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Flexoelectric energy harvesters utilizing controllably wrinkled micro-dielectric film

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  • Su, Shengkai
  • Huang, Huaiwei
  • Zhu, Zheng H.

Abstract

Self-powered electronic devices require energy harvesting systems to support their energy needs, but their energy harvesting efficiency seems still insufficient. In this paper, a flexoelectric energy harvester based on controllable wrinkling mechanism is theoretically proposed to enhance the energy harvesting efficiency. The dielectric film, partly bonded to a pre-stretched substrate, wrinkles after release to achieve controllable wavy shapes. A harmonic cyclic post-stretch is employed to stimulate the generation of electric charges. Meanwhile, an electrode-regrouping technique is resorted to optimize the energy harvesting efficiency. Formulation toward this problem includes both the flexoelectricity and piezoelectricity of dielectrics. Theoretical prediction indicates that electrode-regrouping technique can effectively act to relieve neutralization of the charges induced mainly by flexoelectricity and thus improve the energy harvesting efficiency of FEHs. A larger loading frequency and a lower resistance are preferred to optimize the effective power. The power density of the present FEHs is at least 1 orders of magnitude higher than that of vibrational FEHs under micro-scale. Meanwhile, with the scale shrinking below 100 nm, the energy density of the present FEHs may exceed 104W/m3 which is generally 2–4 orders of magnitude higher than that of most vibrational energy harvesters (including electrostatic, electromagnetic, piezoelectric types).

Suggested Citation

  • Su, Shengkai & Huang, Huaiwei & Zhu, Zheng H., 2021. "Flexoelectric energy harvesters utilizing controllably wrinkled micro-dielectric film," Energy, Elsevier, vol. 224(C).
    • Handle: RePEc:eee:energy:v:224:y:2021:i:c:s0360544221003054
    DOI: 10.1016/j.energy.2021.120056
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    References listed on IDEAS

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    1. Wei, Chongfeng & Jing, Xingjian, 2017. "A comprehensive review on vibration energy harvesting: Modelling and realization," Renewable and Sustainable Energy Reviews, Elsevier, vol. 74(C), pages 1-18.
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