Nanogenerator for Harvesting Energy from Reciprocating Sliding Motion

arnessing ambient mechanical en-ergy is attracting a lot of attention due to the fast development of portable electronics and sensor networks.1,2 Mechanisms using piezoelectric,36 electro-static7,8 or electromagnetic9,10 principles to harvest energy from random vibrations,11 wind flow,12 air pressure,13 or human body motions14 have been developed and applied as generators or self-powered sensors.13,15 Recently, the development of triboelectric nanogenerators (TENGs) offers a new paradigm for fabricating high-output and cost-effective generators for driving small electronics.1619 Reciprocating mo