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

A technology of metal bipolar plates and electrolyte membranes, applied in fuel cells, fuel cell parts, battery electrodes, etc., to achieve the effects of accelerating wide application, improving corrosion resistance, and reducing costs

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

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Problems solved by technology

Corrosion rate below 16μA / cm 2

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

[0029] The pure titanium plate is nitrided by plasma nitriding technology, the nitriding temperature is 450°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 thickness of the resulting TiN infiltrated layer is about 2 μm. The anodic polarization curve and the potentiostatic polarization under the working conditions of the polymer electrolyte membrane fuel cell are both at 0.05M 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 2or air. After treatment with plasma nitride layer, the interfacial contact resistance is significantly reduced, which is slightly higher than that of graphite. Such as figure 1 shown. Passivation current density is less than 10μA / cm 2 .

Embodiment 2

[0031] The titanium alloy (Ti-6Al-4V) plate was nitrided by plasma nitriding technology, the nitriding temperature was 600°C, the nitriding time was 6h, the glow voltage was 500V during the holding stage, and the vacuum degree in the furnace was 1000Pa. Gas is N 2 —H 2 Mixed gas, where N 2 Accounting for 80% of the reaction gas volume, H 2 20% of the reaction gas volume. The generated Ti 2 The thickness of the nitriding layer is 6 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 treatment with plasma nitride layer, the interfacial contact resistance is significantly reduced, which is slightly higher than that of graphite. Passivation current dens...

Embodiment 3

[0033] The titanium alloy (Ti-5Al-2Nb-1Ta) plate is nitrided by plasma nitriding technology, the nitriding temperature is 900°C, the nitriding time is 15h, the glow voltage is 500V during the heat preservation stage, and the vacuum degree in the furnace is 1000Pa , the reaction gas is ammonia. The generated TiN+Ti 2 The thickness of the nitriding layer is 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 treatment with plasma nitride layer, the interfacial contact resistance is significantly reduced, which is slightly higher than that of graphite. Passivation current density is less than 10μA / cm 2 .

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Abstract

A metal bipolar plate of a polymer electrolyte membrane battery and manufacturing method thereof, being manufactured via plasma nitridation process on pure titanium or titanium alloy plate with thickness of 0.1 to 3.0mm, comprising: in-furnace nitriding temperature is 400 to 500 centigrade, nitriding time is 0.5 to 30 hours, glow voltage for heat preservation is 500V to 700V, current density is 0.5 to 15mA / cm2, in-furnace vacuum temperature is 133Pa to 1330Pa, reaction gas is ammonia gas or mixed gas of nitrogen-hydrogen. The surface thickness of the product is a titanium nitride with thickness of 1 to 50mum(TiN and / or Ti2N). After plasma nitride membrane process, interface contact resistance is apparently reduced, little greater than graphite, passivation current density is less than 10muA / cm2. The surface according to the invention is thin metal bipolar plate of titanium nitride, capable of increasing mass ratio power and volume ratio power of battery banks.

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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IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/0243
CPCY02E60/50Y02P70/50
Inventor 田如锦
Owner DALIAN JIAOTONG UNIVERSITY
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