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?