HyCS®-Technology: simple and effective

Reduction and Oxidation

At its core, HyCS® technology consists of the reduction and oxidation of iron (Fe): When loading the storage, the Fe is reduced by the supplied H₂. Steam is released and can be used again in electrolysis. During discharge, steam is fed at the point of use, which can also come from the exhaust gas of a regeneration unit. This oxidizes the Fe and H₂ is provided.

Highest storage density

The HyCS® process principle offers numerous advantages compared to conventional H₂ storage. The graph shows: More than 2 kWh of hydrogen can be stored in one litre of HyCS® storage. This is about 2.5 to 5 times as much as in a pressure vessel (700/350 bar). And twice as much as can be stored with liquid hydrogen, in metal hydrides or similar approaches (LOHC). This makes the HyCS® storage system the most compact of all energy storage systems – of course also significantly more compact than Li-ion batteries (factor 10).

Best efficiency

Smart integration, especially with steam driven electrolysis (SOEC) and SOFC fuel cells, results in long-term power storage efficiencies of up to 100% higher than with alternative systems. HyCS® technology thus reduces H₂ generation and storage costs.

Reduced transport costs

HyCS® technology means:
• Halving the space requirement for H₂ storage
• 2 x as much H₂/truck as in bundles of bottles
• Reduction of H₂ generation and storage costs


For larger storage systems, HyCS® already offers cost advantages. Due to the currently high costs of the reversible SOFC, HyCS® storage units are currently more expensive than electric batteries with a storage capacity of <1 MWhel. Currently, HyCS® storage systems are competitive by the help of investment subsidies, in the medium term they will be by raising cost-cutting potentials.

Sounds interesting?