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Passivated metallic bipolar plates and a method for producing the same

A bipolar plate, passivation layer technology, applied in battery electrodes, electrochemical generators, fuel cells, etc., can solve problems such as increasing the internal resistance of fuel cells and reducing electrical performance

Inactive Publication Date: 2012-05-30
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this oxide layer is non-conductive and thus increases the internal resistance of the fuel cell, reducing its electrical performance

Method used

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  • Passivated metallic bipolar plates and a method for producing the same
  • Passivated metallic bipolar plates and a method for producing the same
  • Passivated metallic bipolar plates and a method for producing the same

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Embodiment Construction

[0013] The description of the following embodiments is merely exemplary in nature and is not intended to limit the invention and its applications in any way.

[0014] see figure 1 , in one embodiment a fuel cell substrate 10 is provided. The substrate may include at least one of stainless steel, titanium, aluminum, or a nickel-based alloy. The substrate 10 may be processed to form a passivation layer 12 . The treatment of the substrate 10 may include at least one of the following: contacting the substrate with nitric acid solution, performing heat treatment on the substrate above 400° C., or immersing the substrate in boiling deionized water. In one embodiment, heat treating the substrate may comprise placing the substrate in a furnace set at a temperature above 400°C, such as 450°C. In one embodiment, the treatment of the substrate 10 removes any residual iron resulting from mechanical treatment of the substrate, such as when the substrate is stainless steel. Passivation ...

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Abstract

A method including providing a substrate; treating the substrate to form a passive layer, wherein the passive layer has a thickness of at least 3 nm; and depositing an electrically conductive coating over the substrate, wherein the coating has a thickness of about 0.1 nm to about 50 nm.

Description

technical field [0001] The field to which the present invention is primarily concerned includes fuel cells, fuel cell assemblies, and methods of making and using the same. Background technique [0002] A fuel cell is an electrochemical device that includes an anode, a cathode, and an electrolyte sandwiched between them. The anode receives hydrogen-rich gas or pure hydrogen, and the cathode receives oxygen or air. Hydrogen is dissociated at the anode to produce free protons and electrons. The protons travel through the electrolyte to the cathode. The protons react with oxygen and electrons at the cathode to produce water. Electrons from the anode cannot pass through the electrolyte and are therefore directed through a load to perform work before being sent to the cathode. The work can be used, for example, to run a car. [0003] Proton exchange membrane (PEM) fuel cells are widely used in automobiles. PEM fuel cells typically include a solid polymer electrolyte proton c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M8/02H01M4/86
CPCH01M2008/1095H01M8/0208Y02E60/50H01M8/021H01M8/0245H01M8/0228
Inventor M·H·阿布德埃尔哈米德G·V·达赫奇Y·M·米克黑尔
Owner GM GLOBAL TECH OPERATIONS LLC