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High-efficiency piezoelectric micro harvester for collecting low-frequency mechanical energy
Li, Xin1; Song, Jinhui2; Feng, Shuanglong1; Xie, Xiong1; Li, Zhenhu1; Wang, Liang1; Pu, Yayun1; Soh, Ai Kah3; Shen, Jun4; Lu, Wenqiang1
2016-12-02
摘要A single-layer zinc oxide (ZnO) nanorod array-based micro energy harvester was designed and integrated with a piezoelectric metacapacitor. The device presents outstanding low-frequency (1-10 Hz) mechanical energy harvesting capabilities. When compared with conventional pristine ZnO nanostructured piezoelectric harvesters or generators, both open-circuit potential and shortcircuit current are significantly enhanced (up to 3.1 V and 124 nA cm(-2)) for a single mechanical knock (similar to 34 kPa). Higher electromechanical conversion efficiency (1.3 pC/Pa) is also observed. The results indicate that the integration of the piezoelectric metacapacitor is a crucial factor for improving the low-frequency energy harvesting performance. A double piezoelectric-driven mechanism is proposed to explain current higher output power, in which the metacapacitor plays the multiple roles of charge pumping, storing and transferring. An as-fabricated prototype device for lighting an LED demonstrates high power transference capability, with over 95% transference efficiency to the external load.
关键词piezoelectric-driven harvester ZnO nanorods metacapacitor low-frequency mechanical energy harvest wearable electronics
DOI10.1088/0957-4484/27/48/485402
发表期刊NANOTECHNOLOGY
ISSN0957-4484
卷号27期号:48页码:9
通讯作者Lu, WQ (reprint author), Chinese Acad Sci, Chongqing Key Lab Multiscale Mfg Technol, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China.
收录类别SCI
WOS记录号WOS:000388006900001
语种英语