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Ordered catalyst layer and preparation and application thereof

A catalytic layer, catalyst technology, applied in nanotechnology, electrical components, battery electrodes, etc. for materials and surface science, to achieve the effect of improving utilization, reducing usage, and shortening conduction paths

Active Publication Date: 2017-02-15
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

PPy carriers with good conductivity and high stability in different shapes are involved in different fields, but the ordered PPy nanowire arrays grow on the surface of stainless steel as ordered catalyst carriers, through the H 2 The ethanol solution of the precursor salt of Pt is reduced to obtain the Pt catalyst and then transferred to the Nafion membrane to obtain the PtM-PPy electrode. The proton conductor Nafion is not used in the catalytic layer, and it has not been used in proton exchange membrane fuel cells.

Method used

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  • Ordered catalyst layer and preparation and application thereof
  • Ordered catalyst layer and preparation and application thereof
  • Ordered catalyst layer and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: FeCo alloy catalyst loaded on stainless steel surface by magnetron sputtering (co-sputtering FeCo catalyst, deposition conditions: under Ar atmosphere at 20°C, sputtering power 200W, vacuum degree 1.0Pa, sputtering time 6min, Fe : Co (atomic ratio) = 1:1, catalyst thickness: ~ 20nm), and then prepare a carbon layer on the stainless steel surface by CVD (CH 4is the carbon source, the volume ratio of CH 4 :H 2 =1:4, flow rate 50mL min -1 , temperature: 700°C, radio frequency: 200W, reaction time: 25min). Then in situ polymerize the ordered PPy array on the surface of the carbon layer by potentiostatic polymerization (deposition potential 0.7V, temperature: 25°C, reaction time: 20min, reaction solution: 0.2M phosphate buffer + 0.1M p-toluenesulfonate Sodium acid + 0.1M pyrrole monomer), the PPy array has the characteristics of growing perpendicular to the surface of the carbon layer and has a length of 1.2 μm and a diameter of 80 nm.

[0025] Step 2: Deposit Ag...

Embodiment 2

[0028] Take the PPy nanorod array prepared in step 1 of Example 1, and first pass magnetron sputtering Pd catalyst (under Ar atmosphere at 20°C, sputtering power 200W, vacuum degree 1.0Pa, sputtering time Pd: 8min) , and then put the sample in H 2 Saturated 100mL with K 2 PtCl 4 (20mg) ethanol solution, after reduction reaction for 1.5h, the PPy array with the catalyst was transferred onto the Nafion membrane, and used as a single-cell cathode, wherein the cathode catalyst loading (Pt: 0.101mg / cm 2 ,Pd:50μg / cm 2 );

[0029] The anode is commercialized GDE (0.4mg Pt / cm 2 ), used in proton exchange membrane fuel cells. Battery temperature: 65°C, PH 2 =PO 2 =0.05MPa, gas flow: H 2 =50 sccm,O 2 =100sccm, Humidity: H 2 / O 2 =100% / 100%, Nafion membrane.

[0030] image 3 is the i_V curve of the single-cell test when the PtPd-PPy ordered electrode is used as the cathode. The single-cell performance of the electrode prepared here is better than that of the previously pr...

Embodiment 3

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

[0035] Magnetron sputtering Cu metal particles on the PPy nanowire array (Cu: 5min, other sputtering conditions are the same as in Example 1, Cu: 25.245 μg / cm 2 ), by K with 0.1M 2 PtCl 4 The solution was subjected to a displacement reaction to obtain a PtCu-PPy array (Pt: 60.5 μg / cm 2 ).

[0036] The prepared electrode is carried out half-cell test, and the test condition is (N 2 saturated 0.5M H 2 SO 4 , scanning speed 50mV / s, scanning range: -0.241V-0.959V vs SCE)

[0037] Figure 4 It is the CV diagram of PtCu-PPy.

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Abstract

The invention relates to an ordered catalyst layer of a proton exchange membrane fuel cell. Fe, Co, Ni or alloy thereof is loaded on the surface of stainless steel, and then a carbon layer is prepared on the surface of the stainless steel through a CVD method. Then, an ordered PPy array is formed on the surface of the carbon layer through in-situ polymerization by an electrochemical polymerization method, so that the PPy array has the characteristic that the PPy array grows approximately perpendicular to the surface of the carbon layer. One or two kinds of metal are firstly loaded on the array, and then the PPy array coated with a catalyst is transfer-printed on a Nafion film, so that an ordered thin catalyst layer is constructed. The catalyst layer prepared with the method does not contain a proton conductor (such as Nafion), and the constructed ordered catalyst layer can be used for proton exchange membrane fuel cells, alkaline fuel cells and solid polymer water electrolysis pools.

Description

technical field [0001] The invention belongs to the field of fuel cells and other electrochemical devices, and mainly relates to a preparation method of an ordered catalytic layer of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cells (PEMFC) have attracted much attention due to their advantages of high energy conversion efficiency, high power density, environmental friendliness, and fast start-up at room temperature. . The stability problem is mainly that the carbon support in the Pt / C catalyst is prone to corrosion and the proton conductor Nafion used in the catalytic layer is degraded. In order to solve these problems, 3M proposed ordered thin layer electrodes (NSTFs) without proton conductors on both sides of the catalytic layer. The three-dimensional ordered electrode structure makes the mass transfer of the reactants and products of the electrode significantly better than the traditional catalytic layer. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/8814H01M4/926Y02E60/50
Inventor 俞红梅蒋尚峰邵志刚衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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