GDL for Electrochemical CO2 Reduction - SGL 28 BC with additional 2.5 wt% FEPD 121 Wet Proofing

Brand: Fuel Cell Store
Product Code: 7302028

From $244.00

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Electrochemical reduction of CO2 (carbon dioxide) to valuable products such as carbon monoxide, hydrocarbons, alcohols, and acids would require a novel gas diffusion layer that minimizes the electrolyte seepage into the cathode GDL and prevents the flooding of the catalyst layer as much as possible in order to yield a stable electrochemical operation for the cell.  None of the existing commercial GDLs are suitable for electrochemical CO2 reduction since they are mostly engineered to work with standard PEM fuel cells, PEM electrolyzers, and other similar technologies where the input is either gaseous or aqueous (mostly deionized water).  Fuel Cell Store recognizes that there is no commercial GDL products that is targeted for electrochemical CO2 reduction field and offers this developmental GDL to researchers in this field. 

Sigracet 28 BC is a non-woven carbon paper with a Microporous Layer (MPL). It has a total thickness of 235 um (microns). The substrate and microporous layer sections of this GDL has two separate PTFE wet proofing values that is optimized for PEM fuel cells with gaseous reactants.  One of the most significant advantages of SGL 28 BC for electrochemical CO2 reduction experiments is the dense microporous layer for its microstructure and low number of surface defects (also known as mud-cracking features).  A dense microporous layer will naturally prevent the electrolyte seepage into the catalyst layer and center portion of the GDL itself, enhance the reactant dispersion, provide improved electrical conductivity.  Low number of surface defects on the microporous layer will further reduce the electrolyte seepage by eliminating the large pore sized locations.  Due to these advantages, SGL 28 BC is unique GDL product with greater potential for electrochemical CO2 reduction experiments.  Since most electrochemical CO2 reduction technologies are either using alkaline electrolytes, further modification of the SGL 28 BC is needed to further increase its hydrophobicity.   Fuel Cell Store is currently offering 28 BC GDL with various FEPD 121 wet proofing in the range of 1 wt% to 90 wt%.  Fuel Cell Store's wet proofing method does not vary the original microstructure or 3-dimensional property of the SGL 28 BC and simply further increases the PTFE content.  After the final curing step, FEPD 121 resin gets converted to an advanced form of PTFE with water contact angle >130 º and this is usually a function of the FEPD 121 percentage.  Higher % value of FEPD 121 will achieve higher level of hydrophobicity or higher water contact angles. Chemical structure of FEP 121 resin that enables higher degree of hydrophobicity for SGL 28 BC is given below.

Since the offered product is still developmental, some of the specifications are still undetermined.  Fuel Cell Store do welcome the comments/recommendations from the researchers that would purchase this product in order to further develop certain aspects that would eventually yield an excellent performance for the intended application.  This developmental GDL for electrochemical CO2 reduction has not been tested for the stated application due to limited testing capability in our facilities.  There is a growing number of literature that shows standard 28 BC GDL being used for electrochemical CO2 reduction experiments and Fuel Cell Store is simply trying to support the researchers by manufacturing modified versions of the standard 28 BC with additional PTFE content that would resolve some of the observed limitations with the standard GDL. Fuel Cell Store highly recommends that researchers investigate the performance of different FEPD 121 levels in order to find the one that suit their application and operational conditions best.

Gas Diffusion Layer Properties
Material Type Carbon Fiber Paper
Thickness 235 microns +/- 25 microns
Areal Weight ~ 105 +/- 10 g/m²
Bending Stiffness (MD/TD) Not determined
Gas Permeability Not determined
Compressibility ~ 11% (at 1 MPa)
Electrical Resistivity (through plane) Not determined
Water Contact Angle (MPL) > 130°
Roughness (MPL side) Not determined
Impurities (Fe, Co, Ni) < 10 ppm
Tensile Strength 6.6 / 5.1 MPa (MD/TD)
PTFE Treatment Standard 28 BC with additional 2.5 wt% FEPD 121
Microporous Layer Yes, on one side
Other Plate Properties
Thermal Conductivity Not determined

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