Method for preparing carbon nanofiber based non-noble-metal catalyst through oxidation improved electrostatic spinning

A carbon nanofiber and electrospinning technology, which is applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of less parameter description, lower specific surface, poor stability and repeatability of electrospinning, and achieve operational Simple and controllable, good catalytic activity, easy to operate

Inactive Publication Date: 2014-02-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these technologies can obtain catalysts with good performance, non-precious metal catalysts still face some problems: their catalytic activity per unit volume is still not high enough; the price of raw materials for preparation is relatively high; although carbon black with high specific surface area is used, this T

Method used

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  • Method for preparing carbon nanofiber based non-noble-metal catalyst through oxidation improved electrostatic spinning
  • Method for preparing carbon nanofiber based non-noble-metal catalyst through oxidation improved electrostatic spinning
  • Method for preparing carbon nanofiber based non-noble-metal catalyst through oxidation improved electrostatic spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Preparation of iron-containing polyacrylonitrile nanowires by electrospinning

[0047] Configuration solution: Dissolve 5g of polyacrylonitrile in 10g of N,N-dimethylformamide at 50°C, add 3mg of Fe(NO 3 ) 3 9H 2 O Stir well to form a homogeneous clear solution.

[0048] Electrospinning: Fill the prepared solution into the syringe, connect the syringe to the stainless steel needle through the catheter, and control the flow rate of 4mL / h through the micro flow controller to spray the solution through the needle. Aluminum foil was used as the nanofiber collector, and the vertical distance from the needle was 5 cm, and it was grounded at the same time. Connect the needle tube and the aluminum foil to the two poles of the high-voltage generator respectively, and the voltage is 10kV, and the organic nanofibers are started to be obtained on the aluminum foil.

[0049] Observation of the obtained iron-containing polyacrylonitrile nanofibers by scanning electron ...

Embodiment 2

[0050] Example 2: Preparation of iron-containing polyacrylonitrile nanowires by electrospinning

[0051] Configuration solution: Dissolve 2g of polyacrylonitrile in 10g of N,N-dimethylformamide at 50°C, add 0.6mg of Fe(NO 3 ) 3 9H 2 O Stir well to form a homogeneous clear solution.

[0052] Electrospinning: Put the prepared solution into the syringe, connect the syringe to the stainless steel needle through the catheter, and control the flow rate of 1mL / h through the micro flow controller to spray the solution through the needle. Aluminum foil was used as the nanofiber collector, and the vertical distance from the needle was 5 cm, and it was grounded at the same time. Connect the needle tube and the aluminum foil to the two poles of the high-voltage generator respectively, and the voltage is 40kV, and the organic nanofibers are started to be obtained on the aluminum foil.

[0053] Observation of the obtained iron-containing polyacrylonitrile nanofibers by scanning electron...

Embodiment 3

[0054] Example 3: Preparation of iron-containing polyacrylonitrile nanowires by electrospinning

[0055] Configuration solution: Dissolve 0.5g of polyacrylonitrile in 10g of N,N-dimethylformamide at 50°C, add 0.5mg of Fe(NO 3 ) 3 9H 2 O Stir well to form a homogeneous clear solution.

[0056] Electrospinning: Put the prepared solution into the syringe, connect the syringe to the stainless steel needle through the catheter, and control the flow rate of 10mL / h through the micro flow controller to spray the solution through the needle. Aluminum foil was used as the nanofiber collector, and the vertical distance from the needle was 5 cm, and it was grounded at the same time. Connect the needle tube and the aluminum foil to the two poles of the high-voltage generator respectively, and the voltage is 10kV, and the organic nanofibers are started to be obtained on the aluminum foil.

[0057] Observation of the obtained iron-containing polyacrylonitrile nanofibers by scanning elect...

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Abstract

The invention discloses a method for preparing a carbon nanofiber-based non-noble-metal catalyst through oxidation improved electrostatic spinning in the technical field of carbon nanofibers and fuel cell catalysts. The method disclosed by the invention comprises the following steps: dissolving at least one transition metal salt and polyacrylonitrile in a solvent to form a precursor solution; carrying out electrostatic spinning on the precursor solution under certain parameter conditions to obtain iron-containing polyacrylonitrile nanofibers; and heat treating the iron-containing polyacrylonitrile nanofibers in an atmosphere containing a small amount of oxidizing gas to obtain carbon nanofibers containing transition metal and nitrogen element and improved by the small amount of oxidizing gas. According to the method, the cost of the raw materials is low, the operation is convenient and controllable, the operation is easy, the surface structure of the catalyst can be regulated and controlled, and the prepared oxidation improved carbon nanofiber based non-noble-metal catalyst has good catalytic activity on oxygen reduction reaction. The whole preparation process can be combined with a traditional carbon fiber technique, and the method has a prospect that large scale and industrialization of the non-noble metal catalyst can be realized.

Description

technical field [0001] The invention belongs to the technical field of carbon nanofibers and fuel cell catalysts, in particular to a method for preparing carbon nanofiber-based non-precious metal catalysts by oxidation-improved electrospinning. Background technique [0002] Proton exchange membrane fuel cell is a kind of fuel (mainly H 2 , methanol and ethanol, etc.) in a device that converts chemical energy into electrical energy, in which the fuel is oxidized under the action of the negative catalyst and releases electrons to the external circuit, and the generated protons pass through the proton exchange membrane (mainly Membrane, manufactured by DuPont Company) reaches the positive electrode, and oxygen is reduced under the action of the positive electrode catalyst to combine the electrons provided by the external circuit and the protons provided by the proton exchange membrane to form water. This conversion process can achieve a high energy conversion rate because it ...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCY02E60/50H01M4/9083
Inventor 闫星旭罗俊朱静
Owner TSINGHUA UNIV
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