Efficient, stationary hydrogen and energy storage systems
The storage of large amounts of energy on a TWh scale is a central problem for the future, increasingly renewable, energy supply. In the future, stationary power-to-power storage systems should be able to stabilize distribution networks and absorb periods of low power generation. One possibility for storing large amounts of energy is the electrochemical generation of hydrogen when there is an excess of energy and its reuse in line with demand in times of increased energy demand.
Liquid Organic Hydrogen Carriers (LOHC) can store very large quantities of hydrogen in the form of a liquid under ambient conditions. Classic LOHC systems have been developed primarily for hydrogen transport. Through consistent further development of catalyst and reactor technology, however, efficient, stationary storage solutions are now also conceivable.
The provision of the reaction heat for hydrogen release is decisive for the efficiency of any LOHC process. If electricity generation using hydrogen and heat generation can be profitably combined for the process, overall efficiencies of more than 40% are possible for such a storage process.