Method of coating a separator for a fuel cell and a separator for a fuel cell

Abstract

The present invention relates to a method of coating a separator for a fuel cell and a separator for a fuel cell. A method of coating a separator for a fuel cell according to an embodiment of the present disclosure includes the steps of: vaporizing a metal nitride precursor to obtain a precursor gas; coating the metal nitride containing the precursor gas and the reactive gas A layer-forming gas is introduced into the reaction chamber; a voltage is applied to the reaction chamber so that the precursor gas and the reactive gas can be converted into a plasma state, thereby forming a metal nitride coating on the substrate; a carbon layer containing a carbon-containing gas is formed A gas is introduced into the reaction chamber; and a voltage is applied to the reaction chamber so that the carbon-containing gas can be converted into a plasma state, thereby forming a carbon coating on the metal nitride coating.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2015-0025293 filed on February 23, 2015, the entire contents of which are hereby incorporated by reference. technical field [0003] The present disclosure relates to methods of coating separators for fuel cells, and separators for fuel cells. Background technique [0004] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0005] A fuel cell stack can be divided into repetitive stacked components, such as electrode membranes, separators, gas diffusion layers, and gaskets, and non-repetitive components, such as the bonding system required for bonding laminated modules , the housing used to protect the stack, to provide the components needed to interface with the vehicle, and the high voltage connector. A fuel cell stack is a system in which hydrogen gas reacts w...

AI Technical Summary

Problems solved by technology

When metal separators without surface treatment are used, metal corrosion occurs and oxides generated on the metal surface function as electrical insulators, resulting in deterioration of electrical conductivity

In addition, positive metal ions dissociated and released at that time contaminate the MEA (Membrane Electrode Assembly), leading to deterioration in the performance of the fuel cell

[0007] In the case of typical carbon-based fuel cell separators, there is a high risk that cracks created during handling can remain in the internal parts of the fuel cell, making it difficult to form a film in terms of its strength and gas permeability, problems such as processability

[0008] In the case of a metal separator, although it shows good moldability and productivity due to its excellent ductility, and allows thin film formation as well as miniaturization of stacks, it can cause contamination of the MEA due to corrosion, and Increased contact resistance due to oxide film formed on its surface, resulting in deterioration of the performance of the stack

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