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Press Release 024/2019

Storing Energy with Eggshells

For the First Time, a Research Group Successfully Uses Eggshells as Electrode for Energy Storage
2019_024_Mit Eierschalen Energie speichern_72 dpi
Eggshells consist of porous calcium carbonate that is highly suited for use in electrochemical storage systems. (Photo: Manuel Balzer, KIT)

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. (DOI: 10.1039/c8dt03252a)

 

Chicken eggs are used worldwide in large quantities in the food, pharmaceutical, and manufacturing industries. After using the eggs, however, the shells are discarded and disposed of as biowaste on landfills. The shell consists of a composite of calcium carbonate (CaCO3) and a protein-rich fiber membrane. “Surprisingly, there are constantly new examples in which natural substances are found to be suited well or even very well for producing materials for electrochemical storage systems,” says Professor Maximilian Fichtner of the Helmholtz Institute Ulm, an institution founded by KIT.

 

Forschende charakterisieren die Morphologie des Eierschalenmaterials mithilfe eines Rasterelektronenmikroskops. (Foto: Daniel Messling, HIU/KIT)
Researchers characterize the morphology of the eggshell material with the help of a scanning electron microscope. (Photo: Daniel Messling, HIU/KIT)

 

Together with Australian colleagues, Fichtner discovered the promising electrochemical properties of chicken eggshells, which are able to store lithium thanks to their large proportion of CaCO3. Fine eggshell powder was used as an electrode against a metallic lithium anode in a non-aqueous electrolyte. The test cell was found to maintain an excellent capacity retention of 92% over more than 1000 charge and discharge cycles. Both the calcified shell and the inner and outer shell membranes were used. The researchers washed, dried, and crushed the sells to a powder and obtained a conductive material.

 

So far, eggshell waste has been used in a number of applications, including bioceramics, cosmetics, or dye industry. The protein-rich, fibrous eggshell membrane was applied as a separator in supercapacitors. But for the first time worldwide, biowaste has now been used as an electrode. Now, further research and detailed understanding of the electrochemical and physical behavior of the material are needed to improve its performance and enable widespread use, the researchers say.

 

Original publication:

Minakshi, M.; Visbal, H.; Mitchell, D. R. G.; Fichtner, M.: Bio-waste chicken eggshells to store energy. 2018. Dalton transactions, 2018 (47), 16828–16834. DOI:10.1039/c8dt03252a.

https://pubs.rsc.org/en/Content/ArticleLanding/2018/DT/C8DT03252A#!divAbstract

 

 

More about the KIT Energy Center: http://www.energy.kit.edu

 

Being „The Research University in the Helmholtz Association“, KIT creates and imparts knowledge for the society and the environment. It is the objective to make significant contributions to the global challenges in the fields of energy, mobility and information. For this, about 9,300 employees cooperate in a broad range of disciplines in natural sciences, engineering sciences, economics, and the humanities and social sciences. KIT prepares its 25,100 students for responsible tasks in society, industry, and science by offering research-based study programs. Innovation efforts at KIT build a bridge between important scientific findings and their application for the benefit of society, economic prosperity, and the preservation of our natural basis of life.

dm, 18.02.2019

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The press release is available as a PDF file.