Comparison between Alkaline Electrolyzer & PEM Electrolyzer
Here, the comparison between alkaline and PEM electrolyzer is given. The volume of the PEM electrolyzer is almost 1/3 that of alkaline electrolyzer.
Electrolyzer
Electrolyzer are technology for the production of low emission hydrogen from renewable electricity. India’s total installed capacity of hydrogen has reached 1 GW by the end of year 2022. The nation green hydrogen mission targets of 5 MMT ( millions metric tons ) by 2030 and to achieve 60 – 100 GW electrolyzer capacity needs to be installed.
|
Parameters |
Alkaline Electrolyzer |
PEM Electrolyzer |
|
Electrolyte
|
30%
weight KOH solution or 25% weight NaOH solution |
Solid
Polymer |
|
Current density ( A / m2 ) |
2000
– 4000 |
10000
– 20000 |
|
Working
Pressure (
MPa ) |
⩽ 3.2 Mpa |
⩽ 5 Mpa |
|
Operating
temperature (oC) |
80 – 90 |
50 – 80 |
|
Hydrogen
purity (%) |
⩾ 99.8 |
⩾ 99.99 |
|
Raw
material |
Deionized
water and alkali |
Deionized
water |
|
Corrosion
|
Alkaline
corrosion |
No |
|
Operating
characteristics |
Isobaric
operation |
Differential
pressure operation |
|
Volume
and weight |
Big
|
Small,
about 1/3 of the alkaline electrolyzer |
|
Manufacturing
cost |
Low
|
High
|
|
Life
time |
10
years |
3
– 4 years |
Incentive
For Electrolyser Manufacturers in India
Wind
Solar Hybrid Policy in India
Incentive
For Green Hydrogen Production in India
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