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Preparation method of core-shell structure Te @ metal electrooxidation catalyst

A core-shell structure and catalyst technology, applied in the field of electrochemistry, can solve the problems of large difference in reduction potential, difficulty of PtRu alloy, high cost of platinum and palladium, and achieve the improvement of electron transport rate, good methanol oxidation performance, and improved catalytic activity. Effect

Inactive Publication Date: 2019-07-26
YANGZHOU UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the PtRu catalyst is recognized as the most promising anode catalyst for liquid fuel cells. The addition of Ru can effectively reduce the overpotential of methanol oxidation and greatly improve the CO poisoning ability of Pt. However, the properties of Pt and Ru are different. For example, the large difference in reduction potential and lattice mismatch make it difficult to prepare highly dispersed PtRu alloys.
[0003] Chinese patent application CN103537280A discloses a Pd@Pt core-shell catalyst for methanol oxidation. Although the catalyst exhibits excellent electrocatalytic performance and durability, the cost of platinum and palladium in the material preparation process is too high to Realize large-scale application
Document 1 uses Te as the hard template and uses a large amount of Pt (Te:Pt atomic ratio as high as 1:10). Although it has considerable electro-oxidation performance, the performance of a single Pt active site has not been maximized. Preparation High cost and not in line with the concept of mass production (ACS Appl. Mater. Interfaces2016, 8, 16147-16153)
The use of non-noble metal Cu-doped PtTe nanotubes also faces problems such as high content of Pt and long synthesis period during the synthesis process, and Pt and PtTe are obtained in the material structure. 2 The mixed species of Pt is not conducive to stimulating the best alcohol electrooxidation performance of Pt (Journal of Alloys and Compounds 770(2019)76-81)

Method used

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  • Preparation method of core-shell structure Te @ metal electrooxidation catalyst
  • Preparation method of core-shell structure Te @ metal electrooxidation catalyst
  • Preparation method of core-shell structure Te @ metal electrooxidation catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Preparation of core-shell structure Te@Pt(8:1:50)-150℃-3h electrooxidation catalyst:

[0054] In the first step, 230 mg of sodium tellurite, 450 mg of ascorbic acid, and 100 mg of polyvinylpyrrolidone were sequentially added to a 100 mL flat-bottomed flask containing 30 mL of ethylene glycol, and stirred at room temperature until uniformly mixed. The above solution was transferred to a Teflon substrate with a volume of 100 mL, and the temperature of the oven was set at 150° C., and the holding time was 6 h. After the reaction was completed and cooled to room temperature, it was washed with deionized water, acetone, and ethanol several times, filtered by suction, and vacuum-dried to obtain a silvery white glossy substance, which was tested by a powder XRD diffractometer and the sample was Te, which was used for the next experiment.

[0055] The second step, at room temperature, sequentially 16mgTe, 66uLH 2 PtCl 6 The solution (Pt: 30 mg / mL) and 100 mg of polyvinylpyrro...

Embodiment 2

[0063] Preparation of core-shell structure Te@Pt(8:1:300)-150℃-3h electro-oxidation catalyst: at room temperature, take Te 16mg prepared in Example 1, 66uLH 2 PtCl 6 The solution (Pt: 30mg / mL) and 600mg of polyvinylpyrrolidone were added to a 250mL flat-bottomed flask containing 100mL of ethylene glycol, and magnetically stirred until uniformly mixed. The reaction temperature was adjusted to 150° C. by means of oil bath heating, and the holding time was 3 hours. Cool to room temperature, wash and dry to obtain a core-shell structure Te@Pt (8:1:300)-150°C-3h electro-oxidation catalyst.

[0064] Figure 7 The XRD pattern of the core-shell structure Te@Pt(8:1:300)-150°C-3h electrooxidation catalyst prepared in Example 2, it can be seen from the figure that the main characteristic peaks of Te still exist, and there are also Pt peaks. Three characteristic peaks at 39.7°, 46.2° and 67.4° correspond to the (111), (200) and (220) crystal planes of Pt, respectively, indicating the f...

Embodiment 3

[0068] Preparation of core-shell structure Te@Pt(8:1:50)-150℃-6h electrooxidation catalyst: at room temperature, sequentially take Te16mg prepared in the first step of Example 1, 66uLH 2 PtCl 6 The solution (Pt: 30mg / mL) and 100mg of polyvinylpyrrolidone were added to a 250mL flat-bottomed flask containing 100mL of ethylene glycol, and magnetically stirred until uniformly mixed. Using oil bath heating method, adjust the reaction temperature to 150°C, and the holding time is 6h. Cool to room temperature, wash and dry to obtain a core-shell structure Te@Pt (8:1:50)-150°C-6h electro-oxidation catalyst.

[0069] Figure 10 The XRD pattern of the core-shell structure Te@Pt(8:1:50)-150°C-6h electro-oxidation catalyst prepared in Example 3, it can be seen from the figure that the catalyst has three obvious Pt characteristic peaks , corresponding to the (111), (200) and (260) crystal planes of Pt at 39.7°, 46.2° and 67.4°, respectively, indicating the formation of Pt.

[0070] F...

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Abstract

The invention discloses a preparation method of a core-shell structure Te @ metal electrooxidation catalyst. According to the method, a hard template Te is taken as a core, and noble metal Pt, Pd or an alloy thereof are taken as a shell, and polyvinylpyrrolidone is added, so as to obtain the core-shell structure Te @ metal electrooxidation catalyst by adopting an oil bath heating mode. The Te @ metal electrooxidation catalyst disclosed by the invention is relatively low in noble metal content and has excellent alcohol oxidation performance, wherein the mass activity in the anodic oxidation reaction of a liquid fuel cell is far higher than that of a commercial Pt-based catalyst, and the catalyst can be applied to the field of liquid fuel cells as a high-efficiency electrocatalyst.

Description

technical field [0001] The invention relates to a preparation method of a core-shell structure Te@metal electrooxidation catalyst, which belongs to the technical field of electrochemistry. Background technique [0002] As a power generation device that can directly convert chemical energy into electrical energy, fuel cells have attracted widespread attention from fuel cell researchers due to their potential high efficiency, simple design, and direct conversion of internal fuels. At present, the PtRu catalyst is recognized as the most promising anode catalyst for liquid fuel cells. The addition of Ru can effectively reduce the overpotential of methanol oxidation and greatly improve the CO poisoning ability of Pt. However, the properties of Pt and Ru are different. For example, the large difference in reduction potential and lattice mismatch make it difficult to prepare highly dispersed PtRu alloys. [0003] Chinese patent application CN103537280A discloses a Pd@Pt core-shell...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92B82Y40/00
CPCB82Y40/00H01M4/8825H01M4/921H01M4/925Y02E60/50
Inventor 冯立纲杨旭东
Owner YANGZHOU UNIV
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