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Electrochemical in-situ purifying process of carbon base nanometer electrocatalyst material

A technology of carbon-based nanomaterials and electrocatalysts, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., to achieve short cycle, simple operation, and good effect

Inactive Publication Date: 2007-03-21
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The problem to be solved by the present invention is to provide an electrochemical in-situ purification method for carbon-based nanomaterial electrocatalysts, to overcome the various defects of existing purification methods, and to obtain a simple, efficient and non-destructive carbon-based nanomaterial. In situ purification and activation method of nanomaterial microstructure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 0.1 gram of carbon nanotubes containing 0.43wt% iron metal nanoparticles, add 0.9 gram of water to make the mass percentage of carbon nanofiber A obtained through ultrasonic dispersion be 10%, weigh 0.25 gram of carbon nanotubes containing 60% polytetrafluoroethylene Add 2.25 g of water to the polytetrafluoroethylene emulsion, and dilute it into a polytetrafluoroethylene solution B with a mass percentage of 6%. In a water bath at 80°C, put the mixed liquid A in a beaker, and gradually add the solution B under vigorous stirring. Continue to stir until a gel forms. Afterwards, the obtained jelly was uniformly coated on the nickel foam, and pressed into a tablet at 250° C. under a pressure of 5 MPa to obtain an unpurified carbon nanofiber electrocatalyst.

[0026] The prepared carbon nanofiber electrocatalyst was placed in 2M HNO 3 in solution. The cyclic voltammetry scan was carried out in the range of 1.0V to -1.0V, the scan speed was 0.1V / s, and the number of s...

Embodiment 2

[0028] Take by weighing 0.1 gram of nano-carbon fiber containing 1% nickel and iron metal nanoparticles, add 0.4 gram of water, make the mass percentage of nano-carbon fiber A obtained through ultrasonic dispersion be 20%, weigh 0.25 gram of 60wt% polytetrafluoroethylene Add 2.25 g of water to the polytetrafluoroethylene solution, and dilute it into 6 wt% polytetrafluoroethylene solution B. In a water bath at 80°C, put A in a beaker, and gradually add solution B under vigorous stirring. Continue to stir until a gel forms. Afterwards, the obtained jelly was evenly coated on the nickel foam, and pressed into a tablet at 250° C. under a pressure of 5 MPa to obtain an unpurified carbon nanofiber electrocatalyst.

[0029] Put the prepared carbon nanofiber electrocatalyst into the carefully deaerated 3M HNO 3 in solution. The cyclic voltammetry scan was carried out in the range of 1.0V to -1.0V, the scan speed was 0.1V / s, and the number of scans was 100 times. After that, the el...

Embodiment 3

[0031] Weigh 5 mg of carbon nanofibers containing 7 wt % iron metal nanoparticles and directly add 1 ml of 0.5 wt % Nafion solution. After ultrasonic dispersion, 10 μL of the mixed liquid was dropped on a glassy carbon electrode with a diameter of 3 mm using a pipette gun, and then dried naturally in an air atmosphere for 1 h. Obtain the required nano-carbon fiber electrocatalyst.

[0032] Put the prepared carbon nanofiber electrocatalyst into 2M H 2 SO 4 in solution. The cyclic voltammetry scan was carried out in the range of 1.0V to -1.0V, the scan speed was 0.1V / s, and the number of scans was 100 times. After that, the electrocatalyst was washed with ultrapure water, and the metal content of carbon nanofibers after in situ purification and activation was determined by EDS. EDS analysis showed that the carbon nanofibers activated in situ could not detect the presence of iron.

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Abstract

The present invention discloses electrochemical in-situ purifying process of carbon base nanometer electrocatalyst material. Through electrochemical in-situ purifying and activating process, the transition metal catalyst contained in the carbon base nanometer material is in-situ purified and activated. The nanometer metal particles on the carbon base nanometer material are eliminated while maintaining the micro structure and electrocatalytic performance of the carbon base nanometer material without destruction. The present invention has the features of simple operation, low cost, short purifying period, and no destruction on the micro structure and performance of the carbon base nanometer material.

Description

technical field [0001] The invention relates to an electrochemical in-situ purification method of a carbon-based nano material electrocatalyst. Background technique [0002] Carbon-based nanomaterials, including one-dimensional, two-dimensional and three-dimensional carbon-based nanomaterials such as carbon nanotubes, carbon nanofibers, carbon nanohorns, and carbon nanomolecular sieves, have unique physical and chemical properties. Materials and heterogeneous catalyst supports and other fields have shown good application prospects. It is particularly important that carbon-based nanomaterials have excellent acid and alkali resistance and thermal stability, large specific surface area and suitable pore size distribution, good mechanical strength and excellent electrical conductivity, and have great potential as electrocatalysts and electrocatalyst supports. potential. [0003] From the point of view of the preparation methods of carbon-based nanomaterials, the main preparati...

Claims

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Application Information

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IPC IPC(8): B01J21/18C25F1/00C01B31/02
Inventor 郑俊生张新胜史磊袁渭康
Owner EAST CHINA UNIV OF SCI & TECH
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