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+## Data from: Transcutaneous ultrasound energy harvesting using capacitive triboelectric technology
+### Creators
+Hinchet, Ronan
+Yoon, Hong-Joon
+Ryu, Hanjun
+Kim, Moo-Kang
+Choi, Eue-Keun
+Kim, Dong-Sun
+Kim, Sang-Woo
+
+### Description
+A major challenge for implantable medical systems is the inclusion or reliable delivery of electrical power. We use ultrasound to deliver mechanical energy through skin and liquids, and demonstrate a thin implantable vibrating triboelectric generator able to effectively harvest it. The ultrasound can induce the micrometer scale displacement of a polymer thin membrane to generate electrical energy through contact electrification. We recharge a Li-ion battery at a rate of 166 μC/s in water. The voltage and current generated ex-vivo by ultrasound-energy transfer reached 2.4 V and 156 µA under porcine tissue. It shows that capacitive triboelectric electret is the first technology able to compete with piezoelectricity to harvest ultrasound in-vivo and power medical implants.
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