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ruo 2 Modified fuel cell bipolar plate and preparation method thereof

A fuel cell, bipolar plate technology, applied in solid electrolyte fuel cells, battery electrodes, circuits, etc., can solve the problems of high cost battery packs, shortened service life of polymer electrolyte membrane fuel cells, etc., and achieves simple preparation method, processing Low cost and improved corrosion resistance

Active Publication Date: 2017-07-11
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, noble metal modified layers are not suitable for producing low-cost battery packs due to their high cost
Nitride and oxide coatings prepared by different methods such as PVD, CVD, electroless plating and electroplating will generate unavoidable defects such as micropores and microcracks due to the limitation of the preparation process, which will cause localized corrosion and peeling off of the coating. and polymer electrolyte membrane fuel cells significantly shorten the service life of
Because these methods always have one or another deficiency, so far, there is no large-scale market application of metal bipolar plates processed by surface modification.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The RuO provided by this embodiment 2 Modified fuel cell bipolar plate, with 316L as the bipolar plate substrate, and the surface of the bipolar plate substrate is RuO 2 Modified layer; specifically prepared according to the following method:

[0018] (1) After cleaning 316L stainless steel with cleaning agent, rinse thoroughly with double distilled water and dry;

[0019] (2) 316L stainless steel is boiled in 0.01M dilute chromic acid and cleaned with ultrasonic waves for 15 minutes;

[0020] (3) 316L stainless steel immersed in RuCl with a concentration of 0.005M 3 solution and NH at a concentration of 0.05M 4 In the mixed solution with a pH value of 2.0 obtained by mixing the Cl solution, when the temperature reaches 55°C, a RuO layer with a thickness of 1 μm is formed on the surface of the substrate after reacting for 0.5 h. 2 modified layer.

[0021] RuO prepared in this example 2 The resistivity of the modified 316L stainless steel bipolar plate is 0.002mΩ c...

Embodiment 2

[0023] The RuO provided by this embodiment 2 Modified fuel cell bipolar plate, with carbon steel as the bipolar plate substrate, and the surface of the bipolar plate substrate is RuO 2 Modified layer; specifically prepared according to the following method:

[0024] (1) After the carbon steel is cleaned with a cleaning agent, it is thoroughly rinsed with twice distilled water and dried;

[0025] (2) Carbon steel is boiled in 0.02M dilute chromic acid, and cleaned by ultrasonic waves for 15 minutes;

[0026] (3) Carbon steel is immersed in RuCl with a concentration of 0.1M 3 solution and a concentration of 0.2M NH 4 In the mixed solution with a pH value of 2.0 obtained by mixing the Cl solution, when the temperature reaches 60°C, a RuO layer with a thickness of 10 μm is formed on the surface of the substrate after 1 hour of reaction. 2 modified layer;

[0027] RuO prepared in this example 2 The modified carbon steel bipolar plate has a resistivity of 0.005 mΩ cm and a gas...

Embodiment 3

[0029] The RuO provided by this embodiment 2 Modified fuel cell bipolar plate, with pure titanium plate as the bipolar plate substrate, and the surface of the bipolar plate substrate is RuO 2 Modified layer; specifically prepared according to the following method:

[0030] (1) After the pure titanium plate is cleaned with a cleaning agent, it is thoroughly rinsed with twice distilled water and dried;

[0031] (2) The pure titanium plate is boiled in 0.05M dilute chromic acid, and cleaned by ultrasonic wave for 15 minutes;

[0032] (3) The pure titanium plate is immersed in RuCl with a concentration of 0.1M 3 solution and a concentration of 0.5M NH 4 In the mixed solution with a pH value of 2.0 obtained by mixing the Cl solution, when the temperature reaches 65°C, a RuO layer with a thickness of 50 μm is formed on the surface of the substrate after 2.5 hours of reaction. 2 modified layer;

[0033] RuO prepared in this example 2 The resistivity of the modified pure titaniu...

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PUM

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Abstract

The invention discloses a metal bipolar plate of a fuel cell with a polymer electrolyte membrane. A RuO2-modified layer with the thickness of 1-50mu m is arranged on the surface of a matrix, the corrosion rate is lower than 10mu A / cm<2>, the resistivity is lower than 0.01mohm.cm, and the gas permeability is lower than 1*10<-4>cm<3> / s.cm<2>. The RuO2-modified layer provided by the metal bipolar plate can be used for simultaneously and remarkably improving the corrosion resistance, surface conductivity and battery performance of the metal bipolar plate under the condition that the strength of the bipolar plate is not influenced. A preparation method has the advantages of simple process, low cost, large-scale batch production and the like.

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, and environmental friendliness. In addition, they have low operating temperature and can achieve low-temperature rapid start-up. They are especially suitable as a power source for transportation and for building decentralized power stations. removable power supply. However, many factors such as relatively high cost, weight, and volume are largely unfavorable for the large-scale commercial application of polymer electrolyte membrane fuel cells. Therefore, how to reduce the cost of its raw materials and preparation has always been a hot issue of concern to governments and researchers. [0003] As an important multifunctional com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/86H01M4/8647H01M4/88H01M8/10Y02E60/50
Inventor 田如锦
Owner DALIAN JIAOTONG UNIVERSITY