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A preparation method of a platinum-cobalt-iridium alloy structure catalyst supported on a nitrided three-dimensional carrier for a low-temperature fuel cell

A technology for structural catalysts and fuel cells, which is applied in structural parts, battery electrodes, circuits, etc., and can solve problems such as influence, catalyst activity decline, and unexamined effects.

Active Publication Date: 2021-05-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the acidic and high-potential harsh working environment of the fuel cell, it is still difficult to avoid the loss of cobalt in the platinum-cobalt alloy catalyst during long-term use, resulting in a decrease in catalyst activity and damage to membranes and other accessories in the fuel cell. certain influence
[0004] Chinese patent CN 201480002413.1 discloses a method of introducing tantalum into tin oxide used as a fuel cell catalyst carrier to improve electrical conductivity and improve the dispersion of metal nanoparticle active components on the carrier, but does not examine its use as a carrier additive. Effect
The patent states that 0.5M H of TaC at 95°C 2 SO 4 The stability in aqueous solution is significantly better than WC, TiN, TiC, ZrC, but TaC is not introduced into the carrier

Method used

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  • A preparation method of a platinum-cobalt-iridium alloy structure catalyst supported on a nitrided three-dimensional carrier for a low-temperature fuel cell

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Experimental program
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Embodiment 1

[0032] 1. Oxidation pretreatment of carbon nanotubes (CNTs): Mix 200mg of carbon nanotubes with 200mL of concentrated sulfuric acid / concentrated nitric acid (volume ratio 3:1) solution, and after ultrasonic dispersion, stir in an oil bath at 80°C for 5 After the reaction is completed, cool to room temperature, centrifuge, wash, and vacuum-dry to obtain oxygen-containing carbon nanotubes.

[0033] 2. Graphene oxide reduction and its nitriding and three-dimensional assembly with oxygen-containing carbon nanotubes: Take 100mg oxygen-containing carbon nanotubes, 50mL 2mg / mL graphene oxide aqueous solution, 50mL deionized water and 700mg C 6 h 12 N 4 Mix and stir at room temperature for 1 hour; transfer the above mixed solution to a hydrothermal kettle, seal it, and react at 180°C for 20 hours; cool the above solution to room temperature, centrifuge, wash, and redisperse in 50 mL of deionized water, An aqueous solution of a three-dimensional assembly carrier of nitrogen-modified ...

Embodiment 2

[0039] The difference between this embodiment and embodiment one is that the mass ratio of controlling oxygen-containing carbon nanotubes to graphene oxide is 200mg:100mg, while controlling K 2 PtCl 4 、H 2 IrCl 6 with CoCl 2 2H 2 The mass ratio of O is 100mg:16mg:20mg, and the obtained catalyst is denoted as Pt 1 co 0.3 Ir 0.2 / NT 200 -rGO 100 -N-TaC.

Embodiment 3

[0041] The present embodiment is different from Embodiment 1 in that the mass ratio of controlling oxygen-containing carbon nanotubes to graphene oxide is 800mg:200mg, while controlling H 2 PtCl 6 、H 2 IrCl 6 and Co(NO 3 ) 2 6H 2 The mass ratio of O is 100mg:25mg:36mg, and the catalyst obtained is denoted as Pt 1 co 0.3 Ir 0.3 / NT 800 -rGO 200 -N-TaC.

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Abstract

The invention relates to a method for preparing a platinum-cobalt-iridium alloy structure catalyst loaded on a nitrided three-dimensional carrier for a low-temperature fuel cell. Specifically, the carbon nanotubes are oxidized and pretreated first, then graphene oxide is reduced and its nitriding and three-dimensional assembly with oxygen-containing carbon nanotubes are carried out, and then the two-dimensional TaC nanosheets are formed on the three-dimensional assembly carrier. In-situ synthesis, and then complete the loading of metal nanoparticles, then remove the unstable cobalt element in the PtCoIr alloy nanoparticles, and finally heat treatment promotes the full alloying of the PtCoIr alloy nanoparticles. The test found that its oxygen reduction catalytic activity and stability are good. The electrocatalyst obtained by the preparation method has great application prospects in low-temperature proton exchange membrane fuel cells.

Description

technical field [0001] The invention relates to a method for preparing a platinum-cobalt-iridium alloy structure catalyst loaded on a nitrided three-dimensional carrier for a low-temperature fuel cell. Background technique [0002] A low-temperature proton exchange membrane fuel cell (PEMFC) is a power generation device that converts chemical energy stored in a fuel cell into electrical energy. Due to its high energy conversion efficiency and environmental friendliness, low-temperature fuel cells are considered to be a technology that may replace internal combustion engines and have broad application prospects in the automotive field. However, the commercialization of fuel cells also faces many important challenges, one of which is the high cost of Pt as its cathode oxygen reduction (ORR) catalyst. As the most widely used low-temperature fuel cell ORR catalyst, Pt-based catalysts have an exchange current density of only 10 -10 A cm -2 . Low ORR activity implies the need ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92H01M4/88
CPCY02E60/50
Inventor 邵志刚曹龙生方达晖唐雪君秦晓平衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI