Fig. 4: TENG films based on abraded van der Waals powders.
From: Heterostructures formed through abraded van der Waals materials
a Schematic showing the evolution of charge within the device during a charging/discharging cycle. b Current response through a 1 MΩ resistor for an abraded graphite TENG electrode (black) compared with an abraded graphite–MoS2 TENG heterostructure electrode (red). (Inset: PTFE hammer connected to a linear actuator used to generate the voltage pulses). c Top: temporal response of the open circuit voltage and bottom: temporal response of the short circuit current, for the graphite–TMDC TENG electrode. d Voltage accumulation on a capacitor vs time (hammer frequency ~ 3 Hz). Inset top: rectifying circuit used to charge the capacitor. Inset middle left: three glowing LED’s during discharge of the capacitor. Inset right: zoomed in region of the charging curve highlighting the energy stored on the capacitor per cycle.
