Green hydrogen production
Currently, Alkaline Water Electrolysis (AWE) and Polymer Electrolyte Membrane Water Electrolysis (PEMWE) are mainly used as green hydrogen production technologies, and it is expected that Anion Exchange Membrane Water Electrolysis (AEMWE) will be added from 2025.
AWE
| Alkaline Water Electrolysis AWE |
|---|
|
Cathode : Ni, Co or Fe
Anode : Ni |
|
Lye : 25-30% Potassium
Hydroxide solution in water |
| 100% Electrical power |
| 0.3 ~ 1.0 A/㎠ |
| Hydrogen |
| Up to 40 bar |
| ~80℃ |
AEM
| Anion Exchange Membrane / Alkaline Electrolyte Membrane AEM |
|---|
|
Cathode : Ni / Ni alloys
Anode : Fe, Ni, Co oxides |
| Anion Exchange ionomer(e.g. AS-4) |
| 100% Electrical power |
| 0.5 ~ 1.5 A/㎠ |
| Hydrogen |
| Up to 35 bar H2, 1 bar O2 |
| ~60℃ |
PEM
| Polymer Electrolyte Membrane / Proton Exchange Membrane PEM/PEMEC |
|---|
|
Cathode : Pt / Pd
Anode : IrO2 / RuO2 |
|
Fluoropolymer ionomer
(eg Nafion, a DuPont brand) |
| 100% Electrical power |
| Up to 3 A/㎠ |
| Hydrogen |
| Up to 40 bar |
| ~60℃ |