Preparation method of York-shell nitrogen-doped carbon nanocage-coated platinum nanoparticles oxygen-reduction electrocatalyst with high methanol tolerance

A nitrogen-doped carbon and nano-cage technology, applied in circuits, electrical components, battery electrodes, etc., can solve problems such as complex processes, increased costs, and environmental pollution, and achieve simple technical routes, strong alcohol resistance, and environmental friendliness Effect

Inactive Publication Date: 2016-05-25
NANJING UNIVERSTIY SUZHOU HIGH TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the inert surface of carbon nanotubes, chemical modification is required in advance, which complicates the process and increases the cost, which brings environmental pollution.

Method used

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  • Preparation method of York-shell nitrogen-doped carbon nanocage-coated platinum nanoparticles oxygen-reduction electrocatalyst with high methanol tolerance
  • Preparation method of York-shell nitrogen-doped carbon nanocage-coated platinum nanoparticles oxygen-reduction electrocatalyst with high methanol tolerance
  • Preparation method of York-shell nitrogen-doped carbon nanocage-coated platinum nanoparticles oxygen-reduction electrocatalyst with high methanol tolerance

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Experimental program
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Embodiment 1

[0035] Embodiment 1 illustrates the concrete operation method of the present invention

[0036] (1) Weigh 50mg of NCNCs and place it in a vacuum device to evacuate to about 30Pa, add 25ml of 0.01g / ml chloroplatinic acid (it can be one or more mixtures of chloroplatinic acid, sodium chloroplatinate, and platinum acetate) ) in the aqueous solution was stirred for ten minutes, so that the chloroplatinic acid solution was sucked into the cage. Then filter, freeze-dry, then wash off the chloroplatinic acid on the surface with water, then dry, and finally reduce the washed and dried product for 2 hours at 300°C (generally 300-800°C) in a hydrogen atmosphere, and analyze and detect. The particle size of Pt metal nanoparticles in the thus prepared PtNCNCs catalyst is about 1-5nm, and the Pt content is 2.50w.t.%.

[0037](2) Weigh 50mg of NCNCs and place it in a vacuum device to evacuate to about 30Pa, add 25ml of 0.02g / ml chloroplatinic acid (it can be one or more mixtures of chlorop...

Embodiment 2

[0051] Embodiment 2 illustrates the performance of the catalyst prepared by the present invention

[0052] (1) In 0.5M sulfuric acid electrolyte, CV and RDE experiments of PtNCNCs, Pt / NCNCs and commercial Pt / C were carried out. The experimental results showed that compared with the catalyst loaded on the surface with the same Pt ​​loading, the PtNCNCs prepared by this patent The catalyst is later in the peak potential, and the limiting potential current is slightly lower, showing the difference between Pt on the outer surface and inner surface of the carbon support. see attached image 3 .

[0053] (2) The stability test of Pt / NCNCs and PtNCNCs in 0.5M sulfuric acid was carried out for 80,000 seconds. The comparison charts of CV and RDE before and after show that the catalyst prepared by this patent has excellent stability.

[0054] (3) Add 5% methanol to 0.5M sulfuric acid electrolyte, conduct CV and RDE experiments, and compare with CV and RDE without adding methanol. Exp...

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Abstract

The invention discloses nitrogen-doped carbon nanocage-coated platinum nanoparticles (Pt@NCNCs) as a methanol-tolerant oxygen-reduction electrocatalyst. With the NCNCs, which are uniform in nitrogen distribution, high in purity and high in quality and have independent intellectual property, prepared by a chemical vapor deposition method as a carrier, anchoring and coordination effects of nitrogen can be directly utilized without surface pretreatment on the carrier; and the Pt nanoparticles are extremely evenly coated with an NCNCs cage to form a York-shell catalytic material. The oxygen-reduction electrocatalyst is simple in preparation process and friendly to environment. The oxygen-reduction catalytic activity is equivalent to the best result reported by the existing literature. Remarkably, the catalyst has complete methanol tolerance while a commercial Pt/C catalyst and an NCNCs-loaded Pt metal nanoparticles catalyst are extremely poor in methanol tolerance. The stability performance is good and far better than that of the Pt/C catalyst and the Pt/NCNCs catalyst.

Description

technical field [0001] This patent relates to a method of using nitrogen-doped carbon nanocages (NCNCs) as a carrier to realize the first time that platinum is wrapped in nitrogen-doped carbon cages to construct oxygen reduction catalysts for platinum-based fuel cells. While ensuring high oxygen reduction catalytic activity and excellent stability, this catalyst has superior alcohol resistance performance, which is far superior to the commercial Pt / C and Pt / NCNCs control catalysts. Background technique [0002] Fuel cell is the fourth generation power generation technology following thermal power, hydropower and nuclear power. It is an electrochemical power generation device that converts chemical energy stored in oxidant and fuel directly into electrical energy through an electrochemical reaction process. It has high energy efficiency and low pollutant emissions, and is recognized as an advanced, efficient and environmentally friendly energy technology. [0003] Direct Alc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/8803H01M4/921Y02E60/50
Inventor 沈丽明卓欧王喜章吴强杨立军胡征
Owner NANJING UNIVERSTIY SUZHOU HIGH TECH INST
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