Gray hydrogen
Gray hydrogen is by-product hydrogen produced as a by-product of petrochemical or
steelmaking processes and extracted hydrogen produced through a catalytic reaction using fossil fuels.
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Water electrolysis
What is water electrolysis?
Water electrolysis technology refers to an environment-friendly energy production technology
that generates hydrogen and oxygen by electrolyzing water and moving ions to the separation membrane
There are four representative methods of water electrolysis technology.
Hydrogen energy production method
Hydrogen is divided into gray hydrogen, blue hydrogen, and green hydrogen
depending on the production method and raw material.
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Blue hydrogen
It is hydrogen that captures the carbon dioxide emitted when producing gray hydrogen
and does not release it into the atmosphere.
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Green hydrogen
Green hydrogen is a clean hydrogen that does not
generate carbon dioxide in the production process.
*Reforming: Change in properties or structure by the action of heat or catalyst
Types of water electrolysis
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01
Alkaline water electrolysis
Although low cost of equipment and simple structure, there is a disadvantage that hydrogen production cost is high due to low efficiency and low current density.
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02
Polyelectrolyte (PEM) water electrolysis
Although the maintenance period is short due to the high material cost and the short lifespan of the cation exchange membrane, the current density is high due to the high energy efficiency and the possibility of material corrosion is small.
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03
Anion exchange membrane (AEM) water electrolysis
No noble metal catalyst is used and a non-noble metal-based catalyst such as nickel is used. In addition, it has the advantage of being able to replace the material of the separation plate, titanium, with cheap steel material.
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04
Solid oxide (SOEC) water electrolysis
Because pure water is used as a raw material without using an electrolyte, the purity of the hydrogen produced is very high, and it is expected to become a key technology in the future water electrolysis hydrogen production field.
