Piezoelectric polymer-based roadway energy harvesting via displacement amplification module. (15th April 2018)

• Record Type: Journal Article
• Authors: Shin, Youn-Hwan; Jung, Inki; Noh, Myoung-Sub; Kim, Jeong Hun; Choi, Ji-Young; Kim, Sangtae; Kang, Chong-Yun
• Is Part Of: Applied energy. Volume 216(2018)
• Page Start: 741
• Page End: 750
• Publication Date: 2018-04-15
• Subjects: Roadway energy harvesting -- Piezoelectricpolymers -- PVDF -- Displacement amplification -- On-site installation study; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2018.02.074
• Languages: English
• ISSNs: 0306-2619

Abstract

Graphical abstract: Highlights: PVDF-based energy harvesting module is demonstrated on local highway in Korea. The module features displacement amplification unit for uninterrupted driving. The power output reaches up to 16 W/m 2 and scales with the speed of the vehicles. The module may also be used as a self-powered speed sensor. Abstract: Recent research efforts show that piezoelectric polymers such as PVDF are competitive alternatives to the conventional piezoelectric ceramics. While possessing extraordinary toughness and fatigue resistance, however, piezoelectric polymers suffer from limited applications due to a large amount of deformation required for high power output. Here, we design and demonstrate a PVDF-based, high-power piezoelectric module installed on a local highway, for the first time. The module contains a bridge-type displacement amplification capability, demonstrating the 2.5 mm vertical displacement converted into 13 mm horizontal deformation, suitable for the uninterrupted driving experience. We provide the design guidelines and optimization strategies for the module, in terms of the piezoelectric power output. With 80 bimorph-shaped energy harvesters, the module achieves up to 16.5 W/m 2 energy density when the test vehicle passes by at 80 km/h. The matching impedance decreases with vehicle speed, suggesting that different matching impedance should be used for highway and local roadways. The output power exhibits a linear relation to the vehicle speed and weight, implying the module's potential application as a self-powered speed sensor. The study demonstrates that PVDF-based energy harvesters provide a competitive power output at small vertical displacements with relevant module design, making the tough piezoelectric materials suitable for efficient and durable roadway energy harvesting.