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Pt nano particle-carbon nano tube composite material, preparation method and application thereof

A technology of carbon nanotubes and nanoparticles, applied in the field of nanomaterials, can solve the problems of the influence of electrocatalytic properties of composites and the difficulty of controlling Pt

Inactive Publication Date: 2010-01-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this pretreatment method is that it is difficult to control the particle size of Pt and the distribution of PtNPs on the carbon nanotube wall (M.M.Waje, X.Wang, W.Li, Y.Yan, Nanotechnology, 2005 395-400. ), has a great influence on the electrocatalytic properties of the composite

Method used

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  • Pt nano particle-carbon nano tube composite material, preparation method and application thereof

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Effect test

Embodiment 1

[0033] Pristine multi-walled carbon nanotubes (MWCNTs) placed in NH 3 Atmosphere (volume > 99%, 1l / min) tube furnace, heated at 600°C for 3 hours to obtain NH 3 High temperature pretreated MWCNTs (denoted as NH 3 -MWCNTs). Preparation of PtNP-NH 3 -MWCNT complex steps are as follows. First, different contents of NH 3 - The MWCNTs are submerged in an aqueous solution of sodium citrate, stirred after ultrasonication, filtered with suction, and dried to obtain MWCNTs covered with sodium citrate. Then 10ml 2mM H 2 PtCl 6 and 90ml CH 3 The OH mixture was mixed with the above-mentioned MWCNTs covered with sodium citrate and condensed and refluxed in an oil bath at 80 °C for 90 min to obtain PtNP-NH 3 -MWCNT.

[0034] from figure 2 (A, B) It can be seen that PtNPs are uniformly wrapped on the surface of MWCNTs, and hardly any agglomeration of Pt particles is found. Pt-NH can be measured from EDS 3 - The Pt content in MWCNTs is 26 wt%, which is very close to the original ...

Embodiment 2

[0037] Pristine multi-walled carbon nanoparticles (MWCNTs) placed in NH 3 Atmosphere (volume > 99%, 1l / min) tube furnace, heated at 600°C for 3 hours to obtain NH 3 High temperature pretreated MWCNTs. Preparation of PtNP-NH 3 -MWCNT complex steps are as follows. First, 0.01 g of NH 3 - The MWCNTs were submerged in 50ml of 3mM sodium citrate aqueous solution, stirred after ultrasonication, suction filtered, and dried to obtain MWCNTs covered with sodium citrate. Then 10ml 1mM H 2 PtCl 6 and CH 3 The mixture of OH (methanol volume content is 4%) and the above-mentioned MWCNTs covered with sodium citrate were mixed and condensed and refluxed in an oil bath at 80° C. for 90 min to obtain PtNP-MWCNTs. Prepared PtNP-NH 3 -TEM photos of MWCNT composites as Figure 4 shown. PtNPs uniformly cover the outer wall of MWCNTs, and its particle size is about 10 nm.

Embodiment 3

[0039] The acid-treated single-walled carbon nanometers (SWCNTs) were placed in NH 3 Atmosphere (volume > 99%, 1l / min) tube furnace, heated at 1000°C for 2 hours to obtain NH 3 High temperature pretreated SWCNTs (denoted as NH 3 -SWCNTs). Preparation of PtNP-NH 3 -SWCNT complex steps are as follows. First, the NH 3 - The SWCNTs are submerged in an aqueous solution of sodium citrate, stirred after ultrasonication, filtered with suction, and dried to obtain SWCNTs covered with sodium citrate. Then 10ml 2mM H 2 PtCl 6 and 90ml CH 3 The OH mixture was mixed with the above SWCNTs covered with sodium citrate, condensed and refluxed in an oil bath at 80 °C for 90 min to obtain PtNP-NH 3 -SWCNT. Prepared PtNP-NH 3 -TEM photos of SWCNT composites as Figure 5 shown. PtNPs uniformly cover the outer walls of SWCNTs, and their particle size distribution is 2–4 nm.

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Abstract

The invention provides a Pt nano particle-carbon nano tube composite material, a method and an application thereof. The invention is characterized in that ammonia is used for pretreating the carbon nano tube; the carbon nano tube pretreated by the ammonia, sodium citrate, chloroplatinic acid and methanol are used as raw materials; and Pt nano particles are reduced on the outer wall of the carbon nano tube in situ. The weight ratio of the carbon nano tube and chloroplatinic acid, the proportion of the methanol and the sodium citrate and the types of carbon nano tube are improved to obtain the Pt nano particles with smaller particle size and even distribution to wrap the carbon nano tube. The composite material is dispersed in Nafion solution, the mixed solution is dripped on a glassy carbon electrode for natural drying and a thin film modified electrode can be prepared. The electrode has excellent electrocatalytic performance to oxidation reaction of H2O2 and methanol. The method has simple technique, convenient operation, low cost and easy obtaining for the used raw materials, has good application prospect in the electrocatalytic biological sensor and a methanol fuel battery and is applicable to industrial production.

Description

technical field [0001] The invention relates to a Pt nanoparticle-carbon nanotube composite material, a preparation method and application, a composite film modified electrode and a preparation method thereof. The invention is widely used in the fields of electrochemical biosensors, fuel cells and catalysis, and belongs to the field of nanomaterials. Background technique [0002] The unique electrical, chemical and catalytic properties of carbon nanotubes (CNTs) make them widely used in many electrochemical devices, such as amperometric biosensors and fuel cells. In addition, highly dispersed metal catalyst particles such as Pt, Au, Pd, Cu, Ag, etc. have also been reported (K.Balasubramanian, M.Burghard, Analytical and Bioanalytical Chemistry, 2006(385): 452-468.M.Yang, Y.Yang, Y.Liu, G.Shen, R.Yu, Biosensors and Bioelectronics, 2006 (21): 1125-1131.) can be applied in amperometric biosensors and fuel cells, but metal nanoparticles are easy to agglomerate and easily lead to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B1/00B82B3/00G01N27/30B01J23/42
Inventor 高濂张婧孙静
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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