Titanium fiber felt gas diffusion layer
TiTime Titanium Fiber Felt Gas Diffusion Layer (GDL/PTL) for PEM Electrolyzers & PEM Fuel Cells – 2025 Ultimate Edition
TiTime is the global No.1 supplier of titanium fiber felt gas diffusion layers, with cumulative shipments exceeding 1.2 GW-equivalent as of November 20, 2025. Our titanium fiber felt is the industry-standard anode-side PTL for all leading PEM electrolyzer manufacturers (Longi, Sungrow, Cummins Accelera, Electric Hydrogen, Plug Power, Ohmium, etc.) and is rapidly replacing carbon paper in high-durability PEM fuel cells.
Why Titanium Fiber Felt Has Completely Replaced Carbon Paper on the Anode Side
Carbon-based GDL is irreversibly oxidized to CO₂ within hours at >1.6 V in PEM electrolysis environment. Titanium fiber felt is the only material that simultaneously achieves:
- Porosity 60–80% (optimal bubble detachment)
- Electrical conductivity >2,000 S/cm (lower than bulk Ti but 50× better than sintered powder plates)
- Corrosion current <1 μA/cm² at 2.2 V, 90°C for >80,000 hours
- Compressive strength >15 MPa under 5 MPa stack pressure without collapse
- Mirror-smooth surface (Ra <2 μm) after calendering → protects ultra-thin membranes (<10 μm)
TiTime Titanium Fiber Felt Technical Specifications (2025 Commercial Grade)
| Parameter | TiTime Standard Series | TiTime Ultra Series | Unit |
|---|---|---|---|
| Thickness | 0.125 / 0.20 / 0.25 / 0.30 / 0.40 / 0.50 / 0.60 / 0.80 | 0.15 / 0.20 / 0.25 | mm |
| Porosity | 65–80% | 68–78% | % |
| Average fiber diameter | 20–50 μm | 15–30 μm | μm |
| Air permeability | 5–35 L/dm²·min | 8–25 L/dm²·min | |
| Surface roughness Ra (calendered side) | ≤3 μm | ≤1.5 μm | μm |
| In-plane resistivity | ≤5 mΩ·cm | ≤4 mΩ·cm | mΩ·cm |
| Through-plane resistivity | ≤15 mΩ·cm | ≤12 mΩ·cm | mΩ·cm |
| Platinum coating (optional) | 50–300 nm, zero pinhole | 80–200 nm gradient | nm |
| Max dimension | 1200 × 800 mm | 1000 × 600 mm | mm |
Performance Validation
- Longi 2.5 MW single stack: TiTime 0.25 mm titanium felt + 120 nm Pt → 1.74 V @ 4 A/cm², 80°C, >18,000 h with <2% degradation
- European 100 MW project: TiTime Ultra 0.20 mm felt → 1.69 V @ 5 A/cm², 90°C, 8,000 h stable
- PEMFC automotive stack: 0.30 mm titanium felt replacing carbon paper on cathode → power density +12%, cold-start performance improved 40%
TiTime Exclusive Technologies
- Vacuum multi-stage sintering + precision calendering → industry’s smoothest surface
- Pulsed electrophoretic platinum deposition → 100% pinhole-free, adhesion >45 N
- Gradient porosity design (dense layer facing catalyst, coarse layer facing bipolar plate) → lowest mass transport loss
- Optional PTFE hydrophobic treatment (1–5 wt%) for PEMFC cathode application
TiTime titanium fiber felt is the only GDL/PTL material that can support both >5 A/cm² PEM electrolysis and >3 A/cm² high-power PEM fuel cells with single-layer design.
TiTime – Global leader in titanium fiber felt GDL/PTL. 2 GW annual capacity ready in 2026.
Contact: info@titimecn.com
Website: www.titime.com
