Preparation method for ordered ultra-thin catalyst layer, catalyst layer and application

An ultra-thin catalytic layer and catalytic layer technology, applied in electrical components, battery electrodes, circuits, etc., to increase the three-phase reaction area, improve utilization, and reduce mass transfer resistance.

Active Publication Date: 2016-11-23
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

It can be seen that the supports of different shapes of TiN with good conductivity and high stability are involved in different fields, but the preparation and growth of ordered TiN nanorod arrays on carbon paper, as an ordered catalyst support, has not yet been used in fuel cells. used in

Method used

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  • Preparation method for ordered ultra-thin catalyst layer, catalyst layer and application
  • Preparation method for ordered ultra-thin catalyst layer, catalyst layer and application
  • Preparation method for ordered ultra-thin catalyst layer, catalyst layer and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Immerse one side of the carbon paper substrate in 0.05M-0.2M TiCl 4 Surface of aqueous solution, annealed in air at 350°C to obtain TiO 2 Seed.

[0027] Will get with TiO 2 The seeded carbon paper was immersed in a mixture of 1.1mL butyl titanate, 37mL concentrated hydrochloric acid with a mass fraction of 38%, and 37mL deionized water, and reacted at 150°C for 10h.

[0028] Will get TiO 2 Array with NH 3 For etching, NH 3 The flow rate is 60mL / cm 2 , the temperature was 850°C, and the reaction time was 4h to obtain a TiN array.

[0029] The PtPdCo alloy catalyst was loaded on the surface of the TiN array by magnetron sputtering (under Ar atmosphere at 20°C, sputtering power 200W, vacuum degree 1.0Pa, sputtering time Pt: 12min, Pd: 7min, Co: 15min) ( Atomic ratio Pt:Pd:Co=1:0.96:0.090, where Pt: 66.95μg / cm 2 ,Pd:35.115μg / cm 2,Co:1.83μg / cm 2 ), to obtain an ordered ultrathin catalytic layer.

[0030] figure 1 is a flow chart of the preparation process, figu...

Embodiment 2

[0034] Take the TiN nanorod array prepared in Example 1.

[0035] Apply electrodeposition technology (pulse electrodeposition technology is used here) to load Pt catalyst on the surface of TiN array, and the reaction solution is: 0.2mM H 2 PtCl 6 , the supporting electrolyte is 1mol HCl, 150mL. Pulse electrodeposition parameters: jp=-40mA / cm 2 , Ton=0.3ms, Toff=0.7ms, pulse time 5min.

[0036] Figure 4 is the FESEM image of the Pt-TiN nanorod array.

Embodiment 3

[0038] Get the TiN nanorod array prepared in Example 1

[0039] Magnetron sputtering (sputtering time Pt: 10min, Pd: 5min, Cu: 5min, other sputtering conditions are the same as embodiment 1) loaded PtPdCu alloy catalyst (atomic ratio Pt:Pd:Cu= 1:1.57:0.35, where Pt:45.375μg / cm 2 ;Pd: 15.775μg / cm 2 ; Cu: 5.245μg / cm 2 ), the ternary alloy is obtained by annealing treatment (the purpose of annealing treatment is to increase the degree of alloying), and an ordered ultra-thin catalytic layer is obtained.

[0040] Figure 5 It is the TEM image of PtPdCu-TiN.

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Abstract

The invention relates to a preparation method for an ordered ultra-thin electrode of a proton exchange membrane fuel cell. The preparation method comprises the steps of preparing an ordered electrode structure and establishing an ultra-thin catalyst layer; a process of impregnating and annealing is carried out on a carbon paper to obtain TiO<2> seed crystals; then a TiO<2> nanorod is grown through a hydrothermal method; a TiN ordered array is prepared through NH<3> etching; and the array is loaded with a catalyst to establish the ordered ultra-thin catalyst layer without containing a proton conductor (such as Nafion). The established ordered ultra-thin catalyst layer can be used for the proton exchange membrane fuel cell, other fuel cells and electrochemical devices.

Description

technical field [0001] The invention belongs to the field of fuel cells and other electrochemical devices, and mainly relates to a preparation method and application of an ordered ultra-thin catalytic layer of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a fuel cell that is expected to be the first to be commercialized. It has the advantages of high energy conversion efficiency, high power density, environmental friendliness, and rapid start-up at room temperature. However, cost, lifetime, and performance are the three major reasons that limit the commercialization of proton exchange membrane fuel cells. For proton exchange membrane fuel cells, most of its high cost comes from the cost of the catalyst in the membrane electrode assembly (MEA). One of the current ways to solve the problem is to start with the catalyst itself, using alloys, core-shell, or Pt monolayers to reduce the content of noble metals in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92
CPCH01M4/8867H01M4/8871H01M4/9083H01M4/926Y02E60/50
Inventor 俞红梅蒋尚峰张洪杰邵志刚衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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