“…The power density can be calculated by Ohm’s law, which is 57 nW/cm 2 . The values are comparable to other piezoelectric nanogenerators made of lead zirconate titanate (PZT), zinc oxide (ZnO), and polyvinylidene difluoride (PVDF)-based piezoelectric materials [ 31 , 32 , 33 , 34 , 35 , 36 , 37 ], and this power density can be used for powering various types of low energy consumption sensors such as temperature sensors, electrochemical sensors, biosignals sensors, and other mechanical sensors [ 38 , 39 , 40 , 41 , 42 ]. Under 100% strain stretching, the voltage and current output slightly increased to around 0.38 V and 0.23 μA/cm 2 at the same conditions of 60 N 5 Hz, respectively ( Figures S4 and S5 in the Supplementary Materials ).…”