Determination of the appropriate piezoelectric materials for various types of piezoelectric energy harvesters with high output power. (March 2019)

• Record Type: Journal Article
• Authors: Kim, Sun-Woo; Lee, Tae-Gon; Kim, Dae-Hyeon; Lee, Ku-Tak; Jung, Inki; Kang, Chong-Yun; Han, Seung Ho; Kang, Hyung-Won; Nahm, Sahn
• Is Part Of: Nano energy. Volume 57(2019)
• Page Start: 581
• Page End: 591
• Publication Date: 2019-03
• Subjects: Piezoelectric materials -- PEH -- FOM -- kij -- Qm; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2018.12.082
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: For a type-1 piezoelectric energy harvester (PEH), in which stress develops in the supporting system of the piezoelectric materials, the electromechanical coupling factor ( k ij ) of the piezoelectric materials is important for the output power at the resonance frequency. Therefore, soft-piezoelectric materials are good candidates for these PEHs. For type-2 PEHs, in which stress develops in the piezoelectric material and supporting system, the figure of merit ( FOM ) of the output power at the resonance frequency is ( k ij 2 × Q m )/ s 11 E, where Q m and s 11 E are the mechanical quality factor and the elastic compliance of piezoelectric materials, respectively. In particular, the effect of Q m is very large for these PEHs, indicating that hard-piezoelectric materials are good candidates for type-2 PEHs operating at the resonance frequency. For both type-1 and type-2 PEHs operating at off-resonance frequency, the k ij 2 × d ij × g ij is the FOM of the output power of the PEHs, where g ij is a piezoelectric voltage constant. Therefore, soft-piezoelectric materials are also good candidates for both type-1 and type-2 PEHs operating at the off-resonance frequency. Graphical abstract: fx1 Highlights: Piezoelectric materials for the maximum output power depend on the type of PEH. Soft-piezoelectric materials are good for type-1 PEH at the resonance frequency. Hard-piezoelectric materials are good for type-2 PEH at the resonance frequency. Soft-piezoelectric materials are good for PEH at the off-resonance frequency.