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Electrochemically driven mechanical energy harvesting

Author

Listed:
  • Sangtae Kim

    (Massachusetts Institute of Technology)

  • Soon Ju Choi

    (Massachusetts Institute of Technology)

  • Kejie Zhao

    (Massachusetts Institute of Technology)

  • Hui Yang

    (Pennsylvania State University)

  • Giorgia Gobbi

    (Massachusetts Institute of Technology
    Politecnico di Milano)

  • Sulin Zhang

    (Pennsylvania State University)

  • Ju Li

    (Massachusetts Institute of Technology
    Massachusetts Institute of Technology)

Abstract

Efficient mechanical energy harvesters enable various wearable devices and auxiliary energy supply. Here we report a novel class of mechanical energy harvesters via stress–voltage coupling in electrochemically alloyed electrodes. The device consists of two identical Li-alloyed Si as electrodes, separated by electrolyte-soaked polymer membranes. Bending-induced asymmetric stresses generate chemical potential difference, driving lithium ion flux from the compressed to the tensed electrode to generate electrical current. Removing the bending reverses ion flux and electrical current. Our thermodynamic analysis reveals that the ideal energy-harvesting efficiency of this device is dictated by the Poisson’s ratio of the electrodes. For the thin-film-based energy harvester used in this study, the device has achieved a generating capacity of 15%. The device demonstrates a practical use of stress-composition–voltage coupling in electrochemically active alloys to harvest low-grade mechanical energies from various low-frequency motions, such as everyday human activities.

Suggested Citation

  • Sangtae Kim & Soon Ju Choi & Kejie Zhao & Hui Yang & Giorgia Gobbi & Sulin Zhang & Ju Li, 2016. "Electrochemically driven mechanical energy harvesting," Nature Communications, Nature, vol. 7(1), pages 1-7, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10146
    DOI: 10.1038/ncomms10146
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    Cited by:

    1. Kumar, Ajeet & Park, Sung Hoon & Patil, Deepak Rajaram & Hwang, Geon-Tae & Ryu, Jungho, 2022. "Effect of aspect ratio of piezoelectric constituents on the energy harvesting performance of magneto-mechano-electric generators," Energy, Elsevier, vol. 239(PB).
    2. Xue, Weijiang & Chen, Tianwu & Ren, Zhichu & Kim, So Yeon & Chen, Yuming & Zhang, Pengcheng & Zhang, Sulin & Li, Ju, 2020. "Molar-volume asymmetry enabled low-frequency mechanical energy harvesting in electrochemical cells," Applied Energy, Elsevier, vol. 273(C).
    3. Sun, Rujie & Li, Qinyu & Yao, Jianfei & Scarpa, Fabrizio & Rossiter, Jonathan, 2020. "Tunable, multi-modal, and multi-directional vibration energy harvester based on three-dimensional architected metastructures," Applied Energy, Elsevier, vol. 264(C).
    4. Cao, Dong-Xing & Lu, Yi-Ming & Lai, Siu-Kai & Mao, Jia-Jia & Guo, Xiang-Ying & Shen, Yong-Jun, 2022. "A novel soft encapsulated multi-directional and multi-modal piezoelectric vibration energy harvester," Energy, Elsevier, vol. 254(PB).
    5. Hu, Yili & Yi, Zhiran & Dong, Xiaoxue & Mou, Fangxiao & Tian, Yingwei & Yang, Qinghai & Yang, Bin & Liu, Jingquan, 2019. "High power density energy harvester with non-uniform cantilever structure due to high average strain distribution," Energy, Elsevier, vol. 169(C), pages 294-304.
    6. Liu, Huicong & Fu, Hailing & Sun, Lining & Lee, Chengkuo & Yeatman, Eric M., 2021. "Hybrid energy harvesting technology: From materials, structural design, system integration to applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 137(C).

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