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Three-dimensional ordered bimodal mesoporous carbon supported Pt catalyst and preparation method thereof

A three-dimensional ordered, double mesoporous technology, used in electrical components, battery electrodes, circuits, etc., can solve the problems of low activity and easy poisoning, and achieve the effect of high electrocatalytic activity and simple process

Inactive Publication Date: 2016-07-20
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a dual-mesoporous carbon-supported Pt catalyst material with high activity and good anti-toxic performance and a preparation method thereof for commercial methanol fuel cell catalyst Pt / C catalysts, which have the disadvantages of low activity and easy poisoning.

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  • Three-dimensional ordered bimodal mesoporous carbon supported Pt catalyst and preparation method thereof
  • Three-dimensional ordered bimodal mesoporous carbon supported Pt catalyst and preparation method thereof
  • Three-dimensional ordered bimodal mesoporous carbon supported Pt catalyst and preparation method thereof

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Embodiment 1

[0030] The preparation method of three-dimensional ordered double mesoporous carbon supported Pt catalyst, the steps are as follows:

[0031] 1) Prepare monodisperse silica nanosphere sol with a diameter of 10nm by the improved Stober method: Weigh a certain mass of deionized water, ethanol and lysine into a three-necked flask, stir magnetically at 500rpm, and heat up to 70°C . After stabilization, tetraethyl orthosilicate (TEOS) heated to 70° C. was weighed and mixed with it. The molar ratio of lysine, ethanol, deionized water and TEOS is 1.23:246:9500:61.5x (x=1) After 24 hours of reaction, a silica nanosphere sol with a diameter of 10nm is obtained, and the mass of the nanosphere is sol 7% of mass.

[0032] 2) The silica nanospheres prepared in step 1) were left to stand at 45° C. for 3 days, at which time the solution was completely volatilized, and a bulk silica template self-assembled into a three-dimensional ordered silica nanosphere array was obtained.

[0033] 3) M...

Embodiment 2

[0041] The preparation method of the three-dimensional ordered double mesoporous carbon-supported Pt catalyst, the steps are the same as in Example 1, the difference is that the diameter of the silica spheres in step 1) is 30nm. Monodisperse 30nm silica nanosphere sol with a particle size of 30nm was prepared by the improved Stober method: Weigh a certain mass of deionized water, ethanol and lysine into a three-necked flask, stir magnetically at 500rpm, and heat up to 90°C . After stabilization, weigh the TEOS that has been heated to 90°C and mix it with it. The molar ratio of lysine, ethanol, deionized water and TEOS was 1.23:246:9500:61.5x (x=1). After 24 hours, TEOS was added and reacted for another 24 hours to obtain 30nm silica nanospheres. The final molar ratio of lysine, ethanol, deionized water and TEOS was 1.23:246:9500:61.5x (x=4).

[0042] figure 2 Shown is the SEM picture of the three-dimensional ordered double mesoporous carbon prepared in this example. It can...

Embodiment 3

[0044] The preparation method of the three-dimensional ordered double mesoporous carbon-supported Pt catalyst has the same steps as in Example 1, except that the diameter of the silica spheres in step 1) is 50 nm. The modified Stober method was used to prepare monodisperse silica nanosphere sol with a particle size of 50 nm: Weigh a certain amount of deionized water, ethanol and lysine into a three-necked flask, stir magnetically at 500 rpm, and heat up to 90 °C . After stabilization, weigh the TEOS that has been heated to 90°C and mix it with it. The molar ratio of lysine, ethanol, deionized water and TEOS was 1.23:246:9500:61.5x (x=1). After 24 hours, TEOS was added and reacted for another 24 hours to obtain 50 nm silica nanospheres. The final molar ratio of lysine, ethanol, deionized water and TEOS was 1.23:246:9500:61.5x (x=8).

[0045] Figure 4 The X-ray diffraction pattern (XRD) of the three-dimensional ordered bi-mesoporous carbon-supported Pt catalyst (50 wt% Pt lo...

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Abstract

The invention relates to a three-dimensional ordered bimodal mesoporous carbon supported Pt catalyst and a preparation method thereof. The catalyst comprises carbon support materials and, by weight, 20 percent-50 percent of supported Pt particles, wherein the carbon support materials have bimodal mesoporous structures, namely containing three-dimensional ordered macro mesoporous structures with pore size of 10-50nm and micro mesoporous structures with pore size of 2-6nm on the wall of the macro mesoporous structures. The three-dimensional ordered bimodal mesoporous carbon supported Pt catalyst has high catalytic activity and poison resistance. Compared with commercialized Pt / C catalysts, the catalytic activity is increased by 5.6 times, and the poison resistance is increased by 1.5 times. In addition, according to the preparation method, the process is simple and the pore size of macro mesoporous can be adjusted.

Description

technical field [0001] The invention relates to a preparation method of a three-dimensional ordered double mesoporous carbon-supported Pt nanoparticle catalyst, belonging to the technical field of Pt catalysts. Background technique [0002] As the world's energy crisis is becoming more and more serious and the ecological environment is deteriorating, how to fully develop and utilize clean new energy to achieve low-carbon emission reduction has become a topic of common concern to mankind. Direct Methanol Fuel Cells (DirectMethanolFuelCells, DMFC), with its advantages of high energy density, high conversion efficiency, and no pollution, has become a hot spot in the development and research of new energy fields. In recent decades, DMFC research has made remarkable progress, but the real commercialization and popularization have not yet been realized. One of the key technologies to realize the efficient and continuous conversion of the chemical energy of methanol fuel into elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/88H01M4/926Y02E60/50
Inventor 张程伟张昕张永光殷福星
Owner HEBEI UNIV OF TECH