Supercapacitor cement is key to buildings that store their own power

Scientists from Harbin Institute of Technology and the Chinese Academy of Sciences have developed an experimental cement-based supercapacitor that combines carbon nanotubes, carbon black, and cement in a 3D-printed pattern; the material has compressive strength comparable to conventional concrete while storing energy electrostatically for rapid bursts of power.

This is laboratory research. The technology has not yet been tested in real building applications.