invention provides a preparation and hydrogen storage method of a calcium-doped modified two-dimensional black phosphorus nanosheet, which comprises the following steps: encapsulating blocky blackphosphorus (BP) and elemental calcium in a quartz ampoule tube, heating the ampoule tube to 700-750 DEG C, keeping the temperature for 50-70 minutes, cooling theampoule tube to 480-520 DEG C, keepingthe temperature for 2-3 hours, slowly cooling the raw materials to 140-160 DEG C, and finally cooling the raw materials to room temperature to obtain Ca-doped black phosphorus crystal (CaBP); and preparing a calcium element doped black phosphorus crystal dispersion liquid with the concentration of 0.6-1g / L from the prepared calcium element doped black phosphorus crystal by taking NMP (N-methylpyrrolidone) as a dispersing agent, carrying out ultrasonic dispersion, and centrifuging the calcium element doped black phosphorus crystal dispersion liquid to obtain the calcium element doped modifiedtwo-dimensional black phosphorus nanosheet. The two-dimensional black phosphorus nanosheet can be passivated and stabilized at the same time, the hydrogen storage performance of the two-dimensional black phosphorus nanosheet is improved, the chemical stability of the two-dimensional black phosphorus nanosheet can be effectively improved, and mild and efficient hydrogen storage is achieved.

Description

technical field [0001] The invention relates to the technical field of application of environmental nanomaterials in green energy, in particular to a preparation and hydrogen storage method of calcium-doped modified two-dimensional black phosphorus nanosheets. Background technique [0002] Two-dimensional black phosphorus has excellent sheet structure and nano-effects, and is considered to be the most promising post-graphene nanomaterial. Due to the controllable layer dimension of two-dimensional black phosphorus nanosheets, many adsorption vacancies between layers, and strong ability of mild binding and releasing hydrogen, it can be used as a potential functional material for storing green energy hydrogen. However, the environmental stability of two-dimensional black phosphorus is poor, and it is easy to react with oxygen and water at normal temperature and pressure to form phosphate, thereby degrading, which limits its application in the field of hydrogen storage. [0003...

Claims

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Application Information

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IPC IPC(8): C01B25/02B82Y40/00C01B3/00
CPCC01B25/02B82Y40/00C01B3/001Y02E60/32
Inventor 李海波许佳宁李英华张文馨邓宁灿王丽欣张宸溪李赓
Owner NORTHEASTERN UNIV
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