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A small size decentralized electrolyzer for high pressure hydrogen production

April 2019
Gallery HyRiS 1
Gallery HyRiS 1


HyRiS system is a zero-carbon, silent H2 generator producing high purity hydrogen, directly at high pressure without any compressor for decentralized refueling applications (stationary and mobility).

The small sized decentralized electrolyzer uses a redox mediator to decouple the water electrolysis reaction into 2 steps: (i) the 1st step which consumes electricity and releases oxygen gas at the anode; (ii) The 2nd step which generates hydrogen without energy consumption. At the end of the second step, the redox mediator is totally regenerated, and a new two-steps cycle can start again. Water is the only product that is refilled at each cycle. HyRiS possesses numerous advantages: the direct hydrogen production at high pressure due to a high equilibrium pressure and a simplified design thanks to separated O2 and H2 production eliminates the need for an external hydrogen compressor. HyRiS is able to store energy at the low power loads that are characteristic of renewable power sources, and then is able to provide hydrogen at a high reaction rate when needed. It integrates a chemical storage function (for e.g., it is possible to store electricity from a PV source and to produce hydrogen at night). Higher hydrogen purity compared to conventional systems, thanks to high pressure and batch operation, requiring no specific purification system for most applications.

Label Date April 11, 2019
Parent company Air Liquide
From France
Maturity stage Prototype testing in the real world
Looking For Promotion, new international partners and investors, stakeholders

The environmental benefits

  • Decouples energy consumption and hydrogen production.
  • Higher purity hydrogen.
  • No CO2 emissions during operation.

The Financial benefits

  • Industry costs of around 5 000 EUR per year which is 40% less and 30% less compared to B50 delivery and alkaline solution respectively.

Activity Region

  • /
  • Headquarters
  • Activity

Company Profile


ERGOSUP develops and manufactures, green, silent, high pressure H2 generators for decentralized refueling applications

View company profile
Headquarters 26780 Châteauneuf-du-Rhône, France

Parent company

Air Liquide

A world leader in gases, technologies and services for Industry and Health.

View company profile
Headquarters 75007 Paris, France

Related Topics

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The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances. The innovator ERGOSUP has asserted ownership of the intellectual property rights for images, videos, and content showcased above, affirming full and unrestricted usage rights, and has provided explicit permission for the Solar Impulse Foundation to publish such information designated as "public" in the application form.