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05/11/2023

Compare Alkaline Electrolyzer and PEM Electrolyzer

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

 

 

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