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    An Amphiphobic Hydraulic Triboelectric Nanogenerator for a Self-Cleaning and Self-Charging Power System

    Year: 2018

    Journal: Adv. Funct. Mater., Volume 28, AUG 29

    Authors: Zhang, Qian; Liang, Qijie; Liao, Qingliang; Ma, Mingyuan; Gao, Fangfang; Zhao, Xuan; Song, Yiding; Song, Lijuan; Xun, Xiaochen; Zhang, Yue

    Organizations: National Key Research and Development Program of China [2016YFA0202701]; Overseas Expertise Introduction Projects for Discipline Innovation (111 project); National Natural Science Foundation of China [51722203, 51672026, 51527802]; Beijing Municipal Science & Technology Commission [Z161100002116027]; State Key Laboratory for Advanced Metals and Materials; Fundamental Research Funds for Central Universities [FRF-TP-18-001C1]

    Keywords: power systems; self-charging devices; self-cleaning devices; water energy; wearable power sources

    Raindrop falling, which is one kind of water motions, contains large amount of mechanical energy. However, harvesting energy from the falling raindrop to drive electronics continuously is not commonly investigated. Therefore, a self-cleaning/charging power system (SPS) is reported, which can be exploited to convert and store energy from falling raindrop directly for providing a stable and durable output. The SPS consists of a hydraulic triboelectric nanogenerator (H-TENG) and several embedded fiber supercapacitors. The surface of H-TENG is amphiphobic, enabling the SPS self-cleaning. The fiber supercapacitor which uses alpha-Fe2O3/reduced graphene oxide composite possesses remarkable specific capacitance, excellent electrical stability, and high flexibility. These properties of the fiber supercapacitor make it suitable for a wearable power system. A power raincoat based on the SPS is demonstrated as application. After showering by water flow, which simulates falling raindrops, for 100 s, the power raincoat achieves an open-circuit voltage of 4 V and lights a light-emitting diode for more than 300 s. With features of low cost, easy installation, and good flexibility, the SPS harvesting energy from the falling raindrop renders as a promising sustainable power source for wearable and portable electronics.
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