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Preparation method of highly-dispersed precious metal electrocatalyst with high stability and low load capacity

A high-stability, electrocatalyst technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of reduced catalyst stability, difficult anchoring of active component particles, and easy agglomeration of components to improve utilization. , Good anti-poisoning ability, cost reduction effect

Inactive Publication Date: 2018-06-29
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the particle size is small, the active component particles are not easy to anchor on the commonly used carbon support, and the components are easy to agglomerate, resulting in a decrease in catalyst stability.

Method used

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  • Preparation method of highly-dispersed precious metal electrocatalyst with high stability and low load capacity
  • Preparation method of highly-dispersed precious metal electrocatalyst with high stability and low load capacity
  • Preparation method of highly-dispersed precious metal electrocatalyst with high stability and low load capacity

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: the preparation of PtPd / PMC catalyst

[0037] (1) Preparation of nitrogen-doped functionalized carbon support PMC: Dissolve 0.50 g of 1,10-phenanthroline and 0.24 g of nickel chloride hexahydrate in 40 mL of ethanol, add 1 g of carbon powder and disperse uniformly by ultrasonic Then stir for 12 h. The ethanol was then removed by a rotary evaporator, and the resulting black solid was dried at 80 °C for 5 h. The above black solid was calcined in a tube furnace at 800 °C for 2 h under the protection of nitrogen. After cooling to room temperature, add to 0.5M H 2 SO 4 The solution was stirred for 12 h. Then wash with ultra-pure water several times, and then fully dry at 80°C to obtain the nitrogen-doped functionalized carbon carrier PMC.

[0038] (2) Preparation of catalyst precursor: Add 6.9 mg of palladium chloride into a 100 mL round-bottomed flask, add 30 mL of ethylene glycol, stir with a magnet, and sonicate for more than 0.5 hours to completely dis...

Embodiment 2

[0041] Embodiment 2: the preparation of PtRu / PC catalyst

[0042] (1) Preparation of phosphorus-doped functionalized carbon carrier PC: Add 1 g of carbon powder into 20 mL of nitric acid (3M), stir at 90 °C for 2 h, cool to room temperature and wash repeatedly with a large amount of ultrapure water, After drying at 60 °C, the obtained solid and triphenylphosphine were mixed evenly at a mass ratio of 3:1, and the mixture was put into a tube furnace, and calcined in a tube furnace at 900 °C for 2 h under the protection of nitrogen. After cooling to room temperature, washing with ultrapure water several times, and fully drying at 60°C, the phosphorus-doped functionalized carbon support PC was obtained.

[0043] (2) Preparation of catalyst precursor: 65.6 mg of chloroplatinic acid, 33.8 mg of ruthenium trichloride, 240.4 mg of nickel chloride hexahydrate and 380.7 mg of sodium citrate were dissolved in three times of water in a round bottom flask, and stirred for half an hour. Ad...

Embodiment 3

[0046] Embodiment 3: the preparation of Ir / NMC catalyst

[0047] (1) Preparation of nitrogen-doped functionalized carbon support NMC: ultrasonically disperse 0.2 g of Al2O3 in 100 mL of ethanol, then add 2 g of phenolic resin, and stir for 2 h with a magnetic stirrer to fully dissolve it. In addition, 0.5 g of melamine was weighed and dissolved in hot water at 90°C. Then the two solutions were mixed and stirred for 2 h. After drying at 90 °C, the resulting solid was ground and calcined in a tube furnace at 800 °C for 2 h under the protection of nitrogen. After cooling to room temperature, add to 0.5M H 2 SO 4 The solution was stirred for 12 h. Then wash with ultra-pure water several times, and fully dry at 60°C to obtain nitrogen-doped functionalized carbon support NMC.

[0048] (2) Preparation of catalyst precursor: 1.7 mL of iridium chloride solution and 5.6 mg of tin chloride were ultrasonically dissolved in 30 mL of ethanol solution. Then 35 mg sodium citrate was add...

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Abstract

The invention provides a preparation method of a highly-dispersed precious metal electrocatalyst with high stability and a low load capacity. According to the preparation method, low content preciousmetals such as platinum, palladium, ruthenium, iridium, and the like, are taken as the catalytic active components; cheap metals such as iron, tin, cobalt, nickel, copper, and the like, are taken as sacrificial metals; alloy particles are synthesized through a hydrothermal method, an alcohol reduction method, or a hydrazine reduction method; then alloy particles are loaded on a heteroatom doped functionalized carbon carrier through the anchoring effect of the functionalized carbon carrier so as to obtain a catalyst precursor; then the catalyst precursor is soaked in an acid to dissolve the sacrificial metals, the alloy particles are cracked, the precious metals are left on the heteroatom doped functionalized carbon carrier, and the precious metal catalyst with a highly dispersed structureis obtained. The precious metal catalyst has an excellent catalytic performance, moreover, the loading amount of precious metals is greatly reduced, the utilization rate of precious metals is largelyincreased, the catalyst cost is effectively reduced, and the contradiction between the performance and cost is solved.

Description

technical field [0001] The present invention relates to the preparation of a noble metal electrocatalyst, in particular to a preparation method of a high-stability, low-load ultra-dispersed noble metal electrocatalyst, which is applied to the oxidation, oxygen reduction, hydrogen evolution, and oxygen evolution of small molecule alcohols in fuel cells As well as carbon dioxide reduction and other aspects, it belongs to the technical field of composite materials and the technical field of electrocatalysis. Background technique [0002] With the increasingly severe energy problems and environmental problems caused by burning coal and other fossil fuels, the research and development of clean energy has been paid more and more attention by governments and scientific circles all over the world. In order to solve this global problem, the development of renewable green new energy is imminent. As an environmentally friendly energy utilization technology, fuel cells can directly con...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/921H01M4/926Y02E60/50
Inventor 王伟荆王莉牛晓博王亚晖刘世葭
Owner LANZHOU JIAOTONG UNIV
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