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Pt-TiO2/CNTs catalyst and preparation method thereof

A pt-tio2 and catalyst technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low electrical conductivity, insignificant improvement of catalyst catalytic performance, affecting current density, fuel cell energy and issues such as power density

Inactive Publication Date: 2012-06-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But since TiO 2 It is a semiconductor material, and its conductivity is generally low, so simply put TiO 2 Mixing or doping nanomaterials into methanol catalysts not only does not significantly improve the catalytic performance of the catalyst, but also affects the improvement of current density and the energy and power density of fuel cells.

Method used

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  • Pt-TiO2/CNTs catalyst and preparation method thereof
  • Pt-TiO2/CNTs catalyst and preparation method thereof
  • Pt-TiO2/CNTs catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Take 4ml TiCl 4 The liquid was slowly diluted with distilled water dropwise to a yellow-green transparent solution, and then weighed 0.3g with H 2 SO 4 / HNO 3 The carbon nanotubes (CNTs) obtained by heating the mixed acid under reflux (H 2 SO 4 and HNO 3volume ratio of 3:1, temperature 100°C, time 4h), then add 10ml of ethanol, ultrasonic treatment for 1 hour, add 60ml of 10M NaOH solution dropwise under stirring, continue ultrasonic treatment for 2 hours, and transfer the mixture into a hydrothermal reaction kettle React at 180°C for 18 hours, wash with deionized water and 0.1M HCl solution until neutral, filter, and dry in vacuo.

[0022] 2) Put the dried powder into a quartz boat, raise the temperature to 450° C. under the protection of nitrogen, heat-treat for 2 hours, and take out the heat-treated powder after cooling to room temperature. figure 1 The XRD characterization of the first step shows that the product obtained by hydrothermal is H 2 TiO 3 / CNT...

Embodiment 2

[0029] 1) Take 8ml TiCl 4 The liquid was slowly diluted with distilled water dropwise to a yellow-green transparent solution, and then weighed 0.3g with H 2 SO 4 / HNO 3 The solution was heated to reflux treated carbon nanotubes (CNTs) in it (H 2 SO 4 and HNO 3 volume ratio of 3:1, temperature 100°C, time 4h), then add 10ml of ethanol, ultrasonic treatment for 1 hour, add dropwise 70ml of 10M NaOH solution under stirring, continue ultrasonic treatment for 2 hours, and transfer the mixture into a hydrothermal reaction kettle React at 180°C for 20 hours, wash with deionized water and 0.1M HCl solution until neutral, filter, and dry in vacuo.

[0030] 2) Put the dried powder into a quartz boat, raise the temperature to 450° C. under the protection of nitrogen, and heat-treat for 2 hours. After cooling to room temperature, take out the heat-treated powder and disperse it in 10M NaOH solution, conduct the second hydrothermal reaction at 180°C for 20 hours, wash with deionized ...

Embodiment 3

[0037] 1) Take 4ml TiCl 4 The liquid was slowly diluted with distilled water dropwise to a yellow-green transparent solution, and then weighed 0.45g with H 2 SO 4 / HNO 3 The carbon nanotubes (CNTs) obtained by heating the mixed acid under reflux (H 2 SO 4 and HNO 3 volume ratio of 3:1, temperature 100°C, time 4h), then add 10ml of ethanol, ultrasonic treatment for 1 hour, add 70ml of 10M NaOH solution dropwise under stirring, continue ultrasonic treatment for 2 hours, and then transfer the mixture to hydrothermal reaction React in the kettle at 180°C for 15 hours, wash with deionized water and 0.1M HCl solution until neutral, filter, and dry in vacuum.

[0038] 2) Put the dried powder into a quartz boat, raise the temperature to 450° C. under the protection of nitrogen, and heat-treat for 2 hours. After cooling to room temperature, take out the heat-treated powder and disperse it in 10M NaOH solution, conduct the second hydrothermal reaction at 180°C for 18 hours, wash w...

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Abstract

The invention discloses a Pt-TiO2 / CNTs catalyst, which takes Pt nanoparticles as an active component and TiO2 / CNTs as a compound carrier. The preparation steps are as follows: using TiCl4 and carbon nano tube (CNT) as raw materials, performing hydro-thermal synthesis to obtain a H2TiO3 / CNTs compound, carrying out hot treatment to obtain a TiO2 / CNTs compound under the nitrogen atmosphere, performing secondary hydro-thermal hot treatment on the TiO2 / CNTs compound obtained from the first hot treatment to obtain a TiO2 / CNTs compound carrier, dispersing the TiO2 / CNTs compound carrier in a glycol solution containing sodium acetate and H2PtCl6, heating and refluxing, and loading uniform platinum nanoparticles on the TiO2 / CNTs compound carrier. The Pt-TiO2 / CNTs catalyst obtained in the invention has high and stable electro catalytic activity on oxidization of methanol.

Description

technical field [0001] The invention relates to a fuel cell catalyst and a preparation method thereof, especially Pt-TiO with high catalytic performance for methanol electrochemical oxidation 2 The invention discloses a CNTs catalyst and a preparation method thereof, belonging to the technical field of inorganic materials. Background technique [0002] Direct methanol fuel cells have the advantages of high energy density and environmental friendliness, and have a wide range of applications. Due to its high electrocatalytic activity, metal Pt is widely used as the catalyst active component of fuel cells. However, due to the scarcity and high price of metal Pt resources, in order to improve the utilization rate of noble metal Pt, metal Pt particles are generally supported on carbon materials with large specific surface area, such as activated carbon, XC-72 carbon, carbon nanotubes (CNTs), etc. However, single-component metal Pt catalysts are easily poisoned by intermediate p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J21/06B01J21/18B01J37/10
Inventor 常焜陈卫祥李辉赵杰
Owner ZHEJIANG UNIV
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