Gas Diffusion Layer

Category Fuel Cell Components

Carbon paper and cloth are treated with PTFE to increase their hydrophobicity and mechanical strength. This process also helps to remove product water. For both carbon cloth and carbon paper, the PTFE loading range is between 5 and 25 percent.

The available PTFE loading is in the range of 5 to 25% for both carbon cloth and carbon paper.

♦ Carbon Cloth : Grade Avcarb 1071,

♦ Carbon paper : Toray TGPH 60 and TGPH 120

Overview

Micro-porous layer coated GDL

The function of a gas diffusion layer is to evenly disperse the reagent throughout the active area of the electrode, regulate the level of water and heat within the catalyst layer, and enhance the electrical connection between the electrodes and the bipolar plates.
The micro-porous layer covered with carbon on carbon cloth and carbon paper typically consists of 2 to 6 mg/sq.cm and 0.6 to 1.5 mg/sq.cm, respectively. Furthermore, the company produces goods according to the specifications provided by the customers. The gas diffusion layer is utilized in various other electrochemical applications like metal-air batteries, super capacitors, microbial fuel cells, and so on.

Carbon cloth: Single and double side coated

Specifications

	Gas Diffusion Layer Properties	Gas Diffusion Layer Properties
Material Type	Carbon paper	Carbon cloth
Thickness	270 microns ± 15 microns	360 microns
Air Permeability	0.2-0.4 cm3/cm2*s	0.6-0.8 cm3/cm2*s
Areal weight	125 ± 5 grams /m2	230 ± 5 grams/m2
Compressibility	Ca 10% @ 1 Mpa	Ca 15% @ 1 Mpa
Electrical Resistivity (through plane)	< 11 mΩcm² (milliohms cm²)	< 13 mΩcm²
IP Pressure Drop	0.5 bar @ 1 Mpa	0.3 bar @ 1 Mpa
Electrical Resistivity (through plane)	< 11 mΩcm² (milliohms cm²)	< 13 mΩcm²
Substrate PTFE Treatment	Minimum 5 to 10 %	Minimum 15 to 20 %
Microporous Layer	Yes, on one side	Yes , on catalyst side