Fig. 6: Application of the CPENG.

a Schematic of an electrical circuit for energy storing to a capacitor. b Mechanical energy is converted to electrical energy by the CPENG to charge different capacitors. c The CPENG is charging an LTC 3588-2 system on a chip (SoC). d Comparison of normalized current density with CPENG and other representative PENGs. Source data are provided as a Source Data file.