Ir-Ta, Ru-Ir and platinized titanium electrodes for PEM and alkaline electrolysers, green hydrogen, battery supply chains and Power-to-X. Dimensionally stable, high-current-rated and fully documented — so energy efficiency, cell life and system CAPEX stay under control.
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Green hydrogen, battery materials and Power-to-X all end at the same place: an electrochemical cell where current is exchanged across a coated titanium surface. In a PEM electrolyser the iridium-based anode is the most expensive single element per square metre in the stack — and the one that decides overpotential, efficiency and lifetime.
The whole economics sit on the coating. A correct Ir-Ta MMO coating holds a stable oxygen-evolution potential for 3–8 years at 0.5–2 kA/m², while a poor coating drifts in potential, dissolves in the acid medium, and dies in months. Coating formulation, precious-metal loading and substrate surface finish decide whether your stack makes hydrogen or a repair bill.
Four failure modes dominate real installations — from PEM stacks to alkaline cells. Each one is preventable with the right coating and cell design.
PEM anodes run in strong acid at high current density. A coating with high oxygen-evolution overpotential wastes voltage as heat and dissolves faster — the stack degrades cell by cell.
Solar and wind supply is cyclic. Repeated load ramps, partial-load periods and standby all oxidise the coating and lift it from the substrate unless the electrode is rated for your duty profile, not just peak amperage.
Trace metal ions and chlorides in impure feed water or electrolyte deactivate noble-metal coatings, pushing cell voltage up and current efficiency down — often invisibly for months.
Iridium and platinum are the cost drivers of new-energy electrodes. Over-coating wastes precious metal; under-coating fails early. Correct loading verified per batch is the difference between optimised CAPEX and silent waste.
Match your electrolyte and duty to the correct coating and format. The table below is the fast path — our engineers refine it with your stack voltage, temperature and operating profile.
| Application | Recommended Anode | Coating | Current Density | Typical Life | Key Benefit |
|---|---|---|---|---|---|
| PEM electrolysis — oxygen side | Ir-Ta MMO plate / mesh | IrO₂/Ta₂O₅ | 0.5–2 kA/m² | 3–8 yrs | Low OER overpotential in acid |
| PEM electrolysis — hydrogen side | Platinized Ti mesh | Pt | 1–5 kA/m² | 5–10 yrs | High HER activity, low contact loss |
| Alkaline electrolysis (KOH) | MMO-coated Ti plate | Ir-Ta | 0.2–1 kA/m² | 5–10 yrs | KOH corrosion resistance |
| PV / semiconductor wet processing | Platinized Ti mesh / plate | Pt | Up to 1 kA/m² | 5–10 yrs | HF-acid resistant, zero metal release |
| Battery & redox-flow systems | Ru-Ir MMO rod / mesh | Ru-Ir | 0.5–2 kA/m² | 3–8 yrs | Even current distribution |
| Power-to-X & CO₂ electrolysis | Ir-Ta MMO plate | Ir-Ta | 0.3–1.5 kA/m² | 3–8 yrs | Tailored gas-evolution behaviour |
Six core titanium electrode formats for PEM and alkaline electrolysers, hydrogen, battery supply chains and Power-to-X — each coated and rated to its electrolyte with traceable material and coating documentation.
High-stability iridium-tantalum anodes for the oxygen side of PEM and acid electrolysers, rated for low overpotential in concentrated acid.
| Substrate | Gr1 Ti plate / mesh |
| Coating | IrO₂/Ta₂O₅ |
| Current density | 0.5–2 kA/m² |
| Design life | 3–8 years at rating |
Ru-Ir coated rods for alkaline electrolysis, redox-flow and mixed-duty cells where balanced gas evolution and tolerance to cycling matter.
| Diameter | Φ16 – Φ32 mm |
| Coating | RuO₂/IrO₂ |
| Current density | 0.5–2 kA/m² |
| Design life | 3–8 years |
High-activity platinum coatings for hydrogen-side duty, fuel-cell components and HF-based PV and semiconductor wet processing.
| Substrate | Gr1 / Gr2 Ti mesh |
| Coating | Pt, 5–20 g/m² |
| Current density | Up to 5 kA/m² |
| Design life | 5–10 years |
High-porosity sintered titanium felt for the porous transport and gas diffusion layers of PEM electrolysers and hydrogen cells.
| Porosity | 60–80% |
| Thickness | 0.3–2.0 mm |
| Material | Gr1 Ti fibre |
| Format | Rolls · cut-to-size sheets |
The full mixed-metal-oxide family — plate, mesh, rod and tubular formats across Ru-Ir, Ir-Ta and custom loadings for energy and industrial duty.
| Formats | Plate · mesh · rod · tube |
| Coating | Ru-Ir / Ir-Ta / custom |
| Current density | 0.2–3 kA/m² |
| Design life | 3–10 years |
Ti mesh baskets, frames and current-distribution hardware for electrolyser stacks and cell banks, machined and welded to your geometry.
| Material | Gr1 / Gr2 Ti |
| Mesh type | Expanded · woven · welded |
| Finish | Passivated / coated on request |
| Design life | 10+ years structural |
Factory reference tables for the three core new-energy electrode formats. Other sizes, porosities and precious-metal loadings can be customised on request.
| Ir-Ta MMO Plate Anode (PEM Oxygen Side) | Size (mm) | Active Area (m²) | Current @ 1 kA/m² (A) | Ir Loading (g/m²) | Life (yrs) |
|---|---|---|---|---|---|
| Plate 100 × 100 | 100 × 100 × 2 | 0.02 | 20 | 10–30 | 3–8 |
| Plate 200 × 200 | 200 × 200 × 2 | 0.08 | 80 | 10–30 | 3–8 |
| Mesh 300 × 500 | 300 × 500 × 1.5 | 0.30 | 300 | 10–30 | 3–8 |
| Mesh 600 × 1200 | 600 × 1200 × 1.5 | 1.44 | 1440 | 10–30 | 3–8 |
| Platinized Titanium Anode (HER / HF Duty) | Pt Loading (g/m²) | Current Density (kA/m²) | Life (yrs) | Application |
|---|---|---|---|---|
| Mesh / plate / rod | 5–20 | 0.5–5.0 | 5–10 | Hydrogen evolution · PV / HF processing |
| Titanium Sintered Felt (PTL / GDL) | Thickness (mm) | Porosity (%) | Areal Weight (g/m²) | Application |
|---|---|---|---|---|
| 0.3 mm felt | 0.3 ± 0.05 | 70–80 | 220–300 | PEM electrolyser PTL |
| 0.5 mm felt | 0.5 ± 0.05 | 65–75 | 400–520 | PEM electrolyser PTL / GDL |
| 1.0 mm felt | 1.0 ± 0.10 | 60–70 | 800–1000 | Alkaline & flow-through cells |
Every electrode ships with traceable substrate, coating and testing records aligned to ISO-style quality management — so stack integrators and plant owners can trust the efficiency, the lifetime and the audit trail.
All production runs under a certified quality management system with full batch traceability from titanium substrate to final test.
Titanium substrate to ASTM B265 Gr1 / Gr2 with chemical and mechanical traceability.
Coating thickness and iridium / platinum loading verified per batch — the parameters that actually control electrode lifetime and stack CAPEX in acid and alkaline duty.
Performance verified per NACE TM0108-2008 at elevated current density in the acid or alkaline electrolyte under rated conditions.
Third-party reports available on request for coating thickness, adhesion and precious-metal loading.
Certificate of conformity, packing list and inspection records prepared for project handover and audits.
Lifetime is verified by accelerated life testing — not field wait. We test at elevated current density in the media your stack actually runs, then convert the data to your operating rating.
| Coating System | Medium | Current Density (A/m²) | Temperature (°C) |
|---|---|---|---|
| Ir-Ta MMO | 1 mol/L H₂SO₄ (acid) | 20,000 | 40 ± 5 |
| Ir-Ta MMO | 30 wt% KOH (alkaline) | 10,000 | 60 ± 5 |
| Pt | 10% H₂SO₄ | 40,000 | 25 ± 5 |
Sustains efficient oxygen evolution in PEM and acid electrolysers without accelerated coating wear or voltage drift.
Coating formulations rated for concentrated acid (PEM) and hot KOH (alkaline) environments — the two pillars of green hydrogen.
Controlled precious-metal loading per batch keeps overpotential, efficiency and lifetime consistent across the whole stack.
Ir loading verified per batch — the loading level is what actually controls electrode lifetime and the iridium cost inside your stack.
Send us your stack details — electrolyser type, electrolyte, current density, cell dimensions and target lifetime — and our engineers will recommend the correct coating, electrode format and quantity within 24 hours.
Talk to an Engineer Email UsComplete the fields below and send — your requirements will open in WhatsApp so our engineers can reply directly.
Reliable hydrogen production is a system result — stack, electrodes, membrane, power conditioning, water feed and gas handling must work together. Ehisen supplies the coated electrodes at the heart of the current path.
The repeating cell unit where DC current splits water into hydrogen and oxygen. Stack geometry, compression and flow distribution control efficiency and lifetime.
The current-discharging elements — Ir-Ta MMO or platinized titanium in plate, mesh or felt format, rated to the electrolyte, temperature and current density of the stack.
The proton or ion exchange membrane separates the gases while titanium sintered felt distributes current and moves water and gas through the cell.
Ultra-pure water for PEM or 25–30% KOH for alkaline cells is circulated at controlled temperature and flow — feed purity directly controls coating life.
Rectifiers and DC-DC converters shape renewable power into stable, low-ripple cell current. Clean current keeps electrodes efficient and extends life.
Hydrogen and oxygen are separated, scrubbed and dried to specification. Cell voltage and gas purity are logged to verify stack performance per run.
Building or retrofitting an electrolyser follows a proven four-stage sequence. Ehisen supports you at every stage with engineering input and documented hardware.
Electrolyte, temperature, pressure, cell current, duty profile and target lifetime are reviewed, then electrode format, coating and precious-metal loading are calculated.
We recommend the coating system and can supply sample electrodes or sintered felt for testing in your actual cell environment before full production.
Electrodes are manufactured with batch traceability, coating inspection and accelerated life testing, with full process records shipped alongside.
Electrodes and PTLs are positioned, contact resistance verified, and cell voltage and gas output checked during the trial run until performance is stable.
Buyers choose Ehisen because coating consistency, traceability and engineering response decide how long a new-energy electrode really lasts — not just the catalogue price.
Coating applied on our own production line with a fixed formulation and controlled loading tolerance — samples and bulk runs are made to the same standard.
Every batch carries a LOT number linking substrate material, coating process records, inspection results and shipping documents.
Accelerated life testing per NACE TM0108-2008 at 10,000–20,000 A/m² in acid or alkaline media converts laboratory hours into your operating rating.
Our engineers review your electrolyte, current density, temperature and stack geometry, then recommend coating, format and loading — within 24 hours.
Export experience across 40+ countries with complete documentation: MTC, coating reports, XRF data, inspection records, certificate of conformity.
Production planned against your project schedule, with order status updates from coating to packing list.
A clear, three-step process keeps every new-energy order on specification and on schedule.
Share your electrolyser type, electrolyte, current density and target coating loading via WhatsApp or email — or send a cell drawing and we will extract the parameters.
Within 24 hours you receive a recommendation: electrode coating, format, dimensions, loading and the supporting calculation basis.
After approval, production runs with batch QC, then ships with the full document pack: MTC, coating report, XRF and ALT data and packing list.
Send us a message if you have any questions or request a quote. We will be back to you ASAP!
