fig9

Figure 9. Piezoelectric composites in energy harvesters. (A) Schematic illustration showing the structure of the W-PUEH device based on natural wood with lattice-like cellulose channels^[89]. Copyright 2021, Royal Society of Chemistry; (B) the PZT NPs are surface-functionalized with amine groups.^[83] Copyright 2018, Royal Society of Chemistry; (C) the generated output voltage (open-circuit voltage) from the PNG device attached to the elbow and wrist when subjected to bending^[83]. Copyright 2018, Royal Society of Chemistry.