Finger typing driven triboelectric nanogenerator and its use for instantaneously lighting up LEDs

► A novel and simple arch-shaped triboelectric nanogenerator is invented that can efficiently used for harvesting irregular mechanical energy. ► Instantaneous output power of single device can reach as high as ∼4.125 mW which is enough to instantaneously drive 50 commercial blue LEDs connected in series. ► By conjunction with a transformer, the device can power the wireless infrared sensor system.