Type

Operating Temperature [˚C] [5]

Operating Pressure [Bar] [5]

Cathode Gas

Membrane and Electrolyte

Anode Gas

Acidic (PEM)

40 - 80

<30

H2

Polymer Electrolyte Membrane (PEM) NafionÒ H+

O2, H2O

Alkali (AEL)

65 - 220

<30

H2, H2O

KOH Electrolyte

OH

O2, H2O

Solid Oxide (SOEC)

600 - 1000

<101

H2, H2O

ZrO2, La0.8Sr0.2Ga0.8Mg0.2O3

O2−

O2