A sustainable freestanding biomechanical energy harvesting smart backpack as a portable-wearable power source†
Arunkumar Chandrasekhar,a Nagamalleswara Rao Alluri,b Venkateswaran Vivekananthan,
a Yuvasree Purusothamana and Sang-Jae Kim*ab
Wearable gadgets have attracted consumer attention, resulting in an abundance of research on the
development of self-powered devices. Recently, triboelectric nanogenerators (TENGs) have been shown
to be an effective approach for scavenging biomechanical energy. An innovative, cost-effective and
eco-friendly freestanding smart backpack-triboelectric nanogenerator (SBP-TENG) is presented for
scavenging biomechanical energy. A new approach to creating irregular surfaces on a polydimethylsiloxane
(PDMS) film is demonstrated by recycling a plastic Petri dish discarded after laboratory usage.
The SBP-TENG relies on contact and separation electrification between the PDMS film and contact
materials (wool, paper, cotton, denim and polyethylene). The performance of single- and multi-unit
SBP-TENGs is systematically studied and real-time energy harvesting from human motions, such as
walking, running and bending, is demonstrated. This study confirms that the SBP-TENG is an excellent
technology for scavenging biomechanical energy, capable of driving a variety of low-power electronic
devices such as global positioning system (GPS) sensors, wearable sensors and flashlights.