Wearable sensing flexible single-electrode triboelectric nanogenerator based on Perilla straw biomass

The reuse of waste biomass resources has garnered significant attention in sustainable energy research. The selection of green, natural, and pollution-free biomass materials for preparing triboelectric nanogenerators (TENGs) is a hot research topic. In this work, a low-cost and easy-to-process single-electrode TENG was constructed with Perilla straw and methylcellulose. Under an external force of 40   N and a contact separation frequency of 0.8   Hz, the maximum open circuit voltage and current are 5.7   V and 199.6   nA, and the charge is 1.86 nC. When the resistance is 150 MΩ, the output power reaches a maximum value of 2160 nW. With the flick of the hand, it can be used for circuit lighting and can light up 80 LED lights. Selecting a single-electrode mode for TENG has advantages in human body sensing. After the movements of the wrist, finger and arm joint, the oscilloscope can clearly identify the motion signals. This flexible TENG is capable of collecting the mechanical energy generated during body movement to achieve self-powering and human sensing, providing new ideas for the high value-added utilization of waste biomass straw.