Biowaste in the form of chicken eggshells has proved to be very effective for energy storage. This finding was made by an international team of researchers, including scientists of the Helmholtz Institute Ulm (HIU) established by Karlsruhe Institute of Technology (KIT). In the journal Dalton Transactions of the Royal Society of Chemistry, they present the sustainable storage material that might be used in a low-cost lithium-ion capacitor.