HybridStock – Hybrider saisonaler Speicher für erneuerbare Wärme und Strom auf der Basis ei-nes Aluminium-Redox-Zyklus

• Research unit: SFOE
• Project number: SI/501693

Publications / Results (German)

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Publications / Results (French)

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Final report (German)

Aluminium can be used as an energy vector that can be stored as long as desired and from which very
high amounts of energy can be released. The production of heat and hydrogen was investigated and a
400 W prototype reactor was built that produced roughly 4.3 kWh of heat and 0.11 kg hydrogen per kg
Al from an Al-water reaction. The purity of the produced hydrogen was very high, such that it can be
used directly in a PEM fuel cell for the production of electricity. Simulations showed that 300 – 500 kg
Al per dwelling would be needed for buildings that are built according to current standards in order to
store solar energy from summer to winter and to fully cover the electricity and heat demand over the
whole year in combination with a PV and heat pump system. A life cycle analysis showed that the overall
global warming potential of this new 100% solar building energy supply concept is substantially lower
than for a conventional system. Remaining emissions can be reduced substantially when an inert
electrode process is used for Al smelting instead of the conventional Hall-Héroult process, and when
electricity is provided by hydro or wind power instead of photovoltaics.

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• Final Report [PDF] 11'703 kB