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Recent development of Internet of Things and related sensor technologies have greatly impacted on the logistics tracking, structural health monitoring, environment analysis, and data extraction. It is highly imperative to develop a technology to allow the sensor node to operate independently, sustainably, and maintenance-free by harvesting the energy from the ambient environment. Here we demonstrate a triboelectric device as a high-efficient and durable kinetic energy harvester from ubiquitously mechanical vibration. We construct a cylinder coated with polytetrafluoroethylene (PTFE), and place a number of metal balls inside the cylinder. This ball-based triboelectric generator (B-TEG) coverts the mechanical shaking into the electricity. By grounding the metal-freestanding-layer, the output power shows 16 times improvement through the electrophorus effect. This triboelectric nanogenerator can charge a 100 μF capacitor within 100 second, providing potential for supplying sustainable power to wireless sensor nodes.
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