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Anti-poisoning Pt-based nano-catalyst, and preparation method and application thereof

A catalyst, electrocatalyst technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as affecting catalyst ability, reducing active sites, reducing battery performance, etc., to achieve high catalytic performance and anti-poisoning properties, reducing CO poisoning problems, preventing agglomeration and loss

Active Publication Date: 2018-02-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In summary, there are the following problems in the prior art: (1) The poisoning problem of Pt-based catalysts can be weakened to a certain extent by adding a second metal component or metal oxide / carbide component, but it is resistant to The poisoning ability needs to be further improved; (2) After Pt forms a surface composite structure with other metals, metal oxides, or metal carbides, the active sites of Pt on the catalyst surface are reduced, which affects the activation of the catalyst. 2 ability, thus reducing the performance of the battery; (3) the content of the added second metal, metal oxide, metal carbide, or metal nitride component needs to be well regulated, and many times these components are in acidic medium (4) The preparation process of these catalysts is often too complicated to be suitable for large-scale application

Method used

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  • Anti-poisoning Pt-based nano-catalyst, and preparation method and application thereof
  • Anti-poisoning Pt-based nano-catalyst, and preparation method and application thereof
  • Anti-poisoning Pt-based nano-catalyst, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Dissolve 0.3827g ammonia borane with 10ml of anhydrous diglyme, under Ar protection condition, ammonia borane solution is added to the there-necked flask that 0.3013g 37wt.%Pt / C catalyst (TKK) is housed, wherein B / The atomic ratio of Pt was 20:1, reacted at 140°C for 3h, then centrifuged to remove the supernatant, dried at 60°C for 72h, and placed the sample in NH 3 Nitriding treatment at 500 or 700 degrees in the atmosphere for 2 hours to obtain Pt 1 @(BN) 20 / C core-shell structure nanocatalytic materials.

[0044] High-resolution electron microscopy (see figure 1 ) shows that the surface of Pt nanoparticles supported by carbon black is coated with boron nitride to form a core-shell structure.

Embodiment 2

[0046] Dissolve 0.0185g ammonia borane with 5ml of anhydrous diglyme, under Ar protection condition, ammonia borane solution is added to the there-necked flask that 0.1004g 37wt.%Pt / C catalyst (TKK) is housed, wherein B / The atomic ratio of Pt is 3:1, react at 140°C for 3h, then centrifuge to remove the supernatant, dry at 60°C for 48h, put the sample in NH 3 Nitriding treatment at 500 or 700 degrees in the atmosphere for 2 hours to obtain Pt 1 @(h-BN) 3 / C core-shell structure nanocatalytic materials.

Embodiment 3

[0048] Dissolve 0.2534g ammonia borane with 20ml of anhydrous diglyme, under Ar protection condition, ammonia borane solution is added to the there-necked flask that 0.1017g 37wt.%Pt / C catalyst (TKK) is housed, wherein B / The atomic ratio of Pt was 40:1, reacted at 140°C for 3h, then centrifuged to remove the supernatant, dried at 60°C for 70h, and placed the sample in NH 3 Nitriding treatment at 500 or 700 degrees in the atmosphere for 2 hours to obtain Pt 1 @(h-BN) 40 / C core-shell structure nanocatalytic materials.

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Abstract

The invention discloses an anti-poisoning Pt-based nano-catalyst, and a preparation method and application thereof. An ultrathin h-BN shell structure is formed on the surface of a carbon-supported Ptand Pt-based alloy nano-catalyst by utilizing a surface coating method to obtain a core-shell nano-structure of Pt@h-BN / C and PtTM@h-BN / C(TM is a transition metal, such as Ru, Sn, Au and Fe). The catalyst serves as an H2-O2 proton exchange membrane fuel cell anode catalyst which can remarkably inhibit the CO poisoning effect on a Pt-based catalyst; the catalyst can also be used in a direct methanol fuel cell and can show resistance to methanol poisoning.

Description

technical field [0001] The invention relates to proton exchange membrane fuel cell technology, in particular to a Pt-based nanometer catalyst used for proton exchange membrane fuel cell anti-CO poisoning and anti-methanol poisoning and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC), as an efficient and clean electrochemical power generation device that directly converts chemical energy into electrical energy, has broad application prospects in electric vehicles, distributed power sources for household combined heat and power systems, and so on. [0003] The widely used Pt / C catalysts in PEMFCs have quite high catalytic activity and have attracted much attention in both academic fields and industrial applications. However, the application of Pt-based catalysts in proton exchange membrane fuel cells mainly has the following challenges. First, due to the limited reserves of precious metals in the earth's crust and their h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M8/1009B82Y30/00
CPCB82Y30/00H01M4/921H01M4/923H01M4/926H01M8/1009Y02E60/50
Inventor 傅强孙梦梦汪国雄
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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