Quantum mechanics

Power density

Pulsed power

Voltage

Engineering

Capacitance

Materials science

Ceramic

Power (physics)

Energy harvesting

Capacitor

Supercapacitor

Thermodynamics

Laser

Physics

Nanotechnology

Optics

Energy storage

Composite material

Decoupling capacitor

Electrode

Piezoelectricity

Optoelectronics

Ultrashort pulse

Ceramic capacitor

Electrical engineering

Engineering physics

ACS Energy Letters

Flexible self-charging capacitor systems, which exhibit the combined functions of energy generation and storage, are considered a promising solution for powering flexible self-powered electronics. Here, we present a new approach to demonstrate a flexible self-charging, ultrafast, and high-power-density (SUHP) capacitor system by integrating an aerosol-deposited nanograined relaxor ferroelectric Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN–PT) capacitor and piezoelectric Pb(Zrx,Ti1–x)O3 (PZT) harvester. The as-designed flexible SUHP capacitor system can generate electric energy with an open-circuit voltage of 172 V and a short-circuit current of 21 μA under a biomechanical bending force of human fingers. This energy can be stored in the integrated flexible capacitor part and then discharged with a high energy density of 2.58 J/cm3 within an ultrafast time of 480 ns. Moreover, a high power density of 5.38 MW/cm3 from the flexible SUHP capacitor suggests that the proposed approach for self-charging and energy storage may be an efficacious way to drive future flexible pulsed-power electronic devices.

Flexible Self-Charging, Ultrafast, High-Power-Density Ceramic Capacitor System