Hydrogen briefs love nameplate megawatts and offtake MoUs. Anion-exchange membrane (AEM) stacks that avoid scarce platinum-group catalysts are an attractive manufacturing story—especially when electrodes move from lab coaters to roll-to-roll lines measured in hundreds of meters. That is the industrial gate. A beautiful polarization curve does not ship if coating thickness, adhesion, and defect density cannot hold across a web at speed.
Industrial hydrogen process-heat briefs own what hydrogen does in furnaces. Sodium-ion assembly briefs own system packaging honesty. This brief owns electrolyzer electrode manufacturing as the thing that turns chemistry into CapEx you can schedule.
What roll-to-roll actually has to control
R2R electrode lines inherit converting-industry disciplines:
- Coat weight / thickness uniformity across width and length.
- Web handling — tension, wrinkles, edge trim that become scrap or stack leaks later.
- Drying and curing that do not invent cracks or binder migration.
- In-line metrology that can stop the line before kilometers of bad electrode exist.
- Genealogy — which roll meters entered which stack serials.
Without those, “U.S.-made 1 MW stack” is a prototype narrative wearing a factory lease.
Meters of web are the real capacity unit—not slide megawatts.
If coat weight is a lab coupon ritual, stack yield is folklore.
Manufacturing questions buyers should ask early
| Claim | Industrial question | | --- | --- | | “Earth-abundant catalysts” | Stable supply and impurity specs at coating volumes? | | “Longest durability reported” | On which electrode lot genealogy, under which duty cycle? | | “Pilot-to-scale complete” | What defect classes still escape in-line inspection? | | “1 MW stack” | Electrode meters per MW and scrap factor at current line speed? |
Pilot coaters forgive sins that production webs punish. Plants that scale without metrology buy scrap that looks like “stack assembly problems” downstream.
Adjacent fences
Hydrogen process heat owns end use. Electrode boilers and heat pumps own electrified steam. BESS and flow batteries own storage. Specialty gas fab briefs own neon/helium. This page owns AEM electrode R2R as hydrogen manufacturing. Do not celebrate a stack demo and discover coating uniformity was never a process capability index.