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Nano cobalt phosphide-porous carbon nanofiber flexible membrane and preparation method thereof

A nanofiber membrane and nanofiber technology, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as single structure and small specific surface area, and achieve simple preparation process and large specific area. Effect of surface area, mild conditions

Inactive Publication Date: 2018-02-23
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional carbon nanofibers have a small specific surface area and a single structure, so there is still a lot of room for improvement.

Method used

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  • Nano cobalt phosphide-porous carbon nanofiber flexible membrane and preparation method thereof
  • Nano cobalt phosphide-porous carbon nanofiber flexible membrane and preparation method thereof
  • Nano cobalt phosphide-porous carbon nanofiber flexible membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, concrete steps are:

[0038] (1) First, the porous carbon nanofiber membrane was prepared by electrospinning, and the specific steps were as follows:

[0039] Add 0.6g polystyrene (PS) and 1g polyacrylonitrile (PAN) together to 10mL N,N - In dimethylformamide, the precursor spinning solution was prepared by stirring in a water bath at 80°C.

[0040] The prepared spinning solution was injected into a 5 mL syringe with a needle diameter of 0.5 mm for electrospinning. The specific spinning parameters were: voltage 20 kV, injection speed 1.5 mL h -1 , the receiving distance is 15 cm.

[0041] The prepared polyacrylonitrile / polystyrene fiber membrane was pre-oxidized in an air atmosphere at 250 °C, and the pre-oxidation time was 2 h.

[0042] The pre-oxidized polyacrylonitrile / polystyrene fiber membrane was heated at 5 °C for min in an argon atmosphere. -1 The heating rate is to rise to 800°C for carbonization, and the carbonization time is 2 h. The obtain...

Embodiment 2

[0050] The amount of cobalt acetate in Example 1 was changed to 0.4 mmol, and the rest were the same as in Example 1, and the hybrid material finally obtained was recorded as CoP / PCNF-0.4. The component material at 0.5 M H 2 SO 4 An overpotential of 83mV is required to achieve 10 mA cm in -2 the current density.

Embodiment 3

[0052] The amount of cobalt acetate in Example 1 was changed to 0.6 mmol, and the rest were the same as in Example 1, and the hybrid material finally obtained was recorded as CoP / PCNF-0.6. The component material at 0.5 M H 2 SO 4 An overpotential of 97mV is required to reach 10 mA cm in -2 the current density.

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Abstract

The invention belongs to the technical field of nano hybrid materials and particularly relates to a nano cobalt phosphide-porous carbon nanofiber flexible membrane and a preparation method thereof. The nano cobalt phosphide-porous carbon nanofiber flexible membrane is prepared by: growing cobalt oxide nanoparticles in situ on porous carbon nanofibers having novel pore structure and converting theresultant to cobalt phosphide via gaseous reaction. The preparation method comprises: preparing a polyacrylonitrile / polystyrene nanofiber membrane via an electrospinning process; preparing a porous carbon nanofiber flexible membrane with novel pore structure by high-temperature carbonization; growing cobalt oxide nanoparticles in situ on the porous carbon nanofibers via a one-step hydrothermal process; converting the cobalt oxide nanoparticles into cobalt phosphide nanoparticles via gaseous reaction. The nano cobalt phosphide-porous carbon nanofiber flexible membrane and the preparation methodthereof have the advantages that operations are simple, the conditions are mild, the membrane is suitable for large-scale production, and the cobalt phosphide-porous carbon nanofiber hybrid materialprepared herein is an efficient flexible all-pH hydrogen evolution reaction catalyst membrane material.

Description

technical field [0001] The invention belongs to the technical field of nano-hybrid materials, and in particular relates to a cobalt phosphide-porous carbon nanofiber hybrid material and a preparation method thereof. Background technique [0002] Due to its environmental friendliness, harmless products and renewable characteristics, hydrogen is considered to be one of the most potential new clean energy sources. Electrochemical hydrogen evolution reaction (HER) is one of the main ways to obtain hydrogen energy, so high-performance hydrogen evolution reaction catalysts are very important. At present, the best-performing HER catalysts are metal platinum-based catalysts. Although this type of catalyst has high catalytic activity, its stability is poor and its cost is high, which cannot meet the requirements of large-scale applications. In addition, powdered HER catalysts are not suitable for some special occasions. [0003] Cobalt phosphide (CoP) is a typical transition metal ...

Claims

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Application Information

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IPC IPC(8): B01J27/185C25B1/02C25B11/04
CPCC25B1/02B01J27/1853C25B11/091B01J35/59B01J35/33
Inventor 刘天西鲁恒毅樊玮郜伟左立增
Owner FUDAN UNIV
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