top of page

Alkaline electrolyser


Technology Description

Electrolysis uses electricity to split water into its basic components (H2 and O2). Alkaline electrolysers are a type of electrolyser that uses nickel-based electrodes and a concentrated alkaline solution (25-35 wt% KOH) to enable the splitting of water. Alkaline electrolysers have been applied on 10+ MW scale for over hundred years, where they were traditionally used to produce hydrogen for ammonia plants based on hydropower until gas reforming became the cheapest technology. These electrolysers were traditionally operated in a baseload manner. Both atmospheric and pressurized versions (15-30 bara) do exist. The electrolysis products from anodes via water splitting may not only be O2. For example, the product is Cl2 from the chlor-alkali process, which is today the largest market for alkaline electrolysers. The selectivity of the products is dependent on the electrolytes and catalysts.

Relevance for Net Zero

Alkaline electrolysers are well developed and present lower cost reduction potential than other electrolysis technologies, but are currently the most mature and least costly technology. Current technologies are less flexible. They will likely lead initial deployment of electrolytic hydrogen at scale.

Key Countries

China, Denmark, Germany, France, Norway

WhatsApp Image 2024-02-06 at 3.17.05 PM.jpeg
Share your challenge to quickly find solutions
Have a solution for
this technology?

List your innovation on the InCarbZero platform and increase your visibility to industry partners.

bottom of page