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Noble metal-titanium dioxide nano fiber complex and preparation method and application thereof

A technology of nanofibers and titanium dioxide, which is applied in the field of fuel cell catalyst preparation, can solve the problems of complex pretreatment of carbon nanotubes, and achieve the effects of high yield, narrow distribution, and high electrocatalytic activity

Inactive Publication Date: 2011-07-20
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been many reports on the preparation of polymer-protected metal nanoparticles by the microwave reduction method, and there are also reports on the carbon nanotubes loaded with Pt particles by the microwave reduction method, but this method requires more complicated pretreatment of the carbon nanotubes.

Method used

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  • Noble metal-titanium dioxide nano fiber complex and preparation method and application thereof
  • Noble metal-titanium dioxide nano fiber complex and preparation method and application thereof
  • Noble metal-titanium dioxide nano fiber complex and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 1.5g of isopropyl orthotitanate to a mixed solution of 3ml of ethanol and 3ml of acetic acid, stir well, then add to 7.5ml of ethanol dissolved with 0.45g of polyvinylpyrrolidone (PVP number average molecular weight 1,300,000), and stir magnetically for 15 minute. Inhale the resulting mixed solution into a plastic syringe with a flow rate of 4ml / h. The stainless steel needle is connected to the cathode of the high-voltage power supply, and the metal plate covered with aluminum platinum as the product receiver is connected to the anode of the high-voltage power supply. The voltage is set to 30,000 Volts, the distance from the needle to the receiving board is 25cm. After the reaction is completed, the obtained fiber mat is calcined at 500 degrees for 4 hours to remove the organic matter in the product, that is, to obtain TiO 2 fiber products.

[0021] Then take 0.2g of the above-mentioned TiO 2 Fiber products, dispersed in 27.2ml ethylene glycol solution, then add ...

Embodiment 2

[0023] Add 1.5g of isopropyl orthotitanate to a mixed solution of 3ml of ethanol and 3ml of acetic acid, stir well, then add to 7.5ml of ethanol dissolved with 0.45g of polyvinylpyrrolidone (PVP number average molecular weight 1,300,000), and stir magnetically for 15 minute. Inhale the resulting mixed solution into a plastic syringe with a flow rate of 4ml / h. The stainless steel needle is connected to the cathode of the high-voltage power supply, and the metal plate covered with aluminum platinum as the product receiver is connected to the anode of the high-voltage power supply. The voltage is set to 30,000 Volts, the distance from the needle to the receiving board is 25cm. After the reaction is completed, the obtained fiber mat is calcined at 500 degrees for 4 hours to remove the organic matter in the product, that is, to obtain TiO 2 fiber products.

[0024] Then take 0.2g of the above-mentioned TiO 2 Fiber products, dispersed in 40.9ml ethylene glycol solution, then add ...

Embodiment 3

[0026] Add 1.5 g of ethyl orthotitanate to a mixed solution of 5 ml of ethanol and 5 ml of acetic acid, stir well, then add 0.78 g of polyvinylpyrrolidone (PVP number average molecular weight 1,300,000) in 9 ml of ethanol, and stir magnetically for 25 minutes. Inhale the resulting mixed solution into a plastic syringe with a flow rate of 6ml / h. The stainless steel needle is connected to the cathode of the high-voltage power supply, and the metal plate covered with aluminum platinum as the product receiver is connected to the anode of the high-voltage power supply. The voltage is set to 25,000 Volts, the distance from the needle to the receiving board is 18cm. After the reaction is completed, the obtained fiber mat is calcined at 500 degrees for 4 hours to remove the organic matter in the product, that is, to obtain TiO 2 fiber products.

[0027] Then take 0.2g of the above-mentioned TiO 2 Fiber products, dispersed in 20ml of glycerol solution, then add 2.5ml of 0.07mol / L H ...

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Abstract

The invention discloses a noble metal-titanium dioxide nano fiber complex and a preparation method and application thereof. The method comprises the following steps of: 1) mixing solution of titanate and solution of polyvinyl pyrrolidone uniformly to form electrostatic spinning stock solution, performing electrostatic spinning to obtain TiO2 nano fibers, and calcining the TiO2 nano fibers to obtain anatase TiO2 nano fibers; and 2) dispersing the anatase TiO2 nano fibers into alcohol, adding noble metal salt solution, mixing the solution uniformly, and performing intermittent microwave heatingto obtain the noble metal-titanium dioxide nano fiber complex. The noble metal-titanium dioxide nano fiber complex provided by the invention has small granule diameter (5 nanometers) and narrow granule distribution, the granules are dispersed high and aggregated, the noble metal content can be randomly controlled from 5 to 60 percent, and the complex has high electric catalytic activity and can be used as an electric catalyst for a fuel cell oxide electrode.

Description

technical field [0001] The invention belongs to the field of preparation of fuel cell catalysts, and relates to a noble metal-titanium dioxide nanofiber composite and its preparation method and application. Background technique [0002] Proton exchange membrane fuel cells (PEM fuel cells) can operate at relatively low temperatures (approximately 80°C), allowing fast start-up (shorter warm-up time is required), so system components wear less and have better durability . The electrocatalytic process for PEM fuel cell applications is the oxidation of hydrogen at the anode and the reduction of oxygen in the air at the cathode. The commonly used electrocatalysts in PEM fuel cell systems are platinum / carbon catalysts or platinum alloy / carbon catalysts. Carbon with high specific surface area is used to support highly dispersed nano-sized platinum, smoothly transports reactants and products of fuel cell reactions, and has good electrical conductivity. Before automotive fuel cell ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90B01J23/38B01J21/06B01J23/42H01M8/10
CPCY02E60/522Y02E60/50
Inventor 江龙隆琪李津如荣惠林
Owner INST OF CHEM CHINESE ACAD OF SCI
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