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Research Article

Ultra-robust triboelectric nanogenerator for harvesting rotary mechanical energy

Xinyu Du1,§, Nianwu Li1,§, Yuebo Liu2, Jiaona Wang2, Zuqing Yuan1,4, Yingying Yin1,4, Ran Cao1,4, Shuyu Zhao2, Bin Wang2, Zhong Lin Wang1,3,4, Congju Li1()
Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesNational Center for Nanoscience and Technology (NCNST)Beijing100083China
School of Materials Science & EngineeringBeijing Institute of Fashion TechnologyBeijing100029China
School of Material Science and EngineeringGeorgia Institute of TechnologyAtlanta, Georgia30332-0245USA
University of Chinese Academy of SciencesBeijing100049China

§ Xinyu Du and Nianwu Li contributed equally to this work.

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Abstract

Triboelectric nanogenerators (TENGs) for harvesting rotary mechanical energy are mostly based on in-plane sliding or free-standing mode. However, the relative displacement between two contacting triboelectric layers causes abrasion, which lowers the output power and reduces service life. Therefore, it is important to develop a method to minimize abrasion when harvesting rotary mechanical energy. Here, we report a scale-like structured TENG (SL-TENG), in which two triboelectric layers work under a contact-separation mode to avoid in-plane relative sliding in order to minimize abrasion. As a result, the SL-TENG exhibits outstanding robustness. For example, the output voltage of the SL-TENG does not exhibit any measurable decay although this output has been continuously generated through more than a million cycles. Moreover, at a very low rotation rate of 120 rpm, the SL-TENG can generate a maximum short-circuit current of 78 μA, delivering an instantaneous power density of 2.54 W/m2 to an external load. In relation to this, a Li-ion battery was charged using the SL-TENG. After a 30-min charging time, the battery achieved a discharge capacity of 0.1 mAh. Through a power management circuit integrated into the SL-TENG, a continuous direct current (DC) of 5 V is outputted, providing sufficient DC power for driving a radio-frequency wireless sensor and other conventional electronics.

Keywords

nanogeneratorultra-robustenergy harvestingrotary motionsscale-like structure

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Nano Research
Volume 11 Issue 5,
May 2018
Pages 2862-2871
DOI: 10.1007/s12274-017-1916-5
Cite this article:
Du X, Li N, Liu Y, et al. Ultra-robust triboelectric nanogenerator for harvesting rotary mechanical energy. Nano Research, 2018, 11(5): 2862-2871. https://doi.org/10.1007/s12274-017-1916-5
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