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‘Solar battery’ stores sunlight for days, then releases hydrogen on demand

'Solar battery' stores sunlight for days, then releases hydrogen on demand
Catalyst solutions with luminescent ruthenium dye, which are irradiated with visible light in the reactor. Credit: Elvira Eberhardt, Ulm University

A new material can store energy from sunlight and convert it into hydrogen days later. The material, jointly developed by researchers from Ulm and Jena, can do this even in the dark. The process is reversible and can be reactivated several times using a pH switch. The results are published in the journal Nature Communications.

Green hydrogen is one of the most important pillars of the energy transition. It is produced from sunlight using photocatalytic processes. There are now a variety of technologies for converting and storing solar energy into chemical energy...

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