0.2mm Thickness Sintered SS316L Fiber Felt For AEM Electrolyzer

TOPTITECH's 0.2mm Thickness Sintered SS316L Fiber Felt for AEM Electrolyzer serves as a critical porous transport layer (PTL) and gas diffusion layer (GDL) within anion exchange membrane water electrolysis systems, specifically engineered to optimize the two-phase flow dynamics at the anode side. Manufactured from micron-diameter 316L stainless steel fibers via high-temperature vacuum sintering, this ultrathin material achieves a porosity exceeding 75% alongside a three-dimensional, non-woven fibrous network. This specific architecture ensures an optimal balance between cross-plane permeability for effective hydroxide ion transport and in-plane electrical conductivity for minimal ohmic losses. Unlike woven meshes or sintered powders, this fiber-based felt delivers a higher specific surface area for catalyst adhesion while maintaining the mechanical compliance required for intimate membrane-electrode assembly (MEA) contact under operational compression.

TOPTITECH's 0.2mm thickness Sintered SS316L Fiber Felt for AEM Electrolyzer leverages the inherent corrosion resistance of 316L stainless steel in the alkaline environment, providing a cost-effective alternative to nickel or titanium-based PTLs without compromising durability at typical AEM operating temperatures up to 60°C. Its gradient pore structure facilitates rapid gas bubble detachment from the catalytic sites, significantly reducing mass transport overpotentials at elevated current densities. Furthermore, the felt's smooth, burr-free surface finish prevents mechanical abrasion of the AEM membrane, while its high dirt holding capacity ensures stable long-term performance by mitigating fouling from feedwater impurities. This material is available in customizable dimensions, allowing seamless integration into both laboratory-scale R&D cells and industrial-scale electrolyzer stacks for green hydrogen production.

• Material: SS316L
• Size: 100x100mm
• Thickness: 0.2mm
• Pore size: 20um
• Porosity: 70%
• Technique: Sintering

Superior Electrical Conductivity and Low Ohmic Losses

 

The three-dimensional, non-woven fiber network creates an uninterrupted conductive pathway throughout the material. This sintered structure ensures excellent in-plane and through-plane conductivity, minimizing ohmic overpotentials and enabling efficient electron transfer from the catalyst layer to the bipolar plate during high-current-density operation.

High Porosity for Optimized Two-Phase Flow

 

With a porosity of 70%, this felt provides a highly permeable medium for electrolyte penetration and efficient gas bubble detachment . The high void volume significantly reduces mass transport overpotentials by facilitating the rapid removal of oxygen gas from the anode active sites, ensuring stable performance even at elevated current densities.

Robust Mechanical Strength and Structural Integrity

 

The metallurgical sintering bonds at fiber intersection points create a rigid, self-supporting structure that withstands the compressive forces during stack assembly. This mechanical compliance ensures intimate, uniform contact with the membrane without brittle fracture or plastic deformation, maintaining consistent performance over prolonged operation.

Cost-Effective Material Selection for Alkaline Environments

 

Engineered from 316L stainless steel, this felt presents a significantly more economical alternative to nickel or titanium-based PTLs. In the benign alkaline environment of an AEM electrolyzer, 316L provides sufficient corrosion resistance and thermal stability up to 600°C, offering a high-performance solution at a fraction of the material cost.

Anode Porous Transport Layer (PTL) for Oxygen Evolution Reaction (OER)

In AEM water electrolysis, this 0.2mm sintered SS316L fiber felt functions as the primary porous transport layer (PTL) on the anode side, positioned between the catalyst layer and the bipolar plate . Its high porosity (70%) and three-dimensional non-woven network facilitate efficient two-phase flow, allowing electrolyte penetration while enabling rapid oxygen gas bubble detachment from the active sites . This minimizes mass transport overpotentials and ensures stable operation at elevated current densities up to several amperes per square centimeter .

Integrated OER Electrocatalyst and PTL (Catalyst-Free Configuration)

Recent research demonstrates that stainless steel felt exhibits inherent electrocatalytic activity toward the oxygen evolution reaction (OER) in alkaline environments . This 0.2mm SS316L fiber felt can serve as a combined OER electrocatalyst and porous transport layer without additional catalyst coating, achieving 1 A cm⁻² at 1.74 Vcell in AEM electrolyzers . This bifunctional capability simplifies electrode architecture, reduces precious metal catalyst usage, and provides a cost-effective platform for membrane-electrode assembly (MEA) development.

Zero-Gap Cell Assembly Component

The 0.2mm thickness is specifically engineered for zero-gap cell configurations in AEM electrolyzers, where intimate contact between the membrane, catalyst layer, and PTL is critical for minimizing ohmic losses . This ultrathin felt provides the necessary mechanical compliance under stack compression while maintaining structural integrity, ensuring uniform current distribution across the active area and reducing contact resistance with adjacent components .

Cathode Substrate for Hydrogen Evolution Reaction (HER)

On the cathode side, this sintered SS316L fiber felt serves as a conductive substrate and gas diffusion layer for the hydrogen evolution reaction (HER) . Its high specific surface area provides anchoring points for HER catalysts, while the porous network enables efficient hydrogen gas removal from the catalyst layer . The material's corrosion resistance in the alkaline cathodic environment ensures long-term durability during continuous hydrogen production .

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