Figure 8.

In vivo energy harvesting by PENGs and TENGs. A) The first demonstration of in vivo biomechanical‐energy harvesting using a single nanowire based PENG. Reproduced with permission.76 B) Conformal energy harvesting from heart/lung by PZT based PENG. Reproduced with permission.31 Copyright 2014, National Academy of Sciences. C) Flexible PVDF based PENG for harvesting energy from ascending aorta. Reproduced with permission.78 Copyright 2015, Elsevier. D) The first demonstration of implantable TENG for harvesting biomechanical energy.[[qv: 68b]] E) Wireless cardiac monitoring system powered by iTENG.82