Platinum-coated titanium felt is a specialized porous transport medium exclusively engineered to address the strict material requirements of modern PEM water electrolyzers. Produced by applying a uniform, thermally cured platinum coating on high-purity sintered titanium fiber felt, this material solves the most common drawbacks of conventional GDL materials used in proton exchange membrane electrolysis systems. Unlike disposable carbon paper that easily oxidizes, pulverizes and contaminates membranes under high-potential acidic environments, the titanium substrate provides stable structural rigidity and full corrosion resistance, while the platinum layer eliminates titanium surface passivation and drastically reduces interfacial contact resistance. As a functional PTL and GDL material for PEM electrolyzer cathodes, it ensures stable electrical conduction, reliable water delivery and unobstructed hydrogen gas release during continuous electrolysis operation.

Tailored specifically for green hydrogen production equipment, our platinum-coated titanium felt balances precise porous mass transfer performance and long-term electrochemical stability. Its interconnected 3D pore structure maintains consistent water-gas permeability under dynamic load fluctuations, effectively preventing water flooding and gas accumulation inside the electrode. The tightly bonded platinum coating further enhances hydrogen evolution reaction (HER) activity, delivering uniform current distribution and lowering overall cell voltage. It is widely recognized as a high-reliability material for PEM electrolyzer prototype development, laboratory electrochemical testing, and small-to-medium scale cathode stack assembly, offering far superior durability and repeatable performance compared with standard porous metal and carbon-based alternatives.

Products Specifications

Substrate Material	Grade 1 high-purity sintered titanium fiber felt (Ti ≥99.5%)
Filtration grade/Pore size	20μm uniform interconnected pores
Size	200 × 200 × 0.25 mm
Porosity	60% - 70%
Coating type	platinum
Coating thickness	0.5μm for double sides adjustable
Technique	Sintering

Working Principle in PEM Electrolyzer Cathode Stack

When installed as the cathode porous transport layer between MEA catalyst layer and titanium bipolar plate, our platinum-coated titanium felt undertakes three synchronized core tasks during water electrolysis.

First, the continuous titanium fiber skeleton acts as a stable conductive current collector. The dense platinum coating eliminates spontaneous TiO₂ passivation film on bare titanium fiber surface, maintaining low and stable interfacial resistance even under long-hour constant current operation, which avoids rising cell voltage caused by surface insulation.

Second, the 3D interconnected porous structure delivers deionized water evenly to the cathode catalytic sites for hydrogen evolution reaction, while quickly evacuating generated hydrogen bubbles out of the electrode area. Optimized pore distribution prevents bubble accumulation and gas blockage, effectively reducing mass transport polarization and improving overall hydrogen production efficiency.

Third, the soft, flat fiber surface buffers concentrated clamping pressure during stack assembly, eliminating sharp hard edges that scratch or puncture thin proton exchange membranes, extending the service cycle of complete MEA components.

Performance Benefits for PEM Electrolyzer

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Suppressed titanium passivation with ultra-low contact resistance

The fully covered platinum film blocks the spontaneous formation of insulating TiO₂ passive film on titanium fiber surfaces. Under standard stack clamping pressure of 2–4 MPa, through-plane resistance remains consistently low across the entire sheet, eliminating local hotspots and uneven current distribution, which directly cuts cell operating voltage and reduces power consumption for green hydrogen production.

Custom-tailored 3D gradient porous structure for efficient mass transfer

The sintered titanium fiber substrate features interconnected, evenly distributed pores with adjustable porosity. It creates smooth dual channels: one for transporting deionized water to HER catalytic sites, and another for rapid evacuation of generated hydrogen bubbles. This design effectively avoids gas accumulation, water flooding and mass transport polarization, maintaining high electrolysis efficiency even under dynamic fluctuating loads from renewable energy power supplies.

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Complete acid corrosion resistance without membrane contamination

Grade 1 pure titanium matrix delivers excellent stability in the weak acidic deionized water environment of PEM cathodes. It will not oxidize, pulverize or release metal impurity ions like disposable carbon paper. No particulate pollution will attach to proton exchange membranes, extending the whole service life of MEA and reducing equipment maintenance costs for manufacturers and research labs.

Optimized HER catalytic activity to simplify cathode formulation

The uniformly distributed platinum layer serves as an auxiliary hydrogen evolution catalyst. It improves reaction kinetics on the cathode side, allowing customers to appropriately reduce the loading of Pt/C catalyst on MEA and cut overall consumption of costly noble metals, achieving a balanced trade-off between electrolysis performance and raw material cost.

Flat soft fiber surface to protect fragile PEM membranes

Without rigid sharp edges found on woven titanium mesh, the fluffy fiber surface acts as a buffer layer between the bipolar plate and catalytic layer. It disperses concentrated assembly pressure evenly and prevents scratching or puncturing thin proton exchange membranes during stack tightening, lowering the reject rate of cell assembly.

Product Applications of Platinum-Coated Titanium Felt

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Our platinum-coated titanium felt is purpose-built to match the cathode operating environment of proton exchange membrane water electrolyzers, and it also covers a wide range of supporting electrochemical research scenarios. Its anti-passivation, conductive and corrosion-resistant properties make it a preferred porous transport layer (PTL) and gas diffusion layer (GDL) for green hydrogen production and electrochemistry R&D. All applicable scenarios are sorted by industry and technical use case as below:

1. Cathode PTL/GDL for PEM Water Electrolyzers

Cathode porous transport medium for laboratory single-cell PEM test fixtures
Cathode supporting material for small compact PEM hydrogen generators and portable hydrogen supply devices
Cathode assembly of pilot-scale PEM electrolysis stacks for green hydrogen demonstration projects
Electrode substrate for low-to-medium current density PEM electrolysis systems powered by wind and solar energy

2. Electrochemical Laboratory R&D & Prototype Verification

Short-term anode material performance screening for PEM electrolyzer material comparison tests
Reusable porous electrode substrate for electrochemistry cyclic voltammetry and aging testing
Test fixture consumables for university electrochemistry labs and new energy research institutes
Material iteration verification for PEM MEA manufacturers to optimize cathode catalyst matching

3. Auxiliary Components for Related Hydrogen Energy Equipment

Porous conductive buffer layer for unitized regenerative fuel cell (URFC) cathode testing
Corrosion-resistant gas diffusion media for small-scale alkaline electrolysis comparative experiments
Filter-conductive dual-function material for circulating deionized water pipelines inside electrolyzer stacks
Conductive substrate for hydrogen sensor electrochemical testing

FAQ

05 micron Platinum coated titanium felt for PEM electrolyzer

01.Where exactly can platinum-coated titanium felt be used in a PEM electrolyzer?

Platinum-coated titanium felt is primarily designed and optimized for PEM electrolyzer cathode PTL/GDL layers. The platinum coating effectively eliminates titanium passivation, reduces interfacial contact resistance, and enhances hydrogen evolution reaction (HER) efficiency. It is also acceptable for short-term laboratory anode testing and prototype validation.

02.Why use platinum-coated titanium felt instead of traditional carbon paper for PEM electrolyzers?

Unlike carbon paper, which easily oxidizes, pulverizes and causes membrane contamination in acidic electrolytic environments, platinized titanium felt features full acid corrosion resistance, stable mechanical structure and zero carbon precipitation. It maintains consistent conductivity under high current density and frequent start-stop cycles, offering longer service life and better stack stability for green hydrogen production.

03.Can platinum coating peel or fall off during electrolysis operation?

No. Our platinum layer is bonded through optimized processes, forming a stable metallurgical combination with the titanium fiber surface. The finished material passes strict adhesion tests and remains intact under long-term bubble scouring, continuous current loading and standard stack clamping pressure, with no peeling or flaking issues.

04.Does platinum-coated titanium felt help lower PEM electrolyzer cell voltage?

Yes. The uniform platinum coating eliminates the insulating TiO₂ passivation layer on bare titanium, greatly reducing contact resistance between the current collector and catalyst layer. Lower interfacial resistance stabilizes current distribution and effectively reduces overall cell voltage, improving hydrogen production energy efficiency.

05.Can you customize porosity, thickness and platinum loading for different PEM cell designs?

Yes. All core parameters are fully customizable. We adjust titanium felt substrate thickness, porosity and platinum coating loading to match your specific current density, water transport requirements and cell voltage targets, ensuring optimal gas-liquid mass transfer and conductivity for your PEM stack design.

06.What shapes and processing options do you offer for PEM stack assembly?

We provide standard sheets and discs, as well as fully customized cutting and shaping according to customer drawings. All finished parts maintain uniform pore distribution and coating consistency, fitting most laboratory test fixtures and industrial PEM electrolyzer stack structures.