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ITO/Nb composite modified polymer electrolyte membrane fuel cell metal bipolar plate and preparation method therefor

A metal bipolar plate, composite modification technology, applied in fuel cells, fuel cell parts, circuits, etc., can solve the problem of shortening the service life of polymer electrolyte membrane fuel cells, corrosion of metal bipolar plates, and expensive battery packs and other problems, to achieve the effect of easy mass production, uniform and dense surface, improved corrosion resistance and surface conductivity

Inactive Publication Date: 2017-07-04
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, expensive noble metal modification layers are not suitable for producing low-cost battery packs
Limited by the preparation process conditions, the nitride and oxide modified layers prepared by different methods such as PVD, CVD, chemical plating and electroplating often have unavoidable structural defects such as micropores and microcracks.
These defects will undoubtedly cause localized corrosion of the metal bipolar plate and lead to peeling off of the modified layer, thereby significantly shortening the service life of the polymer electrolyte membrane fuel cell.
Based on the existing surface modification methods, there are always more or less sufficient limitations, and there is no metal bipolar plate treated by surface modification that can meet the requirements of the current large-scale market application of polymer electrolyte membrane fuel cells.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] For the ITO / Nb composite modified polymer electrolyte membrane fuel cell metal bipolar plate provided in this example, the ITO / Nb composite modified layer was prepared on the AISI 316L stainless steel substrate by magnetron sputtering according to the following steps:

[0017] 1) Pretreatment: AISI 316L stainless steel substrate after 400 ~ 2500 # Grinding with sandpaper followed by polishing with diamond abrasive paste. In order to remove the surface grease, use acetone and alcohol solution for ultrasonic cleaning for 15 minutes;

[0018] 2) The pretreated AISI 316L stainless steel substrate is placed in the sample chamber, preheated to 250 ° C; 2 The mixed gas, ion bombardment on the surface of AISI 316L stainless steel substrate to clean the surface and remove surface oxide, the time is 15min;

[0019] 3) Process parameters for preparing the Nb transition layer: the pulse frequency is 120kHz, the substrate bias is -50V, the Ar gas partial pressure is 0.7Pa, the pow...

Embodiment 2

[0023] For the ITO / Nb composite modified polymer electrolyte membrane fuel cell metal bipolar plate provided in this example, the ITO / Nb composite modified layer was prepared on the AISI 446 stainless steel substrate by magnetron sputtering according to the following steps:

[0024] 1) Pretreatment: AISI 446 stainless steel substrate after 400 ~ 2500 # Grinding with sandpaper followed by polishing with diamond abrasive paste. In order to remove the surface grease, use acetone and alcohol solution for ultrasonic cleaning for 15 minutes;

[0025] 2) The pretreated AISI 446 stainless steel substrate is put into the sample chamber and preheated to 250°C. into Ar and H 2 The mixed gas, ion bombardment on the surface of AISI 446 stainless steel substrate to clean the surface and remove surface oxide, the time is 15min;

[0026] 3) Process parameters for preparing the Nb transition layer: the pulse frequency is 120kHz, the substrate bias is -50V, the Ar gas partial pressure is 0.7...

Embodiment 3

[0030] The ITO / Nb composite modified polymer electrolyte membrane fuel cell metal bipolar plate provided by this embodiment is prepared by magnetron sputtering on an industrially pure titanium (TA2) substrate according to the following steps:

[0031] 1) Pretreatment: industrial pure titanium (TA2) substrate after 400 ~ 2500 # Grinding with sandpaper followed by polishing with diamond abrasive paste. In order to remove the surface grease, use acetone and alcohol solution for ultrasonic cleaning for 15 minutes;

[0032]2) The pretreated industrial pure titanium (TA2) substrate is put into the sample chamber and preheated to 250°C. into Ar and H 2 The mixed gas is used to bombard the surface of the industrially pure titanium (TA2) substrate to clean the surface and remove surface oxides, and the time is 15 minutes;

[0033] 3) Process parameters for preparing the Nb transition layer: the pulse frequency is 120kHz, the substrate bias is -50V, the Ar gas partial pressure is 0.7...

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PUM

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Abstract

The invention provides an ITO / Nb composite modified polymer electrolyte membrane fuel cell metal bipolar plate. A 2-6[mu]m ITO / Nb composite modification layer is on the surface of the metal bipolar plate, wherein the corrosion speed is lower than 10[mu]A / cm<2>, and contact resistance is lower than 10m<omega>.cm<2>. Under the premise of ensuring sufficient strength, a magnetron sputtering method is adopted by the preparation method disclosed by the invention, so that the corrosion resistance and surface electrical conductivity of the metal bipolar plate can be improved synchronously, and the performance of the polymer electrolyte membrane fuel cell is improved; and the preparation method has the advantages of mature process, continuous production, and excellent surface quality of the modification layer, so that large-scale batch production of the bipolar plate can be realized.

Description

technical field [0001] The invention belongs to the technical field of fuel cells. In particular, it relates to metal bipolar plates of polymer electrolyte membrane fuel cells and their surface modification. Background technique [0002] Polymer electrolyte membrane fuel cells have the characteristics of high energy conversion efficiency, long life, low operating temperature, environmental friendliness, and low-temperature rapid start-up. power source. However, many factors such as relatively high cost, weight, and volume largely limit the large-scale commercial production and application of polymer electrolyte membrane fuel cells. Therefore, reducing the cost of materials and preparation of its various components has always been a hot issue that governments and researchers pay attention to and urgently need to solve. [0003] As one of the multifunctional components of the polymer electrolyte membrane fuel cell, the functions of the bipolar plate mainly include separatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0228H01M8/0206H01M8/1018
CPCH01M8/0206H01M8/0228H01M8/1018H01M2008/1095Y02E60/50Y02P70/50
Inventor 田如锦
Owner DALIAN JIAOTONG UNIVERSITY
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