Winner of the Latvian Startup Awards 2025 in the Impact Category! We are proud to announce that ProtiumTech
Highly efficient decoupled water electrolysis systems for on-demand hydrogen production
DECOUPLED WATER ELECTROLYSIS SYSTEMS
Separating gases by time and space, eliminating costly & fragile membranes
Separates H₂ and O₂ production through REDOX-mediated charge and discharge cycles
Scale by adding electrode modules from kW to MW systems
Integrated electrode assemblies with reduced component count per cell from 132 to 10
Simple architecture without high-temperature processes
WE STAND OUT
80% ENERGY ARBITRAGE
38 kWh/kg H₂ shifted to low-cost electricity periods
UNLIMITED ON/OFF
Without active component degradation
BUILT-IN FLEXIBILITY
Charge REDOX when energy is cheap, generate H₂ with high efficiency
REDUCED CAPEX REQUIREMENTS
Lower hydrogen storage and balance-of-plant requirements
TECHNOLOGY
Water electrolysis consists of two half-reactions, one being the oxygen evolution reaction (OER) and the other being the hydrogen evolution reaction (HER). In a decoupled electrolyser the evolution of oxygen and hydrogen gases are separated temporary or spatially. Decoupled electrolysis cell consists of the cell body, which is filled with electrolyte, in which the working electrode and the auxiliary electrode are immersed. In OER step the power supply is connected with the negative terminal to the auxiliary electrode and the positive terminal to the working electrode. At a certain potential, the oxygen evolution reaction starts on the OER/HER electrode and intercalation takes place on the auxiliary electrode, relasing O₂ gas in the cell. In HER step the polarity of the power source is reversed and at a certain potential, hydrogen evolution reaction takes place on the working electrode and deintercalation reaction on the auxiliary electrode, releasing H2 gas in the cell.
The process is cyclic, where in the first cycle, oxygen is produced on the working electrode and the auxiliary electrode of the red-ox mediator is reduced, and in the second cycle, hydrogen is released on the working electrode and the auxiliary electrode is oxidized.
TWO-STEP ELECTROLYSIS
Water splitting and hydrogen storage
Releasing hydrogen
SIMPLIFIED ARCHITECTURE
Electrolyzer stack is based on a modular architecture consisting of 10 electrode boxes connected electrically in series. Each box contains five REDOX electrode assemblies and six catalyst electrodes arranged within a compact structure.
REDOX electrode assemblies were redesigned to reduce complexity, manufacturing costs and optimize design footprint while maintaining the same power output. The final design was reduced to only 10 components with a compact titanium-based construction, improving manufacturability.
Each electrode box is enclosed within a sealed polymer-based housing designed to ensure reliable operation and minimize leakage risks.
The electrolyte reservoir is divided into three sections: the outer compartments manage hydrogen and oxygen handling, while the central compartment enables vacuum purging between operational cycles, ensuring removal of residual gases and improving operational safety and process stability.
The gas management system is based on a simplified and compact architecture designed for efficient hydrogen handling, purification, and operational safety. The system integrates cooling, filtration, deoxidizing, drying, and gas flow control within a streamlined layout, reducing auxiliary components, overall system complexity, and manufacturing costs.
The operational sequence is controlled through an automated valve system that manages gas flow and cycle transitions. Hydrogen passes through a dedicated purification process consisting of cooling, coalescing filtration, deoxidizing catalyst beds, and TSA drying units, enabling hydrogen purity of 99.999%.
The compact design improves system integration, simplifies maintenance, lowers infrastructure costs, and supports reliable operation for scalable hydrogen production systems.
NEWS
ProtiumTech Selected for Fundación Repsol’s Fondo de Emprendedores Program securing 120k convertible loan! ProtiumTech is proud to announce
ProtiumTech Completes Plug and Play Batch #3 and Secures Investment! On April 10th, ProtiumTech participated in the Plug
ProtiumTech clinched 4 awards at TechChill 2025! On February 7, 2025, ProtiumTech celebrated a major milestone at TechChill
ProtiumTech’s Latest Breakthrough: Improved Efficiency and Hydrogen Production Volume ProtiumTech is proud to introduce a groundbreaking advancement in
ABOUT US
ProtiumTech is a Latvian deeptech and cleantech startup established in 2023, focused on developing membrane-free decoupled water electrolysis systems for efficient and on-demand green hydrogen production. We’re combining advanced electrochemistry, materials science, and engineering to address one of the key challenges in the hydrogen economy – reducing the cost and improving the operational flexibility of green hydrogen production.
By integrating smart energy management with compact design, we’re building hydrogen production systems optimized for renewable energy integration, industrial decarbonisation, and future hydrogen infrastructure applications.
TEAM
Let’s talk hydrogen!
INVESTORS
