Korea Advanced Institute of Science and Technology (KAIST) researchers have discovered how to radically improve conversion of ambient energy (such as body movement) to electrical energy for powering wearable and portable devices.
As has been noted on KurzweilAI, energy-harvesting devices can convert ambient mechanical energy sources — including body movement, sound, and other forms of vibration — into electricity.
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Ref: Characteristics of piezoelectric ZnO/AlN−stacked flexible nanogenerators for energy harvesting applications. Appl. Phys. Lett. 106, 023901 (2015); http://dx.doi.org/10.1063/1.4904270
200x power increase in nanogenerators could enable powering of many devices simply from movement
