Chemical storage of hydrogen in salt Efficient, safe and scalable

Energy In Salt

AKROS Energy develops innovative, non‑hazardous chemical hydrogen storage solutions that make hydrogen easy to transport, store, and deploy at industrial scale. Backed by H2APEX and supported by EU funding, our patented technology delivers safe, cost-efficient storage for the global energy transition.

Zero Hazard Materials

Exceptional Cost Efficiency

Climate Friendly

Made From Naturally Abundant Materials

Technology

The breakthrough lies in hydrogen storage using salt solutions – a simple yet revolutionary approach to storing hydrogen. This method relies on non-toxic materials and ensures a very high level of safety, redefining the standards for energy storage and transport.

We convert hydrogen gas into a hydrogen rich solution. The reversible process relies on potassium bicarbonate (salt-) and potassium formate (salt+) – two safe and readily available compounds. The simplicity of our approach is the key for its affordability and safety.

KHCO3 + H2 ⇌ KHCO2 + H2O

Bicarbonate-Formate Cycle for Hydrogen Storage

Applications

Long-Duration Hydrogen Storage

Ideal for industrial operations – including steel production, refineries, and chemical processes – by providing reliable backup supply and facilitating renewable energy balancing.

Hydrogen Transportation

Hydrogen-loaded salt can be transported using existing bulk carrier or food grade tanker infrastructure, enabling cost-efficient logistics and affordable terminal solutions with the lowest overall shipping costs.

H2 and CO2 Buffer

AKROS salt-based storage technology serves as an efficient intermediary in Power-to-X processes, supporting a normalized hydrogen and carbon dioxide feedstock management.

How It Works

Hydrogen gas is introduced into a fixed-bed reactor at below 30 bar together with the bicarbonate solution (Salt-). Through a heterogeneous catalytic reaction, the hydrogen is chemically bound in the solution, forming formate (Salt+). The formate can then be stored or transported as a solution or crystallized salt. To release the hydrogen, the formate solution is fed back into the same reactor at 60 °C, where it is converted again into bicarbonate.