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Preparation method of binary palladium-platinum core-shell oxygen reduction catalyst with high catalytic activity

A technology with high catalytic activity and core-shell structure, which is applied in the field of preparation of highly catalytically active binary palladium-platinum core-shell structure oxygen reduction catalyst, can solve the problems of low utilization rate of platinum and low catalytic activity of oxygen reduction, and improve utilization efficiency, broad application prospects, and good oxygen reduction catalytic ability

Inactive Publication Date: 2014-06-18
ZHEJIANG OCEAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a binary palladium-platinum core-shell structure oxygen reduction catalyst with high catalytic activity in view of the shortcomings of low oxygen reduction catalytic activity and low platinum utilization rate of ordinary platinum nano-catalysts

Method used

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  • Preparation method of binary palladium-platinum core-shell oxygen reduction catalyst with high catalytic activity
  • Preparation method of binary palladium-platinum core-shell oxygen reduction catalyst with high catalytic activity
  • Preparation method of binary palladium-platinum core-shell oxygen reduction catalyst with high catalytic activity

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Embodiment 1

[0021] Weigh 0.04896gK 2 PdCl 4 Dissolve 0.5355gKBr in 3ml water to form K 2 PdCl 4 For an aqueous solution with a concentration of 0.05mol / L and a concentration of KBr of 1.5mol / L, weigh 0.167g of PVP and dissolve it in 4ml of ethylene glycol to prepare a 0.375M (based on monomer) solution. K 2 PdCl 4 +KBr solution and PVP ethylene glycol solution were added to ethylene glycol within 2.5 minutes at the same time, and the reaction solution turned black after 10 minutes, indicating that K 2 PdCl 4 was reduced to Pd, the reaction solution was incubated at 100°C for 1 hour, then heated to 120°C, and 0.4MH was added after holding for 30 minutes 2 PtCl 6 0.5ml, 0.375MPVP ethylene glycol solution 1ml, heat up to 197°C for 1h. After the reaction, the sample was separated by centrifugation, cleaned by alcohol ultrasonically for 6 times, added 0.05g of VulcanXC-72R carbon powder, dispersed by ultrasonic, and dried by centrifugal.

[0022] figure 1 The TEM morphology and EDX s...

Embodiment 2

[0031] Weigh 0.04896gK 2 PdCl 4 Dissolve 1.06gKBr in 3ml water to form K 2 PdCl 4 For an aqueous solution with a concentration of 0.05mol / L and a concentration of KBr of 3mol / L, weigh 0.167g of PVP and dissolve it in 4ml of ethylene glycol to prepare a 0.375M (based on monomer) solution. K 2 PdCl 4 +KBr solution and PVP ethylene glycol solution were added to ethylene glycol within 2.5 minutes at the same time, and the reaction solution turned black after 30 minutes, indicating that K 2 PdCl 4 was reduced to Pd, the reaction solution was incubated at 80°C for 1 hour and then heated to 120°C, and 0.4MH was added after holding for 30 minutes 2 PtCl 6 0.5ml, 0.375MPVP ethylene glycol solution 1ml, heat up to 197°C for 1h. After the reaction, the sample was separated by centrifugation, cleaned by alcohol ultrasonically for 6 times, added 0.05g of VulcanXC-72R carbon powder, dispersed by ultrasonic, and dried by centrifugal.

[0032] Weigh 5mg of the catalyst, disperse it i...

Embodiment 3

[0035] Weigh 0.04896gK 2 PdCl 4 Dissolve 0.35gKBr in 3ml water to form K 2 PdCl 4 For an aqueous solution with a concentration of 0.05mol / L and a concentration of KBr of 1mol / L, weigh 0.167g of PVP and dissolve it in 40ml of ethylene glycol to prepare a 0.0375M (based on monomer) solution. K 2 PdCl 4 +KBr solution and PVP ethylene glycol solution were added to ethylene glycol within 2.5 minutes at the same time, and the reaction solution turned black after 3 minutes, indicating that K 2 PdCl 4 was reduced to Pd, the reaction solution was incubated at 100°C for 1 hour, then heated to 120°C, and 0.4MH was added after holding for 30 minutes 2 PtCl 6 0.5ml, 0.0375MPVP ethylene glycol solution 10ml, heat up to 180°C for 3h. After the reaction, the sample was separated by centrifugation, cleaned by alcohol ultrasonically for 6 times, added 0.05g of VulcanXC-72R carbon powder, dispersed by ultrasonic, and dried by centrifugal.

[0036] Weigh 5mg of the catalyst, disperse it ...

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Abstract

A preparation method of a binary palladium-platinum core-shell oxygen reduction catalyst with a high catalytic activity is characterized by comprising the following steps: heating a certain amount of glycol to a temperature of 80 to 120 DEG C, maintaining the temperature for 20 to 40 minutes; preparing a K2PdCl4+KBr water solution and a PVP glycol solution, simultaneously and slowly adding the K2PdCl4+KBr water solution and PVP glycol solution into the heated glycol solution, maintain the temperature for 50 to 70 minutes; heating the reaction solution to a temperature of 120 to 140 DEG C, maintaining the temperature for 20 to 40 minutes, adding a chloroplatinic acid glycol solution and the PVP glycol solution; heating to a temperature of 160 to 197 DEG C, maintaining the temperature for 50 to 70 minutes; subjecting the reaction product to a centrifugation separation treatment, then subjecting the reaction product to several times of ultrasonic cleaning; adding carbon powder according to a certain stoichiometric ratio. The core-shell binary palladium-platinum catalyst has a better oxygen reduction catalyzing performance than that of conventional platinum catalysts. Moreover, in this core-shell binary palladium-platinum catalyst, the precious metal platinum is concentrated on the surface of the catalyst, thus the utilization rate of platinum is improved, and the catalyst cost is reduced. The binary palladium-platinum core-shell oxygen reduction catalyst has a wide application prospect in proton exchange membrane fuel cells.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a preparation method of a binary palladium-platinum core-shell structure oxygen reduction catalyst with high catalytic activity. Background technique [0002] Platinum carbon catalysts have high catalytic activity and excellent acid corrosion resistance, so they are currently the most widely used low-temperature fuel cell catalysts. However, due to the high price of Pt and the lack of resources, the cost of fuel cells remains high and has become a restrictive fuel. An important factor in commercialization. The introduction of the second component in the unit catalyst can tune the electronic structure of the catalyst surface and change the binding energy between platinum surface atoms and adsorbed species. This effect mainly depends on two effects: the strain effect and the ligand effect. The strain effect refers to the difference in bond length between the doped atoms and ...

Claims

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Application Information

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IPC IPC(8): B01J23/44H01M4/92
CPCY02E60/50
Inventor 井少杰刘永刚孔令民王世来姚建明李鹏乔倩吴萌萌
Owner ZHEJIANG OCEAN UNIV
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