• Energy-harvesting enhancement in composites of microwave-exfoliated KNN and multiwall carbon nanotubes

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    • Keywords


      MWCNT; KNN; KNN–MWCNT harvesters; damping; energy conversion; power density.

    • Abstract


      The objective of this research work is to investigate the effect of multiwall carbon nanotube (MWCNT) content (0.3–1.2 wt%) on a potassium sodium niobate (KNN)-based piezoelectric unimorph harvester for enhancing the energy generation capacity. KNN–MWCNT composites were fabricated by using a microwave solid state technique. The energy-harvesting performance of the KNN–MWCNT composite was determined by the base excitation method and sized to resonate between 20 and 100 Hz at 1 MΩ load resistance. The energy performance of the KNN composite at percolation threshold (0.6 wt% MWCNT) showed a maximum power generation of 2.94 μW, the power density of 7.15 μWm⁻₃ and overall efficiency of 83.75% at an input acceleration of 0.5 g and a load resistance of 1 MΩ. Improvements observed in the power generation by percolation phenomena and ionic flow over the nanotube surface of KNN composites prove to be a boon for low-power sensing devices.

    • Author Affiliations



      1. Department of Mechanical Engineering, BMS Institute of Technology and Management, Bangalore 560064, India
      2. Research and Development Centre, Department of Mechanical Engineering, R.V. College of Engineering, Bangalore 560059, India
    • Dates

  • Bulletin of Materials Science | News

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