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Method for modifying proton exchange membrane fuel cell metal dual-polarity board

A technology of metal bipolar plates and proton exchange membranes, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficulties in large-scale commercial application, unacceptable processing costs, corrosion of thin-layer metal plates, etc., and achieve accelerated commercialization. process, low processing cost, and improved corrosion resistance

Active Publication Date: 2006-05-10
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In summary, due to the high brittleness of carbon plates, poor mechanical strength, and high processing costs, there are great difficulties in their large-scale commercial application.
The aluminum plate is particularly active and is easily corroded in the PEMFC environment. So far, there is no suitable modification method. The oxide film of the titanium plate itself significantly increases the internal resistance. It is usually electroplated gold and other precious metals, and the processing cost is not acceptable in mass production.
Thin-layer stainless steel plates that are easy to process and mass-produce are the most potential plate replacement materials, but thin-layer metal plates also have corrosion problems in PEMFC environments

Method used

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  • Method for modifying proton exchange membrane fuel cell metal dual-polarity board
  • Method for modifying proton exchange membrane fuel cell metal dual-polarity board
  • Method for modifying proton exchange membrane fuel cell metal dual-polarity board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 1Cr18Ni9Ti stainless steel, after conventional grinding, water washing, alcohol washing, degreasing and drying, put it into 0.01mol / L oxalic acid + 0.1mol / L aniline solution with nitrogen for 30 minutes in advance, adopt pulse mode, use stainless steel as working electrode, The carbon plate is the counter electrode, the saturated calomel electrode is the reference electrode, pulse polyaniline (the potential of the cathode pulse is -200mV, the pulse time is 10s; the anode pulse potential is between 1200mV, the pulse time is 10s, and the number of continuous pulses can be for 15 times). The cross-sectional structure of the modified plate is shown in figure 1 , the inner layer is a thin metal plate, the outer layer is a conductive polymer, and the thickness is controlled by the polymerization time, ranging from a few microns to hundreds of microns. The modified plate was simulated in the anode environment of the battery (temperature 80°C, corrosion solution 0.01mol / L...

Embodiment 2

[0031] The difference from Example 1 is:

[0032] Take a 304 stainless steel plate, after conventional grinding, washing with water, washing with alcohol, degreasing and blowing dry, put it into a solution of 3mol / L sulfuric acid and 2.0mol / L aniline with nitrogen for 30 minutes in advance, use stainless steel as the working electrode, and a carbon plate as the counter electrode. Electrode, saturated calomel electrode as reference electrode, cyclic voltammetry scanning polyaniline (scanning interval -600mV-+800mV, scanning speed 10mV / s, scanning circle number 50 circles).

[0033] Results: After polyaniline modification, the corrosion potential of 304 stainless steel in the simulated corrosion solution was also increased by nearly 600mV, the passivation current density was reduced, and the corrosion resistance was also significantly improved (see Figure 4 ).

Embodiment 3

[0035] The difference from Example 2 is:

[0036] Put it into the 0.01mol / L perchloric acid and 0.15mol / L aniline solution pre-passed with nitrogen, use stainless steel as the working electrode, a carbon plate as the counter electrode, and a saturated calomel electrode as the reference electrode, and perform cyclic voltammetry scanning polymerization. Aniline (scan range -300mV-+1200mV, scan speed 100mV / s, scan circles 5 circles).

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Abstract

This invention relates to one photon exchange film fuel battery process technique and in detail to one improvement method on the double electrode board, which Adopts three electrode system and integrates into modified electrode board by the electrochemical technique on the metal surface polymer to make the polymer single is ofaniline or thiofuran or pyrrole. The modification process comprises the following steps: putting the metal board into the liquid of oxalic acid, dipping acid or Fraude's reagent and polymer single liquid; using metal board as work electrode and carbon board as couple electrode and saturated calomel electrode as reference electrode. The invention modifies the metal board to realize the metal double board functions of anti-erosion.

Description

technical field [0001] The invention relates to the preparation technology of the bipolar plate of the proton exchange membrane fuel cell, in particular to a method for modifying the metal bipolar plate of the proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a fuel cell with perfluorosulfonic acid solid polymer as electrolyte, hydrogen or purified reformed gas as fuel, air or oxygen as oxidant, and its electrode reaction is similar to other acidic electrolyte fuel cells. Under the action of the catalyst, the reaction of hydrogen at the anode is: <chemistry num="001"> <chem file="200410082726_cml001.xml" / > < / chemistry> , the electrons generated by the electrode reaction reach the cathode through the external circuit, and the hydrogen ions reach the cathode through the electrolyte membrane. Oxygen, hydrogen ions and electrons react at the cathode to form water: 1 / 2O 2 +2H + +2e - →H 2 Most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 黄乃宝侯明刘浩明平文衣宝廉
Owner SUNRISE POWER CO LTD
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