With this triboelectric nanogenerator and two-stage power management and storage system, finger tapping motion generates enough power to operate this scientific calculator. Credit: Credit: Zhong Lin Wang Laboratory
These generators harvest energy from irregular human motion such as walking, running or finger tapping. The system uses a small capacitor to capture alternating current generated by the biomechanical activity. When the first capacitor fills, a power management circuit then feeds the electricity into a battery or larger capacitor. This 2nd storage device supplies DC current at voltages appropriate for powering wearable and mobile devices such as watches, heart monitors, calculators, thermometers – and even wireless remote entry devices for vehicles.
By matching the impedance of t...
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