Engineers create an energy-storing supercapacitor from ancient materials

https://techxplore.com/news/2023-07-energy-storing-supercapacitor-ancient-materials.html

"water, cement and highly conductive carbon black... low cost... concrete house foundation store full day energy adding little or no cost still providing structural strength... concrete roadway contactless charging... make wire-like structures extremely large surface area within relatively small volume... potassium chloride electrolyte soaked... 45 m^3 store 10 kW-hours, enough for household... for foundation, sweet spot 10% carbon black"

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