Are electrodes replaceable?

Professional machines often have replaceable stack cartridges. Consumer machines are typically factory-serviced.

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Level 3 · Advanced· 4 min read·Updated 2026-06-27

Electrodes

PEM electrodes carry catalyst on both sides of the membrane: platinum on the cathode side, iridium oxide on the anode side. Coating quality drives lifespan.

Key takeaways

Cathode: platinum-on-carbon for H₂ evolution.
Anode: iridium oxide for O₂ evolution.
Catalyst loading and uniformity determine lifespan.

Why coatings fail

Mineral contamination from the wrong water, repeated thermal cycling and improper shutdown sequences all degrade catalyst layers over time. Quality machines sequence shutdown to protect the electrodes.

Frequently asked questions

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