Titanium Fiber Felt (Pt cover on both side is available)---The
Ideal Anode Diffusion Layer Application Materials For PEM Hydrogen
Production
Hydrogen can be used as a clean and renewable green energy, and
Proton Exchange Membrane water electrolysis (PEMWE) to produce
hydrogen is one of the main methods for hydrogen production. The
technology uses the proton exchange membrane (PEM) as a solid
electrolyte to replace the alkaline electrolyte and diaphragm, and
uses pure water as the electrolyte.
In the PEM water electrolysis hydrogen production device, the
membrane electrode composed of the diffusion layer (Gas Diffusion
Layer, GDL), the catalytic layer and the proton exchange membrane
is the main place for the electrochemical reaction of the
electrolytic cell, and is the core component of PEMWE.
The Gas diffusion layer(GDL) not only has the functions of
supporting the Catalyst Coated Membrane (CCM), evenly distributing
the reaction water, and discharging the generated gas in time, but
also can realize functions such as conducting current, and is one
of the key components affecting the performance of the electrolytic
cell.
A good diffusion layer material should have the following
characteristics:
1) Good electrical and thermal conductivity, the contact resistance
between the electrode catalysts can be kept at a low level to
reduce the electrolysis overpotential;
2) Strong acid corrosion resistance, the diffusion layer of the
anode should have good resistance to oxidation corrosion in order
to overcome the long-term contact oxygen evolution reaction, while
the cathode
The extremely diffusion layer should be resistant to hydrogen
embrittlement in order to overcome the long-term exposure to
hydrogen evolution reaction;
3) Porous and elastic, since the diffusion layer is close to both
sides of the membrane electrode and plays a supporting role for the
membrane electrode, it can withstand a certain pressure;
4) Long service life and cheap price.
In the comparison of titanium fiber felt, sintered titanium plate
and carbon paper as anode diffusion layer, it is found that
titanium fiber felt has the best electrolytic performance, the
smallest ohmic resistance and good stability, so titanium fiber
felt is more suitable as the anode diffusion layer of PEMWE.
Key words:
★ Uniform pore size distribution
★ strong corrosion resistance
★ good water permeability
★ high porosity
★ good heat dissipation
★ high current density
★ low voltage
★ stable performance and long service life.
