title: High output piezo/triboelectric hybrid generator.
abstract: Recently, piezoelectric and triboelectric energy harvesting devices have been developed to convert mechanical energy into electrical energy. Especially, it is well known that triboelectric nanogenerators have a simple structure and a high output voltage. However, whereas nanostructures improve the output of triboelectric generators, its fabrication process is still complicated and unfavorable in term of the large scale and long-time durability of the device. Here, we demonstrate a hybrid generator which does not use nanostructure but generates much higher output power by a small mechanical force and integrates piezoelectric generator into triboelectric generator, derived from the simultaneous use of piezoelectric and triboelectric mechanisms in one press-and-release cycle. This hybrid generator combines high piezoelectric output current and triboelectric output voltage, which produces peak output voltage of ~370 V, current density of ~12 μA · cm(-2), and average power density of ~4.44 mW · cm(-2). The output power successfully lit up 600 LED bulbs by the application of a 0.2 N mechanical force and it charged a 10 μF capacitor to 10 V in 25 s. Beyond energy harvesting, this work will provide new opportunities for developing a small, built-in power source in self-powered electronics such as mobile electronics.
authors: Electronic Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea.
authors: Woo-Suk
authors: WS
authors: Jung
authors: Electronic Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea.
authors: Min-Gyu
authors: MG
authors: Kang
authors: Electronic Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea.
authors: Hi Gyu
authors: HG
authors: Moon
authors: 1] Electronic Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea [2] Department of Nanomaterials Science and Technology, University of Science and Technology (UST), Daejeon, 305-333, Korea.
authors: Seung-Hyub
authors: SH
authors: Baek
authors: Electronic Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea.
authors: Seok-Jin
authors: SJ
authors: Yoon
authors: School of Material Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States.
authors: Zhong-Lin
authors: ZL
authors: Wang
authors: School of Advanced Materials Science and Engineering, SKKU Advanced Institute of Nanotechnology (SAINT), Center for Human Interface Nanotechnology (HINT), Sungkyunkwan University, Suwon 440-746, Korea.
authors: Sang-Woo
authors: SW
authors: Kim
authors: 1] Electronic Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea [2] KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 136-701, Korea.
authors: Chong-Yun
authors: CY
authors: Kang