Titanium dioxide-carbon composite carrier supported platinum electrocatalyst and preparation method thereof

A technology of titanium dioxide and electrocatalyst, which is applied in the field of electrocatalysis, can solve the problems that the reactants are not easy to reach the surface of the catalyst and the low utilization rate of platinum, and achieve the effects of promoting oxygen reduction activity and stability, improving stability, and reducing Pt loading

Active Publication Date: 2018-10-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main reasons for the low utilization rate of platinum include large platinum particles in the electrocatalyst, too few platinum atoms exposed on the surface, and the reactants are difficult to reach the surface of the catalyst, etc.

Method used

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  • Titanium dioxide-carbon composite carrier supported platinum electrocatalyst and preparation method thereof
  • Titanium dioxide-carbon composite carrier supported platinum electrocatalyst and preparation method thereof
  • Titanium dioxide-carbon composite carrier supported platinum electrocatalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0050] This embodiment provides a titanium dioxide-carbon composite carrier-supported platinum electrocatalyst, and the specific steps of the preparation method of the electrocatalyst are as follows:

[0051] (1) Weigh 1 g of commercial carbon black and put it into a round bottom flask, then add 500 mL of hydrochloric acid aqueous solution, then put the round bottom flask into an oil bath at 120°C and heat for 8 h, wash and dry after the reaction, and grind it into powdery carbon black.

[0052] (2) Put the powdered carbon black obtained in step (1) into a round-bottomed flask, then add 500mL of dilute nitric acid solution, then put the round-bottomed flask into a 120°C oil bath to heat for 8h, wash and dry after the reaction, and grind into In powder form, acid-treated carbon black is obtained.

[0053] (3) Weigh 500 mg of acid-treated carbon black obtained in step (2) and disperse it in 30 ml of water, and ultrasonically disperse to obtain a dispersion. Then, 3 mL of n-buty...

Embodiment 2

[0056] The raw materials and steps of this example and Example 1 are the same, the difference is that the temperature of calcination in step (3) is 300 ° C, and the obtained titanium dioxide-carbon composite carrier supports platinum electrocatalyst Pt / TiO 2 -C is recorded as Pt / TiO 2 -C-300.

Embodiment 3

[0058] The raw materials and steps of this example and Example 1 are the same, the difference is that the temperature of calcination in step (3) is 500 ° C, and the obtained titanium dioxide-carbon composite carrier supports platinum electrocatalyst Pt / TiO 2 -C is recorded as Pt / TiO 2 -C-500.

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Abstract

The invention provides a titanium dioxide-carbon composite carrier supported platinum electrocatalyst and a preparation method thereof. The titanium dioxide-carbon composite carrier supported platinumelectrocatalyst comprises a titanium dioxide-carbon carrier and platinum particles, wherein the titanium dioxide-carbon carrier is carbon black loaded with titanium dioxide on the surface, and the platinum particles are loaded on the surface of titanium dioxide. The titanium dioxide-carbon composite carrier supported platinum electrocatalyst provided by the invention contributes to transferring electrons from the carrier to the catalyst, so that the stability of the catalyst activity can be greatly improved. The titanium oxide-carbon composite carrier supported platinum electrocatalyst is prepared by liquid phase assembly and photochemical deposition, and TiO2 can be uniformly loaded on the surface of spherical carbon black. Therefore, the activity of the catalyst is increased.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis, in particular to an electrocatalyst with platinum supported on a titanium dioxide-carbon composite carrier and a preparation method thereof. Background technique [0002] Polymer electrolyte fuel cells have been extensively studied as energy conversion devices due to their non-polluting process and high energy conversion efficiency (~80%). However, the activity and durability of oxygen reduction system electrode materials are still the biggest obstacles to the large-scale commercialization of polymer electrolyte fuel cells. At present, the most commonly used oxygen reduction catalyst is prepared by depositing Pt on the carbon surface, which can reduce the use of noble metal Pt to a certain extent. Although this material has the advantages of low cost and high conductivity, it suffers from the harsh operating conditions of fuel cells and the weak interaction between metals. These disadv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42H01M4/92
CPCB01J23/42H01M4/921H01M4/926Y02E60/50
Inventor 王靖宇许民肖松王泽美李涛
Owner HUAZHONG UNIV OF SCI & TECH
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