An Omnidirectionally Stretchable Piezoelectric Nanogenerator Based on Hybrid Nanofibers and Carbon Electrodes for Multimodal Straining and Human Kinematics Energy Harvesting

摘要: Stretchable piezoelectric nanogenerators (SPENGs) for human kinematics energy harvesting have limited use due to the low stretchability or mechanical robustness and difficulty of structural design omnidirectional stretchability. This study reports an efficient, omnidirectionally stretchable, robust SPENG based on a stretchable graphite electrode 3D micropatterned substrate stacked mat nanofibers. The free-standing nanofibers is alternatively composed nanocomposite barium titanate nanoparticles embedded in polyurethane poly(vinylidene fluoride-trifluoroethylene) nanofiber (nf-SPENG) exhibits high 40% durability up 9000 stretching cycles at 30% strain, which are attributed stress-relieving nature micropattern hybrid nf-SPENG produces peak open circuit voltage (Voc) short current (Isc) 9.3 V 189 nA, respectively. demonstrated harvest from while walking when placed over knee cap subject, generating maximum Voc 10.1 V. stretchability, efficiency, facile fabrication process, durability, environmentally friendly lead-free components, response multimodal straining make this device suitable self-powered wearable sensing systems.