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Metal double polar plates of polymer electrolyte film fuel cell and method of manufacturing the same

A metal bipolar plate and electrolyte membrane technology, which is applied to fuel cell parts, battery electrodes, circuits, etc., can solve the problem of reduced service life of polymer electrolyte membrane fuel cells, unsuitable for production of low-cost, precious metal coating costs Advanced problems, to achieve the effect of large-scale industrial production and large-scale market application, low cost and low processing cost

Inactive Publication Date: 2009-02-18
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Precious metal coatings are unsuitable for low-cost battery packs due to their high cost
Using PVD [5-10] , CVD [11-13] and plating [14，15] Nitride and oxide coatings prepared by different methods will generate unavoidable defects such as micropores and microcracks due to the limitation of the preparation process, which will peel off due to local corrosion, which will cause the service life of the polymer electrolyte membrane fuel cell. reduce
So far, there is no large-scale market application of metal bipolar plates with surface treatment.

Method used

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  • Metal double polar plates of polymer electrolyte film fuel cell and method of manufacturing the same

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Experimental program
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Effect test

Embodiment 1

[0028] The austenitic stainless steel 316L plate is nitrided by plasma nitriding technology, the nitriding temperature is 380°C, the nitriding time is 1h, the glow voltage is 500V during the heat preservation stage, the vacuum degree in the furnace is 200Pa, and the reaction gas is ammonia gas . The resulting surface modification layer had a thickness of 2 μm. The anodic polarization curve and the potentiostatic polarization under the working condition of polymer electrolyte membrane fuel cell are both in 1M H 2 SO 4 +2ppmF - +1M CH 3 OH and 1M H 2 SO 4 +2ppm F - +0.01M CH 3 in a solution of OH. After plasma nitriding treatment, the interface contact resistance is significantly lower than that of graphite. Such as figure 1 shown. Passivation current density is less than 10μA / cm 2 .

Embodiment 2

[0030] The austenitic stainless steel 310 plate is nitrided by plasma nitriding technology, the nitriding temperature is 400°C, the nitriding time is 30h, the glow voltage is 500V during the heat preservation stage, the vacuum degree in the furnace is 1000Pa, and the reaction gas is pure nitrogen. . The thickness of the resulting infiltrated layer was 15 μm. The anodic polarization curve and the potentiostatic polarization under the working conditions of the polymer electrolyte membrane fuel cell are both at 1M H 2 SO 4 +2ppm F - in the solution. In order to simulate the working environment of polymer electrolyte membrane fuel cells, H2 was passed through the solution during all electrochemical experiments 2 or air. After the plasma nitride layer treatment, the interfacial contact resistance is significantly lower than that of graphite. Passivation current density is less than 10μA / cm 2 .

Embodiment 3

[0032] The austenitic stainless steel 316L plate is nitrided by plasma nitriding technology, the nitriding temperature is 440°C, the nitriding time is 15h, the glow voltage is 500V in the holding stage, the vacuum degree in the furnace is 1000Pa, and the reaction gas is pure nitrogen. . The thickness of the resulting infiltrated layer was 30 μm. The anodic polarization curve and the potentiostatic polarization under the working conditions of the polymer electrolyte membrane fuel cell are both at 1M H 2 SO 4 +2ppm F - +0.01M CH 3 OH and 1M H in air 2 SO 4 +2ppm F - +1M CH 3 in a solution of OH. After the plasma nitride layer treatment, the interfacial contact resistance is significantly lower than that of graphite. Passivation current density is less than 10μA / cm 2 .

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Abstract

A polymer electrolyte film fuel battery metal bipolar plate and preparation method thereof, nitridizing process in nitriding furnace: nitridizing temperature 380 deg C to 450 deg C, nitridizing time 0.5h to 10.0h, glow voltage in holding stage 500V to 700V, current density 0.5mA / sq.cm to 15mA / sq.cm, vacuum in the furnace 133Pa to 1330Pa, reaction gas being nitrogen or ammonia. The invention uses high conductive and corrosion resisting permeability barrier with low cost to replace metal coating, generate thin metal bipolar plate to improve equality rate power and volume rata power of the battery group. Contact resistance of the invention processed by plasma nitride layer is reduced obviously, which is less than that of graphite. Passivation current density is less than 10 microA / sq.cm.

Description

technical field [0001] The invention belongs to the technical field of fuel cell electrodes. In particular, it relates to a polymer electrolyte membrane fuel cell of a bipolar plate of a polymer electrolyte membrane fuel cell. Background technique [0002] In addition to the characteristics of high energy conversion efficiency, long life, and environmental friendliness, polymer electrolyte fuel cells have become a power source for transportation and construction of decentralized power stations due to their low operating temperature and fast start-up. power supply. However, factors such as high cost, weight, and volume largely hinder the large-scale commercial application of polymer electrolyte fuel cells. Therefore, cost reduction has become the focus of governments and researchers. [0003] As one of the important multifunctional components in polymer electrolyte fuel cells, the bipolar plate not only has the functions of separating the reactant gas, collecting electrici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/0206
CPCY02E60/50Y02P70/50
Inventor 田如锦
Owner DALIAN JIAOTONG UNIVERSITY
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