Application - Alkaline Electrolyzer
Nickel mesh electrodes for alkaline water electrolysis.
Three nickel components. One cell. Get any of them wrong and the whole stack underperforms. Alkaline water electrolysis runs at 80–90°C in 25–30% KOH — conditions that chew through carbon steel in weeks and pit stainless within months. Nickel survives here. Not because it's inert (it isn't — Ni forms a protective NiO/Ni(OH)₂ surface film that self-heals in alkaline electrolyte) but because after 15 years of supplying AWE OEMs, we've learned that substrate geometry is just as important as metallurgy. A 0.01mm wire diameter deviation shifts open area by 2–3 percentage points. That's 50mV per cell. Across a 200-cell stack, that's 10 volts — the difference between a competitive LCOH and a project that doesn't pencil out.
22,200/mo
Top keyword
30-40 mesh
Electrode spec
60,000+h
Target lifetime
Three electrode positions
One cell, three nickel mesh applications.
Catalyst Support Substrate
Woven nickel mesh (30-40 mesh, 0.25-0.30 mm wire, plain weave, Ni201 grade, electropolished finish) as the mechanical substrate for Raney nickel catalyst coating. Ordered aperture geometry ensures identical electrical path length and catalyst loading across every unit cell of the electrode. ASTM B456 and ISO 9044 compliant.
Porous Transport Layer
Knitted nickel mesh (660-850 g/m2, 90-95% porosity, single jersey knit, Ni201 grade) as the compressible PTL between bipolar plate and electrode. The three-dimensional loop structure acts as an elastic spring - compresses under 5-15 bar stack clamping force, maintains electrical contact, and recovers when force is released. Interlock knit for large-area stacks.
Current Collector Lead Wire
Nickel wire (Ni201 grade, annealed temper, 0.5-2.0 mm diameter) connecting electrode elements to the busbar. Ni201 low-carbon grade prevents grain-boundary carbide precipitation that causes intergranular corrosion in Ni200 after 20,000+ hours in hot KOH. Minimum 30% elongation for forming and welding.
EEAT case study - Failure analysis
Creep-rupture at grain boundaries: why Ni201 matters for stack lifetime.
Nickel mesh electrodes in alkaline electrolyzers operating at 80-90 C in 30% KOH develop intergranular cracks after 30,000-50,000 hours when Ni200 (0.15% C max) is used. Post-mortem analysis reveals grain-boundary carbide precipitation (Ni3C) selectively attacked by hot KOH, creating a network of microscopic corrosion fissures at every wire crossover point. The combined creep-corrosion mechanism - tensile stress from stack compression opening fresh surface while KOH dissolves the carbide phase - accelerates degradation exponentially once initiated.
Root cause
Carbon content above 0.02% in Ni200 wire forms grain-boundary Ni3C precipitates. Hot KOH selectively dissolves carbides, initiating intergranular corrosion at approximately 900 wire contact points per cm2 of electrode area.
RAS solution
Specify Ni201-grade nickel mesh (0.02% C max) for all electrode components immersed in KOH above 80 C. Use interlock knitted mesh in high-stress PTL positions. Maintain wire diameter at or above 0.25 mm to reduce local stress at weave crossover points.
Outcome
Ni201 electrode substrates consistently exceed 60,000-hour lifetimes in field service. Carbon-controlled nickel eliminates the grain-boundary corrosion pathway. Combined with electropolished surface finish, electrode degradation rates are reduced by over 80% compared to standard Ni200 substrates.
Spec your AWE electrode mesh
Send us your current density, KOH concentration, and active area. We return a matched weave recommendation within one business day.
What is Alkaline Electrolyzer Nickel Mesh?
Alkaline electrolyzer nickel mesh is the electrode substrate system used in alkaline water electrolysis (AWE) cells operating at 80-90°C in 25-30% KOH — the conditions under which carbon steel fails in weeks and stainless steel pits within months, while nickel's self-healing NiO/Ni(OH)₂ surface film keeps conducting. Each cell uses three nickel components: a woven Ni201 mesh catalyst support substrate (30-40 mesh, 0.25-0.30 mm wire), a knitted Ni201 mesh porous transport layer (660-850 g/m²), and Ni201 annealed lead wire — a combination with field lifetimes exceeding 60,000 hours.
Key facts
Electrode spec
30-40 mesh woven Ni201 substrate
Target lifetime
60,000+ hours (Ni201, electropolished)
Degradation cut
Over 80% lower vs standard Ni200 substrates
Recommendation lead time
Matched weave proposal within 24 hours on working days
Related products & resources
Selection guide
The table below compares the options most often quoted for alkaline electrolyzer nickel mesh enquiries.
| Cell position | Recommended spec | Why |
|---|---|---|
| Catalyst support substrate | Woven 30-40 mesh, 0.25-0.30 mm wire, plain weave, Ni201, electropolished | Ordered aperture geometry gives uniform current density and catalyst loading |
| Porous transport layer (PTL) | Knitted 660-850 g/m², 90-95% porosity, single jersey (interlock above 0.8 m²) | Elastic spring-back maintains contact under 5-15 bar stack compression |
| Current collector lead wire | Ni201 annealed, 0.5-2.0 mm diameter, min 30% elongation | Low-carbon grade prevents intergranular corrosion in hot KOH |
How to request a quote
- Step 1
Send your specification — product family, grade (Ni200/Ni201/N6), mesh count or packing density, wire diameter, quantity and certification standard.
- Step 2
Our applications team reviews the requirement and replies within one business day — within 24 hours on working days — with availability, lead time and pricing.
- Step 3
Confirm the proforma invoice; a sample Mill Test Certificate (EN 10204 3.1) is included with the quote, and a free 100×100 mm sample is available for standard mesh specifications.
- Step 4
Production, inspection and shipment proceed with the full documentation package — 100% of shipments include the lot-specific MTC.
Certification & traceability
Manufacturing is ISO 9001:2015 certified, and 100% of shipments include an EN 10204 3.1 Mill Test Certificate — OES chemistry, laser micrometer wire trace, optical mesh count and ASTM E8 tensile results — with a traceable heat number on every roll. Technical enquiries receive a substantive reply from a named materials engineer within one business day (within 24 hours on working days), and a sample MTC is included with every quote so your quality team can verify the documentation format up front.
Standards & references
ASTM International · International Organization for Standardization
Page last updated: 2026-09-28
Frequently Asked Questions (FAQ)
What mesh count is best for an alkaline electrolyzer PTL?
For the porous transport layer, knitted Ni201 mesh at 660-850 g/m² with 90-95% porosity is the standard choice; above roughly 0.8 m² active area, specify interlock knit at 850-1,150 g/m² for crush resistance. For the catalyst-support substrate, 30-40 mesh woven plain weave with 0.25-0.30 mm wire is typical.
Why does wire diameter tolerance matter so much for cell voltage?
A 0.01 mm wire diameter deviation shifts open area by 2-3 percentage points, worth roughly 50 mV per cell. Across a 200-cell stack that is about 10 volts - the difference between a competitive LCOH and a project that does not pencil out.
Which nickel grade survives 80-90°C operation in 25-30% KOH?
Ni201 (0.02% C max). Ni200 develops grain-boundary Ni3C precipitates that hot KOH selectively dissolves, causing intergranular cracking after 30,000-50,000 hours. Ni201 substrates consistently exceed 60,000 hours in field service.
How long do nickel mesh electrodes last in an AWE stack?
With a Ni201 substrate, electropolished finish and wire diameter at or above 0.25 mm, electrode degradation rates drop by over 80% compared with standard Ni200, and field units exceed 60,000 operating hours.
What information do you need to recommend a matched weave?
Send your current density, KOH concentration and active area. We return a matched weave recommendation covering substrate, PTL and lead wire within one business day.