Gas diffusion layer for fuel cell, comprising spun carbon nanofiber layer

Abstract

The present invention relates to a gas diffusion layer including a carbon nanofiber spun layer for a fuel cell, a membrane-electrode assembly including the gas diffusion layer for a fuel cell, and a fuel cell including the membrane-electrode assembly.

Description

TECHNICAL FIELD[0001]The present invention relates to a gas diffusion layer including a carbon nanofiber spun layer for a fuel cell, a membrane-electrode assembly including the gas diffusion layer, and a fuel cell including the membrane-electrode assembly.[0002]This application claims the benefit of Korean Patent Application No. 10-2017-0080431 filed on Jun. 26, 2017, and the entire contents of which are incorporated herein by reference.BACKGROUND ART[0003]A fuel cell is an electrochemical cell that converts chemical energy produced by oxidation of fuel into electrical energy. Recently, various investigations have focused on the development of fuel cells as well as solar cells and the like in order to overcome problems such as consumption of fossil fuels, the greenhouse effect and global warming caused by carbon dioxide, and the like.[0004]A fuel cell generally converts chemical energy into electrical energy through oxidation and reduction of hydrogen and oxygen. In the fuel cell, h...

AI Technical Summary

Benefits of technology

The carbon nanofiber spun layer ensures efficient gas flow, water discharge, and heat management, preventing electrolyte membrane drying, thereby improving power generation efficiency and maintaining high ion conductivity in fuel cells.

Problems solved by technology

Therefore, the gas diffusion layer of the conventional fuel cell has problems in that the electrolyte membrane is dried and the heat generated by the electrochemical reaction is not smoothly discharged when the gas diffusion layer has the increased porosity for promoting the inflow of the reaction gas and promoting the discharge of the condensed water.

These problems result in a limitation that the gas diffusion layer cannot have a high porosity above a certain level and that the electric conductivity is low so that the power generation efficiency cannot be increased.

However, there is a problem in that the pores of the electrolyte membrane are unevenly distributed so that the reaction gas cannot flow smoothly to reduce the power generation efficiency, and there is a difficulty in thickness control due to the multilayer laminated structure.

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