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	I. Selfcharging Supercapacitor
Piezoelectric-Driven Self-Charging Supercapacitor Power Cell
       Ananthakumar Ramadoss,,z Balasubramaniam Saravanakumar,z Seung Woo Lee,§ Young-Soo Kim,)Sang Jae Kim,*,†,‡,)and Zhong Lin Wang),^
						Nanomaterials and System Lab, †Faculty of Applied Energy System, Science and Engineering College, and ‡Department of Mechatronics Engineering, Engineering
						College, Jeju National University, Jeju City, Jeju 690-756, Republic of Korea, §Woodruff School of Mechanical Engineering and)School of Materials Science and
						Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States, and ^Beijing Institute of Nanoenergy and Nanosystems,
						Chinese Academy of Sciences, Beijing, China. zThese authors contributed equally.
						
Published online 10.1021/acsnano.5b00759

In this work, we have fabricated a piezoelectricdriven self-charging supercapacitor power cell (SCSPC) using MnO2 nanowires as positive and negative electrodes and a polyvinylidene difluoride (PVDF)ZnO film as a separator (as well as a piezoelectric),which directly converts mechanical energy into electrochemical energy. Such a SCSPC consists of a nanogenerator, a supercapacitor, and a power-management system, which can be directly used as a power source. The self-charging capability of SCSPC was demonstrated by mechanical deformation under human palm impact. The SCSPC can be charged to 110 mV (aluminum foil) in 300 s under palm impact. In addition,the green light-emitting diode glowed using serially connected SCSPC as the power source. This finding opens up the possibility of making self-powered flexible hybrid electronic devices.